Updating configure.ac with new version number

[maxima/cygwin.git] / lisp-utils / defsystem.lisp

;;; -*- Mode: Lisp; Package: make -*-
;;; -*- Mode: CLtL; Syntax: Common-Lisp -*-

;;; DEFSYSTEM 3.4 Interim 3.

;;; defsystem.lisp --

;;; ****************************************************************
;;; MAKE -- A Portable Defsystem Implementation ********************
;;; ****************************************************************

;;; This is a portable system definition facility for Common Lisp.
;;; Though home-grown, the syntax was inspired by fond memories of the
;;; defsystem facility on Symbolics 3600's. The exhaustive lists of
;;; filename extensions for various lisps and the idea to have one
;;; "operate-on-system" function instead of separate "compile-system"
;;; and "load-system" functions were taken from Xerox Corp.'s PCL
;;; system.

;;; This system improves on both PCL and Symbolics defsystem utilities
;;; by performing a topological sort of the graph of file-dependency
;;; constraints. Thus, the components of the system need not be listed
;;; in any special order, because the defsystem command reorganizes them
;;; based on their constraints. It includes all the standard bells and
;;; whistles, such as not recompiling a binary file that is up to date
;;; (unless the user specifies that all files should be recompiled).

;;; Originally written by Mark Kantrowitz, School of Computer Science,
;;; Carnegie Mellon University, October 1989.

;;; MK:DEFSYSTEM 3.4 Interim 3
;;;
;;; Copyright (c) 1989 - 1999 Mark Kantrowitz. All rights reserved.
;;;               1999 - 2004 Mark Kantrowitz and Marco Antoniotti. All
;;;                           rights reserved.

;;; Use, copying, modification, merging, publishing, distribution
;;; and/or sale of this software, source and/or binary files and
;;; associated documentation files (the "Software") and of derivative
;;; works based upon this Software are permitted, as long as the
;;; following conditions are met:

;;;    o this copyright notice is included intact and is prominently
;;;      visible in the Software
;;;    o if modifications have been made to the source code of the
;;;      this package that have not been adopted for inclusion in the
;;;      official version of the Software as maintained by the Copyright
;;;      holders, then the modified package MUST CLEARLY identify that
;;;      such package is a non-standard and non-official version of
;;;      the Software.  Furthermore, it is strongly encouraged that any
;;;      modifications made to the Software be sent via e-mail to the
;;;      MK-DEFSYSTEM maintainers for consideration of inclusion in the
;;;      official MK-DEFSYSTEM package.

;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;; EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
;;; IN NO EVENT SHALL M. KANTROWITZ AND M. ANTONIOTTI BE LIABLE FOR ANY
;;; CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
;;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
;;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

;;; Except as contained in this notice, the names of M. Kantrowitz and
;;; M. Antoniotti shall not be used in advertising or otherwise to promote
;;; the sale, use or other dealings in this Software without prior written
;;; authorization from M. Kantrowitz and M. Antoniotti.


;;; Please send bug reports, comments and suggestions to <marcoxa@cons.org>.
\f
;;; ********************************
;;; Change Log *********************
;;; ********************************
;;;
;;; Note: Several of the fixes from 30-JAN-91 and 31-JAN-91 were done in
;;; September and October 1990, but not documented until January 1991.
;;;
;;; akd  = Abdel Kader Diagne <diagne@dfki.uni-sb.de>
;;; as   = Andreas Stolcke <stolcke@ICSI.Berkeley.EDU>
;;; bha  = Brian Anderson <bha@atc.boeing.com>
;;; brad = Brad Miller <miller@cs.rochester.edu>
;;; bw   = Robert Wilhelm <wilhelm@rpal.rockwell.com>
;;; djc  = Daniel J. Clancy <clancy@cs.utexas.edu>
;;; fdmm = Fernando D. Mato Mira <matomira@di.epfl.ch>
;;; gc   = Guillaume Cartier <cartier@math.uqam.ca>
;;; gi   = Gabriel Inaebnit <inaebnit@research.abb.ch>
;;; gpw  = George Williams <george@hsvaic.boeing.com>
;;; hkt  = Rick Taube <hkt@cm-next-8.stanford.edu>
;;; ik   = Ik Su Yoo <ik@ctt.bellcore.com>
;;; jk   = John_Kolojejchick@MORK.CIMDS.RI.CMU.EDU
;;; kt   = Kevin Thompson <kthompso@ptolemy.arc.nasa.gov>
;;; kc   = Kaelin Colclasure <kaelin@bridge.com>
;;; kmr  = Kevin M. Rosenberg <kevin@rosenberg.net>
;;; lmh  = Liam M. Healy <Liam.Healy@nrl.navy.mil>
;;; mc   = Matthew Cornell <cornell@unix1.cs.umass.edu>
;;; oc   = Oliver Christ <oli@adler.ims.uni-stuttgart.de>
;;; rs   = Ralph P. Sobek <ralph@vega.laas.fr>
;;; rs2  = Richard Segal <segal@cs.washington.edu>
;;; sb   = Sean Boisen <sboisen@bbn.com>
;;; ss   = Steve Strassman <straz@cambridge.apple.com>
;;; tar  = Thomas A. Russ <tar@isi.edu>
;;; toni = Anton Beschta <toni%l4@ztivax.siemens.com>
;;; yc   = Yang Chen <yangchen%iris.usc.edu@usc.edu>
;;;
;;; Thanks to Steve Strassmann <straz@media-lab.media.mit.edu> and
;;; Sean Boisen <sboisen@BBN.COM> for detailed bug reports and
;;; miscellaneous assistance. Thanks also to Gabriel Inaebnit
;;; <inaebnit@research.abb.ch> for help with VAXLisp bugs.
;;;
;;; 05-NOV-90  hkt  Changed canonicalize-system-name to make system
;;;                 names package independent. Interns them in the
;;;                 keyword package. Thus either strings or symbols may
;;;                 be used to name systems from the user's point of view.
;;; 05-NOV-90  hkt  Added definition FIND-SYSTEM to allow OOS to
;;;                 work on systems whose definition hasn't been loaded yet.
;;; 05-NOV-90  hkt  Added definitions COMPILE-SYSTEM and LOAD-SYSTEM
;;;                 as alternates to OOS for naive users.
;;; 05-NOV-90  hkt  Shadowing-import of 'defsystem in Allegro CL 3.1 [NeXT]
;;;                 into USER package instead of import.
;;; 15-NOV-90  mk   Changed package name to "MAKE", eliminating "DEFSYSTEM"
;;;                 to avoid conflicts with allegro, symbolics packages
;;;                 named "DEFSYSTEM".
;;; 30-JAN-91  mk   Modified append-directories to work with the
;;;                 logical-pathnames system.
;;; 30-JAN-91  mk   Append-directories now works with Sun CL4.0. Also, fixed
;;;                 bug wrt Lucid 4.0's pathnames (which changed from lcl3.0
;;;                 -- 4.0 uses a list for the directory slot, whereas
;;;                 3.0 required a string). Possible fix to symbolics bug.
;;; 30-JAN-91  mk   Defined NEW-REQUIRE to make redefinition of REQUIRE
;;;                 cleaner. Replaced all calls to REQUIRE in this file with
;;;                 calls to NEW-REQUIRE, which should avoid compiler warnings.
;;; 30-JAN-91  mk   In VAXLisp, when we redefine lisp:require, the compiler
;;;                 no longer automatically executes require forms when it
;;;                 encounters them in a file. The user can always wrap an
;;;                 (eval-when (compile load eval) ...) around the require
;;;                 form. Alternately, see commented out code near the
;;;                 redefinition of lisp:require which redefines it as a
;;;                 macro instead.
;;; 30-JAN-91  mk   Added parameter :version to operate-on-system. If it is
;;;                 a number, that number is used as part of the binary
;;;                 directory name as the place to store and load files.
;;;                 If NIL (the default), uses regular binary directory.
;;;                 If T, tries to find the most recent version of the
;;;                 binary directory.
;;; 30-JAN-91  mk   Added global variable *use-timeouts* (default: t), which
;;;                 specifies whether timeouts should be used in
;;;                 Y-OR-N-P-WAIT. This is provided for users whose lisps
;;;                 don't handle read-char-no-hang properly, so that they
;;;                 can set it to NIL to disable the timeouts. Usually the
;;;                 reason for this is the lisp is run on top of UNIX,
;;;                 which buffers input LINES (and provides input editing).
;;;                 To get around this we could always turn CBREAK mode
;;;                 on and off, but there's no way to do this in a portable
;;;                 manner.
;;; 30-JAN-91  mk   Fixed bug where in :test t mode it was actually providing
;;;                 the system, instead of faking it.
;;; 30-JAN-91  mk   Changed storage of system definitions to a hash table.
;;;                 Changed canonicalize-system-name to coerce the system
;;;                 names to uppercase strings. Since we're no longer using
;;;                 get, there's no need to intern the names as symbols,
;;;                 and strings don't have packages to cause problems.
;;;                 Added UNDEFSYSTEM, DEFINED-SYSTEMS, and DESCRIBE-SYSTEM.
;;;                 Added :delete-binaries command.
;;; 31-JAN-91  mk   Franz Allegro CL has a defsystem in the USER package,
;;;                 so we need to do a shadowing import to avoid name
;;;                 conflicts.
;;; 31-JAN-91  mk   Fixed bug in compile-and-load-operation where it was
;;;                 only loading newly compiled files.
;;; 31-JAN-91  mk   Added :load-time slot to components to record the
;;;                 file-write-date of the binary/source file that was loaded.
;;;                 Now knows "when" (which date version) the file was loaded.
;;;                 Added keyword :minimal-load and global *minimal-load*
;;;                 to enable defsystem to avoid reloading unmodified files.
;;;                 Note that if B depends on A, but A is up to date and
;;;                 loaded and the user specified :minimal-load T, then A
;;;                 will not be loaded even if B needs to be compiled. So
;;;                 if A is an initializations file, say, then the user should
;;;                 not specify :minimal-load T.
;;; 31-JAN-91  mk   Added :load-only slot to components. If this slot is
;;;                 specified as non-NIL, skips over any attempts to compile
;;;                 the files in the component. (Loading the file satisfies
;;;                 the need to recompile.)
;;; 31-JAN-91  mk   Eliminated use of set-alist-lookup and alist-lookup,
;;;                 replacing it with hash tables. It was too much bother,
;;;                 and rather brittle too.
;;; 31-JAN-91  mk   Defined #@ macro character for use with AFS @sys
;;;                 feature simulator. #@"directory" is then synonymous
;;;                 with (afs-binary-directory "directory").
;;; 31-JAN-91  mk   Added :private-file type of module. It is similar to
;;;                 :file, but has an absolute pathname. This allows you
;;;                 to specify a different version of a file in a system
;;;                 (e.g., if you're working on the file in your home
;;;                 directory) without completely rewriting the system
;;;                 definition.
;;; 31-JAN-91  mk   Operations on systems, such as :compile and :load,
;;;                 now propagate to subsystems the system depends on
;;;                 if *operations-propagate-to-subsystems* is T (the default)
;;;                 and the systems were defined using either defsystem
;;;                 or as a :system component of another system. Thus if
;;;                 a system depends on another, it can now recompile the
;;;                 other.
;;; 01-FEB-91  mk   Added default definitions of PROVIDE/REQUIRE/*MODULES*
;;;                 for lisps that have thrown away these definitions in
;;;                 accordance with CLtL2.
;;; 01-FEB-91  mk   Added :compile-only slot to components. Analogous to
;;;                 :load-only. If :compile-only is T, will not load the
;;;                 file on operation :compile. Either compiles or loads
;;;                 the file, but not both. In other words, compiling the
;;;                 file satisfies the demand to load it. This is useful
;;;                 for PCL defmethod and defclass definitions, which wrap
;;;                 an (eval-when (compile load eval) ...) around the body
;;;                 of the definition -- we save time by not loading the
;;;                 compiled code, since the eval-when forces it to be
;;;                 loaded. Note that this may not be entirely safe, since
;;;                 CLtL2 has added a :load keyword to compile-file, and
;;;                 some lisps may maintain a separate environment for
;;;                 the compiler. This feature is for the person who asked
;;;                 that a :COMPILE-SATISFIES-LOAD keyword be added to
;;;                 modules. It's named :COMPILE-ONLY instead to match
;;;                 :LOAD-ONLY.
;;; 11-FEB-91  mk   Now adds :mk-defsystem to features list, to allow
;;;                 special cased loading of defsystem if not already
;;;                 present.
;;; 19-FEB-91  duff Added filename extension for hp9000/300's running Lucid.
;;; 26-FEB-91  mk   Distinguish between toplevel systems (defined with
;;;                 defsystem) and systems defined as a :system module
;;;                 of a defsystem. The former can depend only on systems,
;;;                 while the latter can depend on anything at the same
;;;                 level.
;;; 12-MAR-91  mk   Added :subsystem component type to be a system with
;;;                 pathnames relative to its parent component.
;;; 12-MAR-91  mk   Uncommented :device :absolute for CMU pathnames, so
;;;                 that the leading slash is included.
;;; 12-MAR-91  brad Patches for Allegro 4.0.1 on Sparc.
;;; 12-MAR-91  mk   Changed definition of format-justified-string so that
;;;                 it no longer depends on the ~<~> format directives,
;;;                 because Allegro 4.0.1 has a bug which doesn't support
;;;                 them. Anyway, the new definition is twice as fast
;;;                 and conses half as much as FORMAT.
;;; 12-MAR-91 toni  Remove nils from list in expand-component-components.
;;; 12-MAR-91 bw    If the default-package and system have the same name,
;;;                 and the package is not loaded, this could lead to
;;;                 infinite loops, so we bomb out with an error.
;;;                 Fixed bug in default packages.
;;; 13-MAR-91 mk    Added global *providing-blocks-load-propagation* to
;;;                 control whether system dependencies are loaded if they
;;;                 have already been provided.
;;; 13-MAR-91 brad  In-package is a macro in CLtL2 lisps, so we change
;;;                 the package manually in operate-on-component.
;;; 15-MAR-91 mk    Modified *central-registry* to be either a single
;;;                 directory pathname, or a list of directory pathnames
;;;                 to be checked in order.
;;; 15-MAR-91 rs    Added afs-source-directory to handle versions when
;;;                 compiling C code under lisp. Other minor changes to
;;;                 translate-version and operate-on-system.
;;; 21-MAR-91 gi    Fixed bug in defined-systems.
;;; 22-MAR-91 mk    Replaced append-directories with new version that works
;;;                 by actually appending the directories, after massaging
;;;                 them into the proper format. This should work for all
;;;                 CLtL2-compliant lisps.
;;; 09-APR-91 djc   Missing package prefix for lp:pathname-host-type.
;;;                 Modified component-full-pathname to work for logical
;;;                 pathnames.
;;; 09-APR-91 mk    Added *dont-redefine-require* to control whether
;;;                 REQUIRE is redefined. Fixed minor bugs in redefinition
;;;                 of require.
;;; 12-APR-91 mk    (pathname-host nil) causes an error in MCL 2.0b1
;;; 12-APR-91 mc    Ported to MCL2.0b1.
;;; 16-APR-91 mk    Fixed bug in needs-loading where load-time and
;;;                 file-write-date got swapped.
;;; 16-APR-91 mk    If the component is load-only, defsystem shouldn't
;;;                 tell you that there is no binary and ask you if you
;;;                 want to load the source.
;;; 17-APR-91 mc    Two additional operations for MCL.
;;; 21-APR-91 mk    Added feature requested by ik. *files-missing-is-an-error*
;;;                 new global variable which controls whether files (source
;;;                 and binary) missing cause a continuable error or just a
;;;                 warning.
;;; 21-APR-91 mk    Modified load-file-operation to allow compilation of source
;;;                 files during load if the binary files are old or
;;;                 non-existent. This adds a :compile-during-load keyword to
;;;                 oos, and load-system. Global *compile-during-load* sets
;;;                 the default (currently :query).
;;; 21-APR-91 mk    Modified find-system so that there is a preference for
;;;                 loading system files from disk, even if the system is
;;;                 already defined in the environment.
;;; 25-APR-91 mk    Removed load-time slot from component defstruct and added
;;;                 function COMPONENT-LOAD-TIME to store the load times in a
;;;                 hash table. This is safer than the old definition because
;;;                 it doesn't wipe out load times every time the system is
;;;                 redefined.
;;; 25-APR-91 mk    Completely rewrote load-file-operation. Fixed some bugs
;;;                 in :compile-during-load and in the behavior of defsystem
;;;                 when multiple users are compiling and loading a system
;;;                 instead of just a single user.
;;; 16-MAY-91 mk    Modified FIND-SYSTEM to do the right thing if the system
;;;                 definition file cannot be found.
;;; 16-MAY-91 mk    Added globals *source-pathname-default* and
;;;                 *binary-pathname-default* to contain default values for
;;;                 :source-pathname and :binary-pathname. For example, set
;;;                 *source-pathname-default* to "" to avoid having to type
;;;                 :source-pathname "" all the time.
;;; 27-MAY-91 mk    Fixed bug in new-append-directories where directory
;;;                 components of the form "foo4.0" would appear as "foo4",
;;;                 since pathname-name truncates the type. Changed
;;;                 pathname-name to file-namestring.
;;;  3-JUN-91 gc    Small bug in new-append-directories; replace (when
;;;                 abs-name) with (when (not (null-string abs-name)))
;;;  4-JUN-91 mk    Additional small change to new-append-directories for
;;;                 getting the device from the relative pname if the abs
;;;                 pname is "". This is to fix a small behavior in CMU CL old
;;;                 compiler. Also changed (when (not (null-string abs-name)))
;;;                 to have an (and abs-name) in there.
;;;  8-JAN-92 sb    Added filename extension for defsystem under Lucid Common
;;;                 Lisp/SGO 3.0.1+.
;;;  8-JAN-92 mk    Changed the definition of prompt-string to work around an
;;;                 AKCL bug. Essentially, AKCL doesn't default the colinc to
;;;                 1 if the colnum is provided, so we hard code it.
;;;  8-JAN-92 rs    (pathname-directory (pathname "")) returns '(:relative) in
;;;                 Lucid, instead of NIL. Changed new-append-directories and
;;;                 test-new-append-directories to reflect this.
;;;  8-JAN-92 mk    Fixed problem related to *load-source-if-no-binary*.
;;;                 compile-and-load-source-if-no-binary wasn't checking for
;;;                 the existence of the binary if this variable was true,
;;;                 causing the file to not be compiled.
;;;  8-JAN-92 mk    Fixed problem with null-string being called on a pathname
;;;                 by returning NIL if the argument isn't a string.
;;;  3-NOV-93 mk    In Allegro 4.2, pathname device is :unspecific by default.
;;; 11-NOV-93 fdmm  Fixed package definition lock problem when redefining
;;;                 REQUIRE on ACL.
;;; 11-NOV-93 fdmm  Added machine and software types for SGI and IRIX. It is
;;;                 important to distinguish the OS version and CPU type in
;;;                 SGI+ACL, since ACL 4.1 on IRIX 4.x and ACL 4.2 on IRIX 5.x
;;;                 have incompatible .fasl files.
;;; 01-APR-94 fdmm  Fixed warning problem when redefining REQUIRE on LispWorks.
;;; 01-NOV-94 fdmm  Replaced (software-type) call in ACL by code extracting
;;;                 the interesting parts from (software-version) [deleted
;;;                 machine name and id].
;;; 03-NOV-94 fdmm  Added a hook (*compile-file-function*), that is funcalled
;;;                 by compile-file-operation, so as to support other languages
;;;                 running on top of Common Lisp.
;;;                 The default is to compile  Common Lisp.
;;; 03-NOV-94 fdmm  Added SCHEME-COMPILE-FILE, so that defsystem can now
;;;                 compile Pseudoscheme files.
;;; 04-NOV-94 fdmm  Added the exported generic function SET-LANGUAGE, to
;;;                 have a clean, easy to extend  interface for telling
;;;                 defsystem which language to assume for compilation.
;;;                 Currently supported arguments: :common-lisp, :scheme.
;;; 11-NOV-94 kc    Ported to Allegro CL for Windows 2.0 (ACLPC) and CLISP.
;;; 18-NOV-94 fdmm  Changed the entry *filename-extensions* for LispWorks
;;;                 to support any platform.
;;;                 Added entries for :mcl and :clisp too.
;;; 16-DEC-94 fdmm  Added and entry for CMU CL on SGI to *filename-extensions*.
;;; 16-DEC-94 fdmm  Added OS version identification for CMU CL on SGI.
;;; 16-DEC-94 fdmm  For CMU CL 17 : Bypassed make-pathnames call fix
;;;                 in NEW-APPEND-DIRECTORIES.
;;; 16-DEC-94 fdmm  Added HOME-SUBDIRECTORY to fix CMU's ignorance about `~'
;;;                 when specifying registries.
;;; 16-DEC-94 fdmm  For CMU CL 17 : Bypassed :device fix in make-pathnames call
;;;                 in COMPONENT-FULL-PATHNAME. This fix was also reported
;;;                 by kc on 12-NOV-94. CMU CL 17 now supports CLtL2 pathnames.
;;; 16-DEC-94 fdmm  Removed a quote before the call to read in the readmacro
;;;                 #@. This fixes a really annoying misfeature (couldn't do
;;;                 #@(concatenate 'string "foo/" "bar"), for example).
;;; 03-JAN-95 fdmm  Do not include :pcl in *features* if :clos is there.
;;;  2-MAR-95 mk    Modified fdmm's *central-registry* change to use
;;;                 user-homedir-pathname and to be a bit more generic in the
;;;                 pathnames.
;;;  2-MAR-95 mk    Modified fdmm's updates to *filename-extensions* to handle
;;;                 any CMU CL binary extensions.
;;;  2-MAR-95 mk    Make kc's port to ACLPC a little more generic.
;;;  2-MAR-95 mk    djc reported a bug, in which GET-SYSTEM was not returning
;;;                 a system despite the system's just having been loaded.
;;;                 The system name specified in the :depends-on was a
;;;                 lowercase string. I am assuming that the system name
;;;                 in the defsystem form was a symbol (I haven't verified
;;;                 that this was the case with djc, but it is the only
;;;                 reasonable conclusion). So, CANONICALIZE-SYSTEM-NAME
;;;                 was storing the system in the hash table as an
;;;                 uppercase string, but attempting to retrieve it as a
;;;                 lowercase string. This behavior actually isn't a bug,
;;;                 but a user error. It was intended as a feature to
;;;                 allow users to use strings for system names when
;;;                 they wanted to distinguish between two different systems
;;;                 named "foo.system" and "Foo.system". However, this
;;;                 user error indicates that this was a bad design decision.
;;;                 Accordingly, CANONICALIZE-SYSTEM-NAME now uppercases
;;;                 even strings for retrieving systems, and the comparison
;;;                 in *modules* is now case-insensitive. The result of
;;;                 this change is if the user cannot have distinct
;;;                 systems in "Foo.system" and "foo.system" named "Foo" and
;;;                 "foo", because they will clobber each other. There is
;;;                 still case-sensitivity on the filenames (i.e., if the
;;;                 system file is named "Foo.system" and you use "foo" in
;;;                 the :depends-on, it won't find it). We didn't take the
;;;                 further step of requiring system filenames to be lowercase
;;;                 because we actually find this kind of case-sensitivity
;;;                 to be useful, when maintaining two different versions
;;;                 of the same system.
;;;  7-MAR-95 mk    Added simplistic handling of logical pathnames. Also
;;;                 modified new-append-directories so that it'll try to
;;;                 split up pathname directories that are strings into a
;;;                 list of the directory components. Such directories aren't
;;;                 ANSI CL, but some non-conforming implementations do it.
;;;  7-MAR-95 mk    Added :proclamations to defsystem form, which can be used
;;;                 to set the compiler optimization level before compilation.
;;;                 For example,
;;;                  :proclamations '(optimize (safety 3) (speed 3) (space 0))
;;;  7-MAR-95 mk    Defsystem now tells the user when it reloads the system
;;;                 definition.
;;;  7-MAR-95 mk    Fixed problem pointed out by yc. If
;;;                 *source-pathname-default* is "" and there is no explicit
;;;                 :source-pathname specified for a file, the file could
;;;                 wind up with an empty file name. In other words, this
;;;                 global default shouldn't apply to :file components. Added
;;;                 explicit test for null strings, and when present replaced
;;;                 them with NIL (for binary as well as source, and also for
;;;                 :private-file components).
;;;  7-MAR-95 tar   Fixed defsystem to work on TI Explorers (TI CL).
;;;  7-MAR-95 jk    Added machine-type-translation for Decstation 5000/200
;;;                 under Allegro 3.1
;;;  7-MAR-95 as    Fixed bug in AKCL-1-615 in which defsystem added a
;;;                 subdirectory "RELATIVE" to all filenames.
;;;  7-MAR-95 mk    Added new test to test-new-append-directories to catch the
;;;                 error fixed by as. Essentially, this error occurs when the
;;;                 absolute-pathname has no directory (i.e., it has a single
;;;                 pathname component as in "foo" and not "foo/bar"). If
;;;                 RELATIVE ever shows up in the Result, we now know to
;;;                 add an extra conditionalization to prevent abs-keyword
;;;                 from being set to :relative.
;;;  7-MAR-95 ss    Miscellaneous fixes for MCL 2.0 final.
;;;                 *compile-file-verbose* not in MCL, *version variables
;;;                 need to occur before AFS-SOURCE-DIRECTORY definition,
;;;                 and certain code needed to be in the CCL: package.
;;;  8-MAR-95 mk    Y-OR-N-P-WAIT uses a busy-waiting. On Lisp systems where
;;;                 the time functions cons, such as CMU CL, this can cause a
;;;                 lot of ugly garbage collection messages. Modified the
;;;                 waiting to include calls to SLEEP, which should reduce
;;;                 some of the consing.
;;;  8-MAR-95 mk    Replaced fdmm's SET-LANGUAGE enhancement with a more
;;;                 general extension, along the lines suggested by akd.
;;;                 Defsystem now allows components to specify a :language
;;;                 slot, such as :language :lisp, :language :scheme. This
;;;                 slot is inherited (with the default being :lisp), and is
;;;                 used to obtain compilation and loading functions for
;;;                 components, as well as source and binary extensions. The
;;;                 compilation and loading functions can be overridden by
;;;                 specifying a :compiler or :loader in the system
;;;                 definition. Also added :documentation slot to the system
;;;                 definition.
;;;                    Where this comes in real handy is if one has a
;;;                 compiler-compiler implemented in Lisp, and wants the
;;;                 system to use the compiler-compiler to create a parser
;;;                 from a grammar and then compile parser. To do this one
;;;                 would create a module with components that looked
;;;                 something like this:
;;;               ((:module cc :components ("compiler-compiler"))
;;;                (:module gr :compiler 'cc :loader #'ignore
;;;                         :source-extension "gra"
;;;                         :binary-extension "lisp"
;;;                         :depends-on (cc)
;;;                         :components ("sample-grammar"))
;;;                (:module parser :depends-on (gr)
;;;                         :components ("sample-grammar")))
;;;                 Defsystem would then compile and load the compiler, use
;;;                 it (the function cc) to compile the grammar into a parser,
;;;                 and then compile the parser. The only tricky part is
;;;                 cc is defined by the system, and one can't include #'cc
;;;                 in the system definition. However, one could include
;;;                 a call to mk:define-language in the compiler-compiler file,
;;;                 and define :cc as a language. This is the prefered method.
;;;  8-MAR-95 mk    New definition of topological-sort suggested by rs2. This
;;;                 version avoids the call to SORT, but in practice isn't
;;;                 much faster. However, it avoids the need to maintain a
;;;                 TIME slot in the topsort-node structure.
;;;  8-MAR-95 mk    rs2 also pointed out that the calls to MAKE-PATHNAME and
;;;                 NAMESTRING in COMPONENT-FULL-PATHNAME are a major reason
;;;                 why defsystem is slow. Accordingly, I've changed
;;;                 COMPONENT-FULL-PATHNAME to include a call to NAMESTRING
;;;                 (and removed all other calls to NAMESTRING), and also made
;;;                 a few changes to minimize the number of calls to
;;;                 COMPONENT-FULL-PATHNAME, such as memoizing it. See To Do
;;;                 below for other related comments.
;;;  8-MAR-95 mk    Added special hack requested by Steve Strassman, which
;;;                 allows one to specify absolute pathnames in the shorthand
;;;                 for a list of components, and have defsystem recognize
;;;                 which are absolute and which are relative.
;;;                 I actually think this would be a good idea, but I haven't
;;;                 tested it, so it is disabled by default. Search for
;;;                 *enable-straz-absolute-string-hack* to enable it.
;;;  8-MAR-95 kt    Fixed problem with EXPORT in AKCL 1.603, in which it wasn't
;;;                 properly exporting the value of the global export
;;;                 variables.
;;;  8-MAR-95 mk    Added UNMUNGE-LUCID to fix nasty problem with COMPILE-FILE
;;;                 in Lucid. Lucid apparently tries to merge the :output-file
;;;                 with the source file when the :output-file is a relative
;;;                 pathname. Wierd, and definitely non-standard.
;;;  9-MAR-95 mk    Changed ALLEGRO-MAKE-SYSTEM-FASL to also include the files
;;;                 in any systems the system depends on, as per a
;;;                 request of oc.
;;;  9-MAR-95 mk    Some version of CMU CL couldn't hack a call to
;;;                 MAKE-PATHNAME with :host NIL. I'm not sure which version
;;;                 it is, but the current version doesn't have this problem.
;;;                 If given :host nil, it defaults the host to
;;;                 COMMON-LISP::*UNIX-HOST*. So I haven't "fixed" this
;;;                 problem.
;;;  9-MAR-95 mk    Integrated top-level commands for Allegro designed by bha
;;;                 into the code, with slight modifications.
;;;  9-MAR-95 mk    Instead of having COMPUTE-SYSTEM-PATH check the current
;;;                 directory in a hard-coded fashion, include the current
;;;                 directory in the *central-registry*, as suggested by
;;;                 bha and others.
;;;  9-MAR-95 bha   Support for Logical Pathnames in Allegro.
;;;  9-MAR-95 mk    Added modified version of bha's DEFSYSPATH idea.
;;; 13-MAR-95 mk    Added a macro for the simple serial case, where a system
;;;                 (or module) is simple a list of files, each of which
;;;                 depends on the previous one. If the value of :components
;;;                 is a list beginning with :serial, it expands each
;;;                 component and makes it depend on the previous component.
;;;                 For example, (:serial "foo" "bar" "baz") would create a
;;;                 set of components where "baz" depended on "bar" and "bar"
;;;                 on "foo".
;;; 13-MAR-95 mk    *** Now version 3.0. This version is a interim bug-fix and
;;;                 update, since I do not have the time right now to complete
;;;                 the complete overhaul and redesign.
;;;                 Major changes in 3.0 include CMU CL 17, CLISP, ACLPC, TI,
;;;                 LispWorks and ACL(SGI) support, bug fixes for ACL 4.1/4.2.
;;; 14-MAR-95 fdmm  Finally added the bit of code to discriminate cleanly
;;;                 among different lisps without relying on (software-version)
;;;                 idiosyncracies.
;;;                 You can now customize COMPILER-TYPE-TRANSLATION so that
;;;                 AFS-BINARY-DIRECTORY can return a different value for
;;;                 different lisps on the same platform.
;;;                 If you use only one compiler, do not care about supporting
;;;                 code for multiple versions of it, and want less verbose
;;;                 directory names, just set *MULTIPLE-LISP-SUPPORT* to nil.
;;; 17-MAR-95 lmh   Added EVAL-WHEN for one of the MAKE-PACKAGE calls.
;;;                 CMU CL's RUN-PROGRAM is in the extensions package.
;;;                 ABSOLUTE-FILE-NAMESTRING-P was missing :test keyword
;;;                 Rearranged conditionalization in DIRECTORY-TO-LIST to
;;;                 suppress compiler warnings in CMU CL.
;;; 17-MAR-95 mk    Added conditionalizations to avoid certain CMU CL compiler
;;;                 warnings reported by lmh.
;;; 19990610  ma    Added shadowing of 'HARDCOPY-SYSTEM' for LW Personal Ed.

;;; 19991211  ma    NEW VERSION 4.0 started.
;;; 19991211  ma    Merged in changes requested by T. Russ of
;;;                 ISI. Please refer to the special "ISI" comments to
;;;                 understand these changes
;;; 20000228 ma     The symbols FIND-SYSTEM, LOAD-SYSTEM, DEFSYSTEM,
;;;                 COMPILE-SYSTEM and HARDCOPY-SYSTEM are no longer
;;;                 imported in the COMMON-LISP-USER package.
;;;                 Cfr. the definitions of *EXPORTS* and
;;;                 *SPECIAL-EXPORTS*.
;;; 2000-07-21 rlt  Add COMPILER-OPTIONS to defstruct to allow user to
;;;                 specify special compiler options for a particular
;;;                 component.
;;; 2002-01-08 kmr  Changed allegro symbols to lowercase to support
;;;                 case-sensitive images

;;;---------------------------------------------------------------------------
;;; ISI Comments
;;;
;;; 19991211 Marco Antoniotti
;;; These comments come from the "ISI Branch".  I believe I did
;;; include the :load-always extension correctly.  The other commets
;;; seem superseded by other changes made to the system in the
;;; following years.  Some others are now useless with newer systems
;;; (e.g. filename truncation for new Windows based CL
;;; implementations.)

;;;  1-OCT-92 tar   Fixed problem with TI Lisp machines and append-directory.
;;;  1-OCT-92 tar   Made major modifications to compile-file-operation and
;;;                 load-file-operation to reduce the number of probe-file
;;;                 and write-date inquiries.  This makes the system run much
;;;                 faster through slow network connections.
;;; 13-OCT-92 tar   Added :load-always slot to components. If this slot is
;;;                 specified as non-NIL, always loads the component.
;;;                 This does not trigger dependent compilation.
;;;                 (This can be useful when macro definitions needed
;;;                 during compilation are changed by later files.  In
;;;                 this case, not reloading up-to-date files can
;;;                 cause different results.)
;;; 28-OCT-93 tar   Allegro 4.2 causes an error on (pathname-device nil)
;;; 14-SEP-94 tar   Disable importing of symbols into (CL-)USER package
;;;                 to minimize conflicts with other defsystem utilities.
;;; 10-NOV-94 tar   Added filename truncation code to support Franz Allegro
;;;                 PC with it's 8 character filename limitation.
;;; 15-MAY-98 tar   Changed host attribute for pathnames to support LispWorks
;;;                 (Windows) pathnames which reference other Drives.  Also
;;;                 updated file name convention.
;;;  9-NOV-98 tar   Updated new-append-directories for Lucid 5.0
;;;

\f
;;; ********************************
;;; Ports **************************
;;; ********************************
;;;
;;;    DEFSYSTEM has been tested (successfully) in the following lisps:
;;;       CMU Common Lisp (M2.9 15-Aug-90, Compiler M1.8 15-Aug-90)
;;;       CMU Common Lisp (14-Dec-90 beta, Python Compiler 0.0 PMAX/Mach)
;;;       CMU Common Lisp 17f (Python 1.0)
;;;       Franz Allegro Common Lisp 3.1.12 (ExCL 3/30/90)
;;;       Franz Allegro Common Lisp 4.0/4.1/4.2
;;;       Franz Allegro Common Lisp for Windows (2.0)
;;;       Lucid Common Lisp (Version 2.1 6-DEC-87)
;;;       Lucid Common Lisp (3.0 [SPARC,SUN3])
;;;       Lucid Common Lisp (4.0 [SPARC,SUN3])
;;;       VAXLisp (v2.2) [VAX/VMS]
;;;       VAXLisp (v3.1)
;;;       Harlequin LispWorks
;;;       CLISP (CLISP3 [SPARC])
;;;       Symbolics XL12000 (Genera 8.3)
;;;       Scieneer Common Lisp (SCL) 1.1
;;;       Macintosh Common Lisp
;;;       ECL
;;;
;;;    DEFSYSTEM needs to be tested in the following lisps:
;;;       OpenMCL
;;;       Symbolics Common Lisp (8.0)
;;;       KCL (June 3, 1987 or later)
;;;       AKCL (1.86, June 30, 1987 or later)
;;;       TI (Release 4.1 or later)
;;;       Ibuki Common Lisp (01/01, October 15, 1987)
;;;       Golden Common Lisp (3.1 IBM-PC)
;;;       HP Common Lisp (same as Lucid?)
;;;       Procyon Common Lisp
\f
;;; ********************************
;;; To Do **************************
;;; ********************************
;;;
;;; COMPONENT-FULL-PATHNAME is a major source of slowness in the system
;;; because of all the calls to the expensive operations MAKE-PATHNAME
;;; and NAMESTRING. To improve performance, DEFSYSTEM should be reworked
;;; to avoid any need to call MAKE-PATHNAME and NAMESTRING, as the logical
;;; pathnames package does. Unfortunately, I don't have the time to do this
;;; right now. Instead, I installed a temporary improvement by memoizing
;;; COMPONENT-FULL-PATHNAME to cache previous calls to the function on
;;; a component by component and type by type basis. The cache is
;;; cleared before each call to OOS, in case filename extensions change.
;;; But DEFSYSTEM should really be reworked to avoid this problem and
;;; ensure greater portability and to also handle logical pathnames.
;;;
;;; Also, PROBE-FILE and FILE-WRITE-DATE are other sources of slowness.
;;; Perhaps by also memoizing FILE-WRITE-DATE and reimplementing PROBE-FILE
;;; in terms of FILE-WRITE-DATE, can achieve a further speed-up. This was
;;; suggested by Steven Feist (feist@ils.nwu.edu).
;;;
;;; True CLtL2 logical pathnames support -- can't do it, because CLtL2
;;; doesn't have all the necessary primitives, and even in Allegro CL 4.2
;;;   (namestring #l"foo:bar;baz.lisp")
;;; does not work properly.
;;;
;;; Create separate stand-alone documentation for defsystem, and also
;;; a test suite.
;;;
;;; Change SYSTEM to be a class instead of a struct, and make it a little
;;; more generic, so that it permits alternate system definitions.
;;; Replace OPERATE-ON-SYSTEM with MAP-SYSTEM (args: function, system-name,
;;; &rest options)
;;;
;;; Add a patch directory mechanism. Perhaps have several directories
;;; with code in them, and the first one with the specified file wins?
;;; LOAD-PATCHES function.
;;;
;;; Need way to load old binaries even if source is newer.
;;;
;;; Allow defpackage forms/package definitions in the defsystem? If
;;; a package not defined, look for and load a file named package.pkg?
;;;
;;; need to port for GNU CL (ala kcl)?
;;;
;;; Someone asked whether one can have :file components at top-level. I believe
;;; this is the case, but should double-check that it is possible (and if
;;; not, make it so).
;;;
;;; A common error/misconception seems to involve assuming that :system
;;; components should include the name of the system file, and that
;;; defsystem will automatically load the file containing the system
;;; definition and propagate operations to it. Perhaps this would be a
;;; nice feature to add.
;;;
;;; If a module is :load-only t, then it should not execute its :finally-do
;;; and :initially-do clauses during compilation operations, unless the
;;; module's files happen to be loaded during the operation.
;;;
;;; System Class. Customizable delimiters.
;;;
;;; Load a system (while not loading anything already loaded)
;;; and inform the user of out of date fasls with the choice
;;; to load the old fasl or recompile and then load the new
;;; fasl?
;;;
;;; modify compile-file-operation to handle a query keyword....
;;;
;;; Perhaps systems should keep around the file-write-date of the system
;;; definition file, to prevent excessive reloading of the system definition?
;;;
;;; load-file-operation needs to be completely reworked to simplify the
;;; logic of when files get loaded or not.
;;;
;;; Need to revamp output: Nesting and indenting verbose output doesn't
;;; seem cool, especially when output overflows the 80-column margins.
;;;
;;; Document various ways of writing a system. simple (short) form
;;; (where :components is just a list of filenames) in addition to verbose.
;;; Put documentation strings in code.
;;;
;;; :load-time for modules and systems -- maybe record the time the system
;;; was loaded/compiled here and print it in describe-system?
;;;
;;; Make it easy to define new functions that operate on a system. For
;;; example, a function that prints out a list of files that have changed,
;;; hardcopy-system, edit-system, etc.
;;;
;;; If a user wants to have identical systems for different lisps, do we
;;; force the user to use logical pathnames? Or maybe we should write a
;;; generic-pathnames package that parses any pathname format into a
;;; uniform underlying format (i.e., pull the relevant code out of
;;; logical-pathnames.lisp and clean it up a bit).
;;;
;;;    Verify that Mac pathnames now work with append-directories.
;;;
;;; A common human error is to violate the modularization by making a file
;;; in one module depend on a file in another module, instead of making
;;; one module depend on the other. This is caught because the dependency
;;; isn't found. However, is there any way to provide a more informative
;;; error message? Probably not, especially if the system has multiple
;;; files of the same name.
;;;
;;; For a module none of whose files needed to be compiled, have it print out
;;; "no files need recompilation".
;;;
;;; Write a system date/time to a file? (version information) I.e., if the
;;; filesystem supports file version numbers, write an auxiliary file to
;;; the system definition file that specifies versions of the system and
;;; the version numbers of the associated files.
;;;
;;; Add idea of a patch directory.
;;;
;;; In verbose printout, have it log a date/time at start and end of
;;; compilation:
;;;     Compiling system "test" on 31-Jan-91 21:46:47
;;;     by Defsystem version v2.0 01-FEB-91.
;;;
;;; Define other :force options:
;;;    :query    allows user to specify that a file not normally compiled
;;;              should be. OR
;;;    :confirm  allows user to specify that a file normally compiled
;;;              shouldn't be. AND
;;;
;;; We currently assume that compilation-load dependencies and if-changed
;;; dependencies are identical. However, in some cases this might not be
;;; true. For example, if we change a macro we have to recompile functions
;;; that depend on it (except in lisps that automatically do this, such
;;; as the new CMU Common Lisp), but not if we change a function. Splitting
;;; these apart (with appropriate defaulting) would be nice, but not worth
;;; doing immediately since it may save only a couple of file recompilations,
;;; while making defsystem much more complex than it already is.
;;;
;;; Current dependencies are limited to siblings. Maybe we should allow
;;; nephews and uncles? So long as it is still a DAG, we can sort it.
;;; Answer: No. The current setup enforces a structure on the modularity.
;;; Otherwise, why should we have modules if we're going to ignore it?
;;;
;;; Currently a file is recompiled more or less if the source is newer
;;; than the binary or if the file depends on a file that has changed
;;; (i.e., was recompiled in this session of a system operation).
;;; Neil Goldman <goldman@isi.edu> has pointed out that whether a file
;;; needs recompilation is really independent of the current session of
;;; a system operation, and depends only on the file-write-dates of the
;;; source and binary files for a system. Thus a file should require
;;; recompilation in the following circumstances:
;;;   1. If a file's source is newer than its binary, or
;;;   2. If a file's source is not newer than its binary, but the file
;;;      depends directly or indirectly on a module (or file) that is newer.
;;;      For a regular file use the file-write-date (FWD) of the source or
;;;      binary, whichever is more recent. For a load-only file, use the only
;;;      available FWD. For a module, use the most recent (max) FWD of any of
;;;      its components.
;;; The impact of this is that instead of using a boolean CHANGED variable
;;; throughout the code, we need to allow CHANGED to be NIL/T/<FWD> or
;;; maybe just the FWD timestamp, and to use the value of CHANGED in
;;; needs-compilation decisions. (Use of NIL/T as values is an optimization.
;;; The FWD timestamp which indicates the most recent time of any changes
;;; should be sufficient.) This will affect not just the
;;; compile-file-operation, but also the load-file-operation because of
;;; compilation during load. Also, since FWDs will be used more prevalently,
;;; we probably should couple this change with the inclusion of load-times
;;; in the component defstruct. This is a tricky and involved change, and
;;; requires more thought, since there are subtle cases where it might not
;;; be correct. For now, the change will have to wait until the DEFSYSTEM
;;; redesign.
\f
;;; ********************************************************************
;;; How to Use this System *********************************************
;;; ********************************************************************

;;; To use this system,
;;; 1. If you want to have a central registry of system definitions,
;;;    modify the value of the variable *central-registry* below.
;;; 2. Load this file (defsystem.lisp) in either source or compiled form,
;;; 3. Load the file containing the "defsystem" definition of your system,
;;; 4. Use the function "operate-on-system" to do things to your system.

;;; For more information, see the documentation and examples in
;;; lisp-utilities.ps.

;;; ********************************
;;; Usage Comments *****************
;;; ********************************

;;; If you use symbols in the system definition file, they get interned in
;;; the COMMON-LISP-USER package, which can lead to name conflicts when
;;; the system itself seeks to export the same symbol to the COMMON-LISP-USER
;;; package. The workaround is to use strings instead of symbols for the
;;; names of components in the system definition file. In the major overhaul,
;;; perhaps the user should be precluded from using symbols for such
;;; identifiers.
;;;
;;; If you include a tilde in the :source-pathname in Allegro, as in "~/lisp",
;;; file name expansion is much slower than if you use the full pathname,
;;; as in "/user/USERID/lisp".
;;;


;;; ****************************************************************
;;; Lisp Code ******************************************************
;;; ****************************************************************

;;; ********************************
;;; Massage CLtL2 onto *features* **
;;; ********************************
;;; Let's be smart about CLtL2 compatible Lisps:
(eval-when (compile load eval)
  #+(or (and allegro-version>= (version>= 4 0)) :mcl :sbcl)
  (pushnew :cltl2 *features*))

;;; ********************************
;;; Provide/Require/*modules* ******
;;; ********************************

;;; Since CLtL2 has dropped require and provide from the language, some
;;; lisps may not have the functions PROVIDE and REQUIRE and the
;;; global *MODULES*. So if lisp::provide and user::provide are not
;;; defined, we define our own.

;;; Hmmm. CMU CL old compiler gives bogus warnings here about functions
;;; and variables not being declared or bound, apparently because it
;;; sees that (or (fboundp 'lisp::require) (fboundp 'user::require)) returns
;;; T, so it doesn't really bother when compiling the body of the unless.
;;; The new compiler does this properly, so I'm not going to bother
;;; working around this.

;;; Some Lisp implementations return bogus warnings about assuming
;;; *MODULE-FILES* and *LIBRARY* to be special, and CANONICALIZE-MODULE-NAME
;;; and MODULE-FILES being undefined. Don't worry about them.

;;; Now that ANSI CL includes PROVIDE and REQUIRE again, is this code
;;; necessary?

#-(or :CMU
      :vms
      :mcl
      :lispworks
      :clisp
      :gcl
      :sbcl
      :cormanlisp
      :scl
      :abcl
      :ccl
      :ecl
      (and allegro-version>= (version>= 4 1)))
(eval-when #-(or :lucid)
           (:compile-toplevel :load-toplevel :execute)
           #+(or :lucid)
           (compile load eval)

  (unless (or (fboundp 'lisp::require)
              (fboundp 'user::require)

              #+(and :excl (and allegro-version>= (version>= 4 0)))
              (fboundp 'cltl1::require)

              #+:lispworks
              (fboundp 'system::require))

    #-:lispworks
    (in-package :lisp)
    #+:lispworks
    (in-package :system)

    (export '(*modules* provide require))

    ;; Documentation strings taken almost literally from CLtL1.

    (defvar *modules* ()
      "List of names of the modules that have been loaded into Lisp so far.
     It is used by PROVIDE and REQUIRE.")

    ;; We provide two different ways to define modules. The default way
    ;; is to put either a source or binary file with the same name
    ;; as the module in the library directory. The other way is to define
    ;; the list of files in the module with defmodule.

    ;; The directory listed in *library* is implementation dependent,
    ;; and is intended to be used by Lisp manufacturers as a place to
    ;; store their implementation dependent packages.
    ;; Lisp users should use systems and *central-registry* to store
    ;; their packages -- it is intended that *central-registry* is
    ;; set by the user, while *library* is set by the lisp.

    (defvar *library* nil               ; "/usr/local/lisp/Modules/"
      "Directory within the file system containing files, where the name
     of a file is the same as the name of the module it contains.")

    (defvar *module-files* (make-hash-table :test #'equal)
      "Hash table mapping from module names to list of files for the
     module. REQUIRE loads these files in order.")

    (defun canonicalize-module-name (name)
      ;; if symbol, string-downcase the printrep to make nicer filenames.
      (if (stringp name) name (string-downcase (string name))))

    (defmacro defmodule (name &rest files)
      "Defines a module NAME to load the specified FILES in order."
      `(setf (gethash (canonicalize-module-name ,name) *module-files*)
             ',files))
    (defun module-files (name)
      (gethash name *module-files*))

    (defun provide (name)
      "Adds a new module name to the list of modules maintained in the
     variable *modules*, thereby indicating that the module has been
     loaded. Name may be a string or symbol -- strings are case-senstive,
     while symbols are treated like lowercase strings. Returns T if
     NAME was not already present, NIL otherwise."
      (let ((module (canonicalize-module-name name)))
        (unless (find module *modules* :test #'string=)
          ;; Module not present. Add it and return T to signify that it
          ;; was added.
          (push module *modules*)
          t)))

    (defun require (name &optional pathname)
      "Tests whether a module is already present. If the module is not
     present, loads the appropriate file or set of files. The pathname
     argument, if present, is a single pathname or list of pathnames
     whose files are to be loaded in order, left to right. If the
     pathname is nil, the system first checks if a module was defined
     using defmodule and uses the pathnames so defined. If that fails,
     it looks in the library directory for a file with name the same
     as that of the module. Returns T if it loads the module."
      (let ((module (canonicalize-module-name name)))
        (unless (find module *modules* :test #'string=)
          ;; Module is not already present.
          (when (and pathname (not (listp pathname)))
            ;; If there's a pathname or pathnames, ensure that it's a list.
            (setf pathname (list pathname)))
          (unless pathname
            ;; If there's no pathname, try for a defmodule definition.
            (setf pathname (module-files module)))
          (unless pathname
            ;; If there's still no pathname, try the library directory.
            (when *library*
              (setf pathname (concatenate 'string *library* module))
              ;; Test if the file exists.
              ;; We assume that the lisp will default the file type
              ;; appropriately. If it doesn't, use #+".fasl" or some
              ;; such in the concatenate form above.
              (if (probe-file pathname)
                  ;; If it exists, ensure we've got a list
                  (setf pathname (list pathname))
                  ;; If the library file doesn't exist, we don't want
                  ;; a load error.
                  (setf pathname nil))))
          ;; Now that we've got the list of pathnames, let's load them.
          (dolist (pname pathname t)
            (load pname :verbose nil))))))
  ) ; eval-when

;;; ********************************
;;; Set up Package *****************
;;; ********************************


;;; Unfortunately, lots of lisps have their own defsystems, some more
;;; primitive than others, all uncompatible, and all in the DEFSYSTEM
;;; package. To avoid name conflicts, we've decided to name this the
;;; MAKE package. A nice side-effect is that the short nickname
;;; MK is my initials.

#+abcl (defpackage make (:use "COMMON-LISP") (:nicknames "MK"))

#+(or clisp cormanlisp ecl (and gcl defpackage) sbcl ccl)
(defpackage "MAKE" (:use "COMMON-LISP") (:nicknames "MK"))

#-(or :sbcl :cltl2 :lispworks :ecl :scl :abcl :ccl)
(in-package :make :nicknames '("MK"))

;;; For CLtL2 compatible lisps...
#+(and :excl :allegro-v4.0 :cltl2)
(defpackage "MAKE" (:nicknames "MK" "make" "mk") (:use :common-lisp)
            (:import-from cltl1 *modules* provide require))

;;; *** Marco Antoniotti <marcoxa@icsi.berkeley.edu> 19970105
;;; In Allegro 4.1, 'provide' and 'require' are not external in
;;; 'CLTL1'.  However they are in 'COMMON-LISP'.  Hence the change.
#+(and :excl :allegro-v4.1 :cltl2)
(defpackage "MAKE" (:nicknames "MK" "make" "mk") (:use :common-lisp) )

#+(and :excl :allegro-version>= (version>= 4 2))
(defpackage "MAKE" (:nicknames "MK" "make" "mk") (:use :common-lisp))

#+:lispworks
(defpackage "MAKE" (:nicknames "MK") (:use "COMMON-LISP")
            (:import-from system *modules* provide require)
            (:export "DEFSYSTEM" "COMPILE-SYSTEM" "LOAD-SYSTEM"
                     "DEFINE-LANGUAGE" "*MULTIPLE-LISP-SUPPORT*"))

#+:mcl
(defpackage "MAKE" (:nicknames "MK") (:use "COMMON-LISP")
  (:import-from ccl *modules* provide require))

;;; *** Marco Antoniotti <marcoxa@icsi.berkeley.edu> 19951012
;;; The code below, is originally executed also for CMUCL. However I
;;; believe this is wrong, since CMUCL comes with its own defpackage.
;;; I added the extra :CMU in the 'or'.
#+(and :cltl2 (not (or :cmu :scl :clisp :sbcl :abcl
                       (and :excl (or :allegro-v4.0 :allegro-v4.1))
                       :mcl)))
(eval-when (compile load eval)
  (unless (find-package "MAKE")
    (make-package "MAKE" :nicknames '("MK") :use '("COMMON-LISP"))))

;;; *** Marco Antoniotti <marcoxa@icsi.berkeley.edu> 19951012
;;; Here I add the proper defpackage for CMU
#+:CMU
(defpackage "MAKE" (:use "COMMON-LISP" "CONDITIONS")
  (:nicknames "MK"))

#+:sbcl
(defpackage "MAKE" (:use "COMMON-LISP")
  (:nicknames "MK"))

#+:scl
(defpackage :make (:use :common-lisp)
  (:nicknames :mk))

#+(or :cltl2 :lispworks :scl)
(eval-when (compile load eval)
  (in-package :make))

#+(or ecl abcl ccl)
(in-package :make)

;;; *** Marco Antoniotti <marcoxa@icsi.berkeley.edu> 19970105
;;; 'provide' is not esternal in 'CLTL1' in Allegro v 4.1
#+(and :excl :allegro-v4.0 :cltl2)
(cltl1:provide 'make)
#+(and :excl :allegro-v4.0 :cltl2)
(provide 'make)

#+:openmcl
(cl:provide 'make)

#+(and :mcl (not :openmcl))
(ccl:provide 'make)

#+(and :cltl2 (not (or (and :excl (or :allegro-v4.0 :allegro-v4.1)) :mcl)))
(provide 'make)

#+:lispworks
(provide 'make)

#-(or :cltl2 :lispworks)
(provide 'make)

(pushnew :mk-defsystem *features*)

;;; Some compatibility issues.  Mostly for CormanLisp.
;;; 2002-02-20 Marco Antoniotti

#+cormanlisp
(defun compile-file-pathname (pathname-designator)
 (merge-pathnames (make-pathname :type "fasl")
                  (etypecase pathname-designator
                    (pathname pathname-designator)
                    (string (parse-namestring pathname-designator))
                    ;; We need FILE-STREAM here as well.
                    )))

#+cormanlisp
(defun file-namestring (pathname-designator)
  (let ((p (etypecase pathname-designator
             (pathname pathname-designator)
             (string (parse-namestring pathname-designator))
             ;; We need FILE-STREAM here as well.
             )))
    (namestring (make-pathname :directory ()
                               :name (pathname-name p)
                               :type (pathname-type p)
                               :version (pathname-version p)))))

;;; The external interface consists of *exports* and *other-exports*.

;;; AKCL (at least 1.603) grabs all the (export) forms and puts them up top in
;;; the compile form, so that you can't use a defvar with a default value and
;;; then a succeeding export as well.

(eval-when (compile load eval)
   (defvar *special-exports* nil)
   (defvar *exports* nil)
   (defvar *other-exports* nil)

   (export (setq *exports*
                 '(operate-on-system
                   oos
                   afs-binary-directory afs-source-directory
                   files-in-system)))
   (export (setq *special-exports*
                 '()))
   (export (setq *other-exports*
                 '(*central-registry*
                   *bin-subdir*

                   add-registry-location
                   find-system
                   defsystem compile-system load-system hardcopy-system

                   system-definition-pathname

                   missing-component
                   missing-component-name
                   missing-component-component
                   missing-module
                   missing-system

                   register-foreign-system

                   machine-type-translation
                   software-type-translation
                   compiler-type-translation
                   ;; require
                   define-language
                   allegro-make-system-fasl
                   files-which-need-compilation
                   undefsystem
                   defined-systems
                   describe-system clean-system edit-system ;hardcopy-system
                   system-source-size make-system-tag-table
                   *defsystem-version*
                   *compile-during-load*
                   *minimal-load*
                   *dont-redefine-require*
                   *files-missing-is-an-error*
                   *reload-systems-from-disk*
                   *source-pathname-default*
                   *binary-pathname-default*
                   *multiple-lisp-support*
                   ))))


;;; We import these symbols into the USER package to make them
;;; easier to use. Since some lisps have already defined defsystem
;;; in the user package, we may have to shadowing-import it.
#|
#-(or :sbcl :cmu :ccl :allegro :excl :lispworks :symbolics)
(eval-when (compile load eval)
  (import *exports* #-(or :cltl2 :lispworks) :user
                    #+(or :cltl2 :lispworks) :common-lisp-user)
  (import *special-exports* #-(or :cltl2 :lispworks) :user
                            #+(or :cltl2 :lispworks) :common-lisp-user))
#+(or :sbcl :cmu :ccl :allegro :excl :lispworks :symbolics)
(eval-when (compile load eval)
  (import *exports* #-(or :cltl2 :lispworks) :user
                    #+(or :cltl2 :lispworks) :common-lisp-user)
  (shadowing-import *special-exports*
                    #-(or :cltl2 :lispworks) :user
                    #+(or :cltl2 :lispworks) :common-lisp-user))
|#

#-(or :pcl :clos :scl)
(when (find-package :pcl)
  (pushnew :pcl *modules*)
  (pushnew :pcl *features*))

;;; ********************************
;;; Defsystem Version **************
;;; ********************************
(defparameter *defsystem-version* "3.4 Interim 3, 2004-06-10"
  "Current version number/date for MK:DEFSYSTEM.")

;;; ********************************
;;; Customizable System Parameters *
;;; ********************************

(defvar *dont-redefine-require*
  #+cmu (if (find-symbol "*MODULE-PROVIDER-FUNCTIONS*" :ext) t nil)
  #+(or allegro ccl clisp sbcl) t
  #-(or allegro ccl clisp cmu sbcl) nil
  "If T, prevents the redefinition of REQUIRE. This is useful for
   lisps that treat REQUIRE specially in the compiler.")

(defvar *multiple-lisp-support* t
  "If T, afs-binary-directory will try to return a name dependent
   on the particular lisp compiler version being used.")

;;; home-subdirectory --
;;; HOME-SUBDIRECTORY is used only in *central-registry* below.
;;; Note that CMU CL 17e does not understand the ~/ shorthand for home
;;; directories.
;;;
;;; Note:
;;; 20020220 Marco Antoniotti
;;; The #-cormanlisp version is the original one, which is broken anyway, since
;;; it is UNIX dependent.
;;; I added the kludgy #+cormalisp (v 1.5) one, since it is missing
;;; the ANSI USER-HOMEDIR-PATHNAME function.
#-cormanlisp
(defun home-subdirectory (directory)
  (concatenate 'string
        #+(or :sbcl :cmu)
        "home:"
        #+scl "file://home/"
        #-(or :sbcl :cmu :scl)
        (let ((homedir (user-homedir-pathname)))
          (or (and homedir (namestring homedir))
              "~/"))
        directory))

#+cormanlisp
(defun home-subdirectory (directory)
  (declare (type string directory))
  (concatenate 'string "C:\\" directory))

;;; The following function is available for users to add
;;;   (setq mk:*central-registry* (defsys-env-search-path))
;;; to Lisp init files in order to use the value of the DEFSYSPATH
;;; instead of directly coding it in the file.
#+:allegro
(defun defsys-env-search-path ()
  "This function grabs the value of the DEFSYSPATH environment variable
   and breaks the search path into a list of paths."
  (remove-duplicates (split-string (sys:getenv "DEFSYSPATH") :item #\:)
                     :test #'string-equal))

;;; Change this variable to set up the location of a central
;;; repository for system definitions if you want one.
;;; This is a defvar to allow users to change the value in their
;;; lisp init files without worrying about it reverting if they
;;; reload defsystem for some reason.

;;; Note that if a form is included in the registry list, it will be evaluated
;;; in COMPUTE-SYSTEM-PATH to return the appropriate directory to check.

(defvar *central-registry*
  `(;; Current directory
    "./"
    #+:LUCID     (working-directory)
    #+ACLPC      (current-directory)
    #+:allegro   (excl:current-directory)
    #+:sbcl      (progn *default-pathname-defaults*)
    #+(or :cmu :scl)       (ext:default-directory)
    ;; *** Marco Antoniotti <marcoxa@icsi.berkeley.edu>
    ;; Somehow it is better to qualify default-directory in CMU with
    ;; the appropriate package (i.e. "EXTENSIONS".)
    ;; Same for Allegro.
    #+(and :lispworks (not :lispworks4))
    ,(multiple-value-bind (major minor)
                          #-:lispworks-personal-edition
              (values system::*major-version-number*
                      system::*minor-version-number*)
                          #+:lispworks-personal-edition
                          (values system::*major-version-number*
                                  system::*minor-version-number*)
       (if (or (> major 3)
               (and (= major 3) (> minor 2))
               (and (= major 3) (= minor 2)
                    (equal (lisp-implementation-version) "3.2.1")))
           `(make-pathname :directory
                           ,(find-symbol "*CURRENT-WORKING-DIRECTORY*"
                                         (find-package "SYSTEM")))
           (find-symbol "*CURRENT-WORKING-DIRECTORY*"
                        (find-package "LW"))))
    #+:lispworks4
    (hcl:get-working-directory)
    ;; Home directory
    #-sbcl
    (mk::home-subdirectory "lisp/systems/")

    ;; Global registry
    "/usr/local/lisp/Registry/")
  "Central directory of system definitions. May be either a single
   directory pathname, or a list of directory pathnames to be checked
   after the local directory.")


(defun add-registry-location (pathname)
  "Adds a path to the central registry."
  (pushnew pathname *central-registry* :test #'equal))

(defvar *bin-subdir* ".bin/"
  "The subdirectory of an AFS directory where the binaries are really kept.")

;;; These variables set up defaults for operate-on-system, and are used
;;; for communication in lieu of parameter passing. Yes, this is bad,
;;; but it keeps the interface small. Also, in the case of the -if-no-binary
;;; variables, parameter passing would require multiple value returns
;;; from some functions. Why make life complicated?
(defvar *tell-user-when-done* nil
  "If T, system will print ...DONE at the end of an operation")
(defvar *oos-verbose* nil
  "Operate on System Verbose Mode")
(defvar *oos-test* nil
  "Operate on System Test Mode")
(defvar *load-source-if-no-binary* nil
  "If T, system will try loading the source if the binary is missing")
(defvar *bother-user-if-no-binary* t
  "If T, the system will ask the user whether to load the source if
   the binary is missing")
(defvar *load-source-instead-of-binary* nil
  "If T, the system will load the source file instead of the binary.")
(defvar *compile-during-load* :query
  "If T, the system will compile source files during load if the
   binary file is missing. If :query, it will ask the user for
   permission first.")
(defvar *minimal-load* nil
  "If T, the system tries to avoid reloading files that were already loaded
   and up to date.")

(defvar *files-missing-is-an-error* t
  "If both the source and binary files are missing, signal a continuable
   error instead of just a warning.")

(defvar *operations-propagate-to-subsystems* t
  "If T, operations like :COMPILE and :LOAD propagate to subsystems
   of a system that are defined either using a component-type of :system
   or by another defsystem form.")

;;; Particular to CMULisp
(defvar *compile-error-file-type* "err"
  "File type of compilation error file in cmulisp")
(defvar *cmu-errors-to-terminal* t
  "Argument to :errors-to-terminal in compile-file in cmulisp")
(defvar *cmu-errors-to-file* t
  "If T, cmulisp will write an error file during compilation")

;;; ********************************
;;; Global Variables ***************
;;; ********************************

;;; Massage people's *features* into better shape.
(eval-when (compile load eval)
  (dolist (feature *features*)
    (when (and (symbolp feature)   ; 3600
               (equal (symbol-name feature) "CMU"))
      (pushnew :CMU *features*)))

  #+Lucid
  (when (search "IBM RT PC" (machine-type))
    (pushnew :ibm-rt-pc *features*))
  )

;;; *filename-extensions* is a cons of the source and binary extensions.
(defvar *filename-extensions*
  (car `(#+(and Symbolics Lispm)              ("lisp" . "bin")
         #+(and dec common vax (not ultrix))  ("LSP"  . "FAS")
         #+(and dec common vax ultrix)        ("lsp"  . "fas")
         #+ACLPC                              ("lsp"  . "fsl")
         #+CLISP                              ("lisp" . "fas")
         #+KCL                                ("lsp"  . "o")
         #+ECL                                ("lsp"  . #+msvc "obj" #-msvc "fas")
         #+IBCL                               ("lsp"  . "o")
         #+Xerox                              ("lisp" . "dfasl")
         ;; Lucid on Silicon Graphics
         #+(and Lucid MIPS)                   ("lisp" . "mbin")
         ;; the entry for (and lucid hp300) must precede
         ;; that of (and lucid mc68000) for hp9000/300's running lucid,
         ;; since *features* on hp9000/300's also include the :mc68000
         ;; feature.
         #+(and lucid hp300)                  ("lisp" . "6bin")
         #+(and Lucid MC68000)                ("lisp" . "lbin")
         #+(and Lucid Vax)                    ("lisp" . "vbin")
         #+(and Lucid Prime)                  ("lisp" . "pbin")
         #+(and Lucid SUNRise)                ("lisp" . "sbin")
         #+(and Lucid SPARC)                  ("lisp" . "sbin")
         #+(and Lucid :IBM-RT-PC)             ("lisp" . "bbin")
         ;; PA is Precision Architecture, HP's 9000/800 RISC cpu
         #+(and Lucid PA)                     ("lisp" . "hbin")
         #+excl ("cl"   . ,(pathname-type (compile-file-pathname "foo.cl")))
         #+(or cmu scl) ("lisp" . ,(or (c:backend-fasl-file-type c:*backend*) "fasl"))
;        #+(and :CMU (not (or :sgi :sparc)))  ("lisp" . "fasl")
;        #+(and :CMU :sgi)                    ("lisp" . "sgif")
;        #+(and :CMU :sparc)                  ("lisp" . "sparcf")
         #+PRIME                              ("lisp" . "pbin")
         #+HP                                 ("l"    . "b")
         #+TI ("lisp" . #.(string (si::local-binary-file-type)))
         #+:gclisp                            ("LSP"  . "F2S")
         #+pyramid                            ("clisp" . "o")

         ;; Harlequin LispWorks
         #+:lispworks         ("lisp" . ,COMPILER:*FASL-EXTENSION-STRING*)
;        #+(and :sun4 :lispworks)             ("lisp" . "wfasl")
;        #+(and :mips :lispworks)             ("lisp" . "mfasl")
         #+:mcl                               ("lisp" . ,(pathname-type (compile-file-pathname "foo.lisp")))
         #+:coral                             ("lisp" . "fasl")

         ;; Otherwise,
         ("lisp" . ,(pathname-type (compile-file-pathname "foo.lisp")))))
  "Filename extensions for Common Lisp. A cons of the form
   (Source-Extension . Binary-Extension). If the system is
   unknown (as in *features* not known), defaults to lisp and fasl.")

(defvar *system-extension*
  ;; MS-DOS systems can only handle three character extensions.
  #-ACLPC "system"
  #+ACLPC "sys"
  "The filename extension to use with systems.")

;;; The above variables and code should be extended to allow a list of
;;; valid extensions for each lisp implementation, instead of a single
;;; extension. When writing a file, the first extension should be used.
;;; But when searching for a file, every extension in the list should
;;; be used. For example, CMU Common Lisp recognizes "lisp" "l" "cl" and
;;; "lsp" (*load-source-types*) as source code extensions, and
;;; (c:backend-fasl-file-type c:*backend*)
;;; (c:backend-byte-fasl-file-type c:*backend*)
;;; and "fasl" as binary (object) file extensions (*load-object-types*).

;;; Note that the above code is used below in the LANGUAGE defstruct.

;;; There is no real support for this variable being nil, so don't change it.
;;; Note that in any event, the toplevel system (defined with defsystem)
;;; will have its dependencies delayed. Not having dependencies delayed
;;; might be useful if we define several systems within one defsystem.
(defvar *system-dependencies-delayed* t
  "If T, system dependencies are expanded at run time")

;;; Replace this with consp, dammit!
(defun non-empty-listp (list)
  (and list (listp list)))

;;; ********************************
;;; Component Operation Definition *
;;; ********************************
(eval-when (:compile-toplevel :load-toplevel :execute)
(defvar *version-dir* nil
  "The version subdir. bound in operate-on-system.")
(defvar *version-replace* nil
  "The version replace. bound in operate-on-system.")
(defvar *version* nil
  "Default version."))

(defvar *component-operations* (make-hash-table :test #'equal)
  "Hash table of (operation-name function) pairs.")
(defun component-operation (name &optional operation)
  (if operation
      (setf (gethash name *component-operations*) operation)
      (gethash name *component-operations*)))

;;; ********************************
;;; AFS @sys immitator *************
;;; ********************************

;;; mc 11-Apr-91: Bashes MCL's point reader, so commented out.
#-:mcl
(eval-when (compile load eval)
  ;; Define #@"foo" as a shorthand for (afs-binary-directory "foo").
  ;; For example,
  ;;    <cl> #@"foo"
  ;;    "foo/.bin/rt_mach/"
  (set-dispatch-macro-character
   #\# #\@
   #'(lambda (stream char arg)
       (declare (ignore char arg))
       `(afs-binary-directory ,(read stream t nil t)))))

(defvar *find-irix-version-script*
    "\"1,4 d\\
s/^[^M]*IRIX Execution Environment 1, *[a-zA-Z]* *\\([^ ]*\\)/\\1/p\\
/./,$ d\\
\"")

(defun operating-system-version ()
  #+(and :sgi :excl)
  (let* ((full-version (software-version))
         (blank-pos (search " " full-version))
         (os (subseq full-version 0 blank-pos))
         (version-rest (subseq full-version
                               (1+ blank-pos)))
         os-version)
    (setq blank-pos (search " " version-rest))
    (setq version-rest (subseq version-rest
                               (1+ blank-pos)))
    (setq blank-pos (search " " version-rest))
    (setq os-version (subseq version-rest 0 blank-pos))
    (setq version-rest (subseq version-rest
                               (1+ blank-pos)))
    (setq blank-pos (search " " version-rest))
    (setq version-rest (subseq version-rest
                               (1+ blank-pos)))
    (concatenate 'string
      os " " os-version))      ; " " version-rest
  #+(and :sgi :cmu :sbcl)
  (concatenate 'string
    (software-type)
    (software-version))
  #+(and :lispworks :irix)
  (let ((soft-type (software-type)))
    (if (equalp soft-type "IRIX5")
        (progn
          (foreign:call-system
            (format nil "versions ~A | sed -e ~A > ~A"
                         "eoe1"
                         *find-irix-version-script*
                         "irix-version")
            "/bin/csh")
          (with-open-file (s "irix-version")
                          (format nil "IRIX ~S"
                                  (read s))))
      soft-type))
  #-(or (and :excl :sgi) (and :cmu :sgi) (and :lispworks :irix))
  (software-type))

(defun compiler-version ()
  #+:lispworks (concatenate 'string
                "lispworks" " " (lisp-implementation-version))
  #+excl      (concatenate 'string
                "excl" " " excl::*common-lisp-version-number*)
  #+sbcl      (concatenate 'string
                           "sbcl" " " (lisp-implementation-version))
  #+cmu       (concatenate 'string
                "cmu" " " (lisp-implementation-version))
  #+scl       (concatenate 'string
                "scl" " " (lisp-implementation-version))

  #+kcl       "kcl"
  #+IBCL      "ibcl"
  #+akcl      "akcl"
  #+gcl       "gcl"
  #+ecl       "ecl"
  #+lucid     "lucid"
  #+ACLPC     "aclpc"
  #+CLISP     "clisp"
  #+Xerox     "xerox"
  #+symbolics "symbolics"
  #+mcl       "mcl"
  #+coral     "coral"
  #+gclisp    "gclisp"
  )

(defun afs-binary-directory (root-directory)
  ;; Function for obtaining the directory AFS's @sys feature would have
  ;; chosen when we're not in AFS. This function is useful as the argument
  ;; to :binary-pathname in defsystem. For example,
  ;; :binary-pathname (afs-binary-directory "scanner/")
  (let ((machine (machine-type-translation
                  #-(and :sgi :allegro-version>= (version>= 4 2))
                  (machine-type)
                  #+(and :sgi :allegro-version>= (version>= 4 2))
                  (machine-version)))
        (software (software-type-translation
                   #-(and :sgi (or :cmu :sbcl :scl
                                   (and :allegro-version>= (version>= 4 2))))
                   (software-type)
                   #+(and :sgi (or :cmu :sbcl :scl
                                   (and :allegro-version>= (version>= 4 2))))
                   (operating-system-version)))
        (lisp (compiler-type-translation (compiler-version))))
    ;; pmax_mach rt_mach sun3_35 sun3_mach vax_mach
    (setq root-directory (namestring root-directory))
    (setq root-directory (ensure-trailing-slash root-directory))
    (format nil "~A~@[~A~]~@[~A/~]"
            root-directory
            *bin-subdir*
            (if *multiple-lisp-support*
                (afs-component machine software lisp)
              (afs-component machine software)))))

(defun afs-source-directory (root-directory &optional version-flag)
  ;; Function for obtaining the directory AFS's @sys feature would have
  ;; chosen when we're not in AFS. This function is useful as the argument
  ;; to :source-pathname in defsystem.
  (setq root-directory (namestring root-directory))
  (setq root-directory (ensure-trailing-slash root-directory))
  (format nil "~A~@[~A/~]"
          root-directory
          (and version-flag (translate-version *version*))))

(defun null-string (s)
  (when (stringp s)
    (string-equal s "")))

(defun ensure-trailing-slash (dir)
  (if (and dir
           (not (null-string dir))
           (not (char= (char dir
                             (1- (length dir)))
                       #\/))
           (not (char= (char dir
                             (1- (length dir)))
                       #\\))
           )
      (concatenate 'string dir "/")
      dir))

(defun afs-component (machine software &optional lisp)
  (format nil "~@[~A~]~@[_~A~]~@[_~A~]"
            machine
            (or software "mach")
            lisp))

(defvar *machine-type-alist* (make-hash-table :test #'equal)
  "Hash table for retrieving the machine-type")
(defun machine-type-translation (name &optional operation)
  (if operation
      (setf (gethash (string-upcase name) *machine-type-alist*) operation)
      (gethash (string-upcase name) *machine-type-alist*)))

(machine-type-translation "IBM RT PC"                        "rt")
(machine-type-translation "DEC 3100"                         "pmax")
(machine-type-translation "DEC VAX-11"                       "vax")
(machine-type-translation "DECstation"                       "pmax")
(machine-type-translation "Sun3"                             "sun3")
(machine-type-translation "Sun-4"                            "sun4")
(machine-type-translation "MIPS Risc"                        "mips")
(machine-type-translation "SGI"                              "sgi")
(machine-type-translation "Silicon Graphics Iris 4D"         "sgi")
(machine-type-translation "Silicon Graphics Iris 4D (R3000)" "sgi")
(machine-type-translation "Silicon Graphics Iris 4D (R4000)" "sgi")
(machine-type-translation "Silicon Graphics Iris 4D (R4400)" "sgi")
(machine-type-translation "IP22"                             "sgi")
;;; MIPS R4000 Processor Chip Revision: 3.0
;;; MIPS R4400 Processor Chip Revision: 5.0
;;; MIPS R4600 Processor Chip Revision: 1.0
(machine-type-translation "IP20"                             "sgi")
;;; MIPS R4000 Processor Chip Revision: 3.0
(machine-type-translation "IP17"                             "sgi")
;;; MIPS R4000 Processor Chip Revision: 2.2
(machine-type-translation "IP12"                             "sgi")
;;; MIPS R2000A/R3000 Processor Chip Revision: 3.0
(machine-type-translation "IP7"                              "sgi")
;;; MIPS R2000A/R3000 Processor Chip Revision: 3.0

(machine-type-translation "x86"                              "x86")
;;; ACL
(machine-type-translation "IBM PC Compatible"                "x86")
;;; LW
(machine-type-translation "I686"                             "x86")
;;; LW
(machine-type-translation "PC/386"                           "x86")
;;; CLisp Win32

;;; SCL.
(machine-type-translation "AMD64"                            "amd64")

#+(and :lucid :sun :mc68000)
(machine-type-translation "unknown"     "sun3")


(defvar *software-type-alist* (make-hash-table :test #'equal)
  "Hash table for retrieving the software-type")
(defun software-type-translation (name &optional operation)
  (if operation
      (setf (gethash (string-upcase name) *software-type-alist*) operation)
      (gethash (string-upcase name) *software-type-alist*)))

(software-type-translation "BSD UNIX"      "mach") ; "unix"
(software-type-translation "Ultrix"        "mach") ; "ultrix"
(software-type-translation "SunOS"         "SunOS")
(software-type-translation "MACH/4.3BSD"   "mach")
(software-type-translation "IRIX System V" "irix") ; (software-type)
(software-type-translation "IRIX5"         "irix5")
;;(software-type-translation "IRIX liasg5 5.2 02282016 IP22 mips" "irix5") ; (software-version)

(software-type-translation "IRIX 5.2" "irix5")
(software-type-translation "IRIX 5.3" "irix5")
(software-type-translation "IRIX5.2"  "irix5")
(software-type-translation "IRIX5.3"  "irix5")

(software-type-translation "Linux" "linux") ; Lispworks for Linux
(software-type-translation "Linux 2.x, Redhat 6.x and 7.x" "linux") ; ACL
(software-type-translation "Microsoft Windows 9x/Me and NT/2000/XP" "win32")
(software-type-translation "Windows NT" "win32") ; LW for Windows
(software-type-translation "ANSI C program" "ansi-c") ; CLISP
(software-type-translation "C compiler" "ansi-c") ; CLISP for Win32

(software-type-translation nil             "")

#+:lucid
(software-type-translation "Unix"
                           #+:lcl4.0 "4.0"
                           #+(and :lcl3.0 (not :lcl4.0)) "3.0")

(defvar *compiler-type-alist* (make-hash-table :test #'equal)
  "Hash table for retrieving the Common Lisp type")
(defun compiler-type-translation (name &optional operation)
  (if operation
      (setf (gethash (string-upcase name) *compiler-type-alist*) operation)
      (gethash (string-upcase name) *compiler-type-alist*)))

(compiler-type-translation "lispworks 3.2.1"         "lispworks")
(compiler-type-translation "lispworks 3.2.60 beta 6" "lispworks")
(compiler-type-translation "lispworks 4.2.0"         "lispworks")

#+allegro
(eval-when (:compile-toplevel :load-toplevel :execute)
  (unless (or (find :case-sensitive common-lisp:*features*)
              (find :case-insensitive common-lisp:*features*))
    (if (or (eq excl:*current-case-mode* :case-sensitive-lower)
            (eq excl:*current-case-mode* :case-sensitive-upper))
        (push :case-sensitive common-lisp:*features*)
      (push :case-insensitive common-lisp:*features*))))


#+(and allegro case-sensitive ics)
(compiler-type-translation "excl 6.1" "excl-m")
#+(and allegro case-sensitive (not ics))
(compiler-type-translation "excl 6.1" "excl-m8")

#+(and allegro case-insensitive ics)
(compiler-type-translation "excl 6.1" "excl-a")
#+(and allegro case-insensitive (not ics))
(compiler-type-translation "excl 6.1" "excl-a8")

(compiler-type-translation "excl 4.2" "excl")
(compiler-type-translation "excl 4.1" "excl")
(compiler-type-translation "cmu 17f" "cmu")
(compiler-type-translation "cmu 17e" "cmu")
(compiler-type-translation "cmu 17d" "cmu")

(compiler-type-translation "scl 1.2.7" "scl")
(compiler-type-translation "scl 1.2.8" "scl")
(compiler-type-translation "scl 1.2.9" "scl")

;;; ********************************
;;; System Names *******************
;;; ********************************

;;; If you use strings for system names, be sure to use the same case
;;; as it appears on disk, if the filesystem is case sensitive.
(defun canonicalize-system-name (name)
  ;; Originally we were storing systems using GET. This meant that the
  ;; name of a system had to be a symbol, so we interned the symbols
  ;; in the keyword package to avoid package dependencies. Now that we're
  ;; storing the systems in a hash table, we've switched to using strings.
  ;; Since the hash table is case sensitive, we use uppercase strings.
  ;; (Names of modules and files may be symbols or strings.)
  #||(if (keywordp name)
      name
      (intern (string-upcase (string name)) "KEYWORD"))||#
  (if (stringp name) (string-upcase name) (string-upcase (string name))))

(defvar *defined-systems* (make-hash-table :test #'equal)
  "Hash table containing the definitions of all known systems.")

(defun get-system (name)
  "Returns the definition of the system named NAME."
  (gethash (canonicalize-system-name name) *defined-systems*))

(defsetf get-system (name) (value)
  `(setf (gethash (canonicalize-system-name ,name) *defined-systems*) ,value))

(defun undefsystem (name)
  "Removes the definition of the system named NAME."
  (setf (get-system name) nil))

(defun defined-systems ()
  "Returns a list of defined systems."
  (let ((result nil))
    (maphash #'(lambda (key value)
                 (declare (ignore key))
                 (push value result))
             *defined-systems*)
    result))

;;; ********************************
;;; Directory Pathname Hacking *****
;;; ********************************

;;; Unix example: An absolute directory starts with / while a
;;; relative directory doesn't. A directory ends with /, while
;;; a file's pathname doesn't. This is important 'cause
;;; (pathname-directory "foo/bar") will return "foo" and not "foo/".

;;; I haven't been able to test the fix to the problem with symbolics
;;; hosts. Essentially, append-directories seems to have been tacking
;;; the default host onto the front of the pathname (e.g., mk::source-pathname
;;; gets a "B:" on front) and this overrides the :host specified in the
;;; component. The value of :host should override that specified in
;;; the :source-pathname and the default file server. If this doesn't
;;; fix things, specifying the host in the root pathname "F:>root-dir>"
;;; may be a good workaround.

;;; Need to verify that merging of pathnames where modules are located
;;; on different devices (in VMS-based VAXLisp) now works.

;;; Merge-pathnames works for VMS systems. In VMS systems, the directory
;;; part is enclosed in square brackets, e.g.,
;;;     "[root.child.child_child]" or "[root.][child.][child_child]"
;;; To concatenate directories merge-pathnames works as follows:
;;;     (merge-pathnames "" "[root]")               ==> "[root]"
;;;     (merge-pathnames "[root.]" "[son]file.ext") ==> "[root.son]file.ext"
;;;     (merge-pathnames "[root.]file.ext" "[son]") ==> "[root.son]file.ext"
;;;     (merge-pathnames "[root]file.ext" "[son]")  ==> "[root]file.ext"
;;; Thus the problem with the #-VMS code was that it was merging x y into
;;; [[x]][y] instead of [x][y] or [x]y.

;;; Miscellaneous notes:
;;;   On GCLisp, the following are equivalent:
;;;       "\\root\\subdir\\BAZ"
;;;       "/root/subdir/BAZ"
;;;   On VAXLisp, the following are equivalent:
;;;       "[root.subdir]BAZ"
;;;       "[root.][subdir]BAZ"
;;; Use #+:vaxlisp for VAXLisp 3.0, #+(and vms dec common vax) for v2.2
#-scl
(defun new-append-directories (absolute-dir relative-dir)
  ;; Version of append-directories for CLtL2-compliant lisps. In particular,
  ;; they must conform to section 23.1.3 "Structured Directories". We are
  ;; willing to fix minor aberations in this function, but not major ones.
  ;; Tested in Allegro CL 4.0 (SPARC), Allegro CL 3.1.12 (DEC 3100),
  ;; CMU CL old and new compilers, Lucid 3.0, Lucid 4.0.
  (setf absolute-dir (or absolute-dir "")
        relative-dir (or relative-dir ""))
  (let* ((abs-dir (pathname absolute-dir))
         (rel-dir (pathname relative-dir))
         (host (pathname-host abs-dir))
         (device (if (null-string absolute-dir) ; fix for CMU CL old compiler
                     (pathname-device rel-dir)
                   (pathname-device abs-dir)))
         (abs-directory (directory-to-list (pathname-directory abs-dir)))
         (abs-keyword (when (keywordp (car abs-directory))
                        (pop abs-directory)))
         ;; Stig (July 2001):
         ;; Somehow CLISP dies on the next line, but NIL is ok.
         (abs-name (ignore-errors (file-namestring abs-dir))) ; was pathname-name
         (rel-directory (directory-to-list (pathname-directory rel-dir)))
         (rel-keyword (when (keywordp (car rel-directory))
                        (pop rel-directory)))
         #-(or :MCL :gcl :sbcl :clisp :cmu) (rel-file (file-namestring rel-dir))
         ;; Stig (July 2001);
         ;; These values seems to help clisp as well
         #+(or :MCL :gcl :sbcl :clisp :cmu) (rel-name (pathname-name rel-dir))
         #+(or :MCL :gcl :sbcl :clisp :cmu) (rel-type (pathname-type rel-dir))
         (directory nil))

    ;; TI Common Lisp pathnames can return garbage for file names because
    ;; of bizarreness in the merging of defaults.  The following code makes
    ;; sure that the name is a valid name by comparing it with the
    ;; pathname-name.  It also strips TI specific extensions and handles
    ;; the necessary case conversion.  TI maps upper back into lower case
    ;; for unix files!
    #+TI (if (search (pathname-name abs-dir) abs-name :test #'string-equal)
             (setf abs-name (string-right-trim ".\x17" (string-upcase abs-name)))
             (setf abs-name nil))
    #+TI (if (search (pathname-name rel-dir) rel-file :test #'string-equal)
             (setf rel-file (string-right-trim ".\x17" (string-upcase rel-file)))
             (setf rel-file nil))
    ;; Allegro v4.0/4.1 parses "/foo" into :directory '(:absolute :root)
    ;; and filename "foo". The namestring of a pathname with
    ;; directory '(:absolute :root "foo") ignores everything after the
    ;; :root.
    #+(and allegro-version>= (version>= 4 0))
    (when (eq (car abs-directory) :root) (pop abs-directory))
    #+(and allegro-version>= (version>= 4 0))
    (when (eq (car rel-directory) :root) (pop rel-directory))

    (when (and abs-name (not (null-string abs-name))) ; was abs-name
      (cond ((and (null abs-directory) (null abs-keyword))
             #-(or :lucid TI) (setf abs-keyword (car (pathname-directory "./")))
             (setf abs-directory (list abs-name)))
            (t
             (setf abs-directory (append abs-directory (list abs-name))))))
    (when (and (null abs-directory)
               (or (null abs-keyword)
                   ;; In Lucid, an abs-dir of nil gets a keyword of
                   ;; :relative since (pathname-directory (pathname ""))
                   ;; returns (:relative) instead of nil.
                   #+:lucid (eq abs-keyword :relative))
               rel-keyword)
      ;; The following feature switches seem necessary in CMUCL
      ;; Marco Antoniotti 19990707
      #+(or :gcl :sbcl :CMU)
      (if (typep abs-dir 'logical-pathname)
          (setf abs-keyword :absolute)
          (setf abs-keyword rel-keyword))
      #-(or :gcl :sbcl :CMU)
      (setf abs-keyword rel-keyword))
    (setf directory (append abs-directory rel-directory))
    (when abs-keyword (setf directory (cons abs-keyword directory)))
    #+lispworks (when (and directory (not (symbolp (first directory)))) (setq directory (cons :relative directory)))
    (namestring
     (make-pathname :host host
                    :device device
                    :directory
                    directory
                    :name
                    #-(or :gcl :sbcl :MCL :clisp :cmu) rel-file
                    #+(or :gcl :sbcl :MCL :clisp :cmu) rel-name

                    #+(or :gcl :sbcl :MCL :clisp :cmu) :type
                    #+(or :gcl :sbcl :MCL :clisp :cmu) rel-type
                    ))))
;(trace new-append-directories)

#-scl
(defun directory-to-list (directory)
  ;; The directory should be a list, but nonstandard implementations have
  ;; been known to use a vector or even a string.
  (cond ((listp directory)
         directory)
        ((stringp directory)
         (cond ((find #\; directory)
                ;; It's probably a logical pathname, so split at the
                ;; semicolons:
                (split-string directory :item #\;))
               #+MCL
               ((and (find #\: directory)
                     (not (find #\/ directory)))
                ;; It's probably a MCL pathname, so split at the colons.
                (split-string directory :item #\:))
               (t
                ;; It's probably a unix pathname, so split at the slash.
                (split-string directory :item #\/))))
        (t
         (coerce directory 'list))))
;(trace directory-to-list)


(defparameter *append-dirs-tests*
  '("~/foo/" "baz/bar.lisp"
     "~/foo" "baz/bar.lisp"
     "/foo/bar/" "baz/barf.lisp"
     "/foo/bar/" "/baz/barf.lisp"
     "foo/bar/" "baz/barf.lisp"
     "foo/bar" "baz/barf.lisp"
     "foo/bar" "/baz/barf.lisp"
     "foo/bar/" "/baz/barf.lisp"
     "/foo/bar/" nil
     "foo/bar/" nil
     "foo/bar" nil
     "foo" nil
     "foo" ""
     nil "baz/barf.lisp"
     nil "/baz/barf.lisp"
     nil nil))

(defun test-new-append-directories (&optional (test-dirs *append-dirs-tests*))
  (do* ((dir-list test-dirs (cddr dir-list))
        (abs-dir (car dir-list) (car dir-list))
        (rel-dir (cadr dir-list) (cadr dir-list)))
      ((null dir-list) (values))
    (format t "~&ABS: ~S ~18TREL: ~S ~41TResult: ~S"
            abs-dir rel-dir (new-append-directories abs-dir rel-dir))))

#||
<cl> (test-new-append-directories)

ABS: "~/foo/"     REL: "baz/bar.lisp"    Result: "/usr0/mkant/foo/baz/bar.lisp"
ABS: "~/foo"      REL: "baz/bar.lisp"    Result: "/usr0/mkant/foo/baz/bar.lisp"
ABS: "/foo/bar/"  REL: "baz/barf.lisp"   Result: "/foo/bar/baz/barf.lisp"
ABS: "/foo/bar/"  REL: "/baz/barf.lisp"  Result: "/foo/bar/baz/barf.lisp"
ABS: "foo/bar/"   REL: "baz/barf.lisp"   Result: "foo/bar/baz/barf.lisp"
ABS: "foo/bar"    REL: "baz/barf.lisp"   Result: "foo/bar/baz/barf.lisp"
ABS: "foo/bar"    REL: "/baz/barf.lisp"  Result: "foo/bar/baz/barf.lisp"
ABS: "foo/bar/"   REL: "/baz/barf.lisp"  Result: "foo/bar/baz/barf.lisp"
ABS: "/foo/bar/"  REL: NIL               Result: "/foo/bar/"
ABS: "foo/bar/"   REL: NIL               Result: "foo/bar/"
ABS: "foo/bar"    REL: NIL               Result: "foo/bar/"
ABS: "foo"        REL: NIL               Result: "foo/"
ABS: "foo"        REL: ""                Result: "foo/"
ABS: NIL          REL: "baz/barf.lisp"   Result: "baz/barf.lisp"
ABS: NIL          REL: "/baz/barf.lisp"  Result: "/baz/barf.lisp"
ABS: NIL          REL: NIL               Result: ""

||#

(defun append-directories (absolute-directory relative-directory)
  "There is no CL primitive for tacking a subdirectory onto a directory.
   We need such a function because defsystem has both absolute and
   relative pathnames in the modules. This is a somewhat ugly hack which
   seems to work most of the time. We assume that ABSOLUTE-DIRECTORY
   is a directory, with no filename stuck on the end. Relative-directory,
   however, may have a filename stuck on the end."
  (when (or absolute-directory relative-directory)
    (cond
     ;; KMR commented out because: when appending two logical pathnames,
     ;; using this code translates the first logical pathname then appends
     ;; the second logical pathname -- an error.
     #|
      ;; We need a reliable way to determine if a pathname is logical.
      ;; Allegro 4.1 does not recognize the syntax of a logical pathname
      ;;  as being logical unless its logical host is already defined.

      #+(or (and allegro-version>= (version>= 4 1))
            :logical-pathnames-mk)
      ((and absolute-directory
            (logical-pathname-p absolute-directory)
            relative-directory)
       ;; For use with logical pathnames package.
       (append-logical-directories-mk absolute-directory relative-directory))
      |#
      #-scl
      ((namestring-probably-logical absolute-directory)
       ;; A simplistic stab at handling logical pathnames
       (append-logical-pnames absolute-directory relative-directory))
      #-scl
      (t
       ;; In VMS, merge-pathnames actually does what we want!!!
       #+:VMS
       (namestring (merge-pathnames (or absolute-directory "")
                                    (or relative-directory "")))
       #+:macl1.3.2
       (namestring (make-pathname :directory absolute-directory
                                  :name relative-directory))
       ;; Cross your fingers and pray.
       #-(or :VMS :macl1.3.2)
       (new-append-directories absolute-directory relative-directory))
      #+scl
      (t
       (let ((absolute (pathname (or absolute-directory ""))))
         (when (or (pathname-name absolute) (pathname-type absolute))
           (let* ((directory (or (pathname-directory absolute) '(:relative)))
                  (directory (append directory (list (file-namestring absolute)))))
             (setf absolute (make-pathname :directory directory
                                           :name nil
                                           :type nil
                                           :version nil
                                           :defaults absolute))))
         (ext:resolve-pathname (or relative-directory "")
                               absolute))))))
      

#+:logical-pathnames-mk
(defun append-logical-directories-mk (absolute-dir relative-dir)
  (lp:append-logical-directories absolute-dir relative-dir))


;;; append-logical-pathnames-mk --
;;; The following is probably still bogus and it does not solve the
;;; problem of appending two logical pathnames.
;;; Anyway, as per suggetsion by KMR, the function is not called
;;; anymore.
;;; Hopefully this will not cause problems for ACL.

#+(and (and allegro-version>= (version>= 4 1))
       (not :logical-pathnames-mk))
(defun append-logical-directories-mk (absolute-dir relative-dir)
  ;; We know absolute-dir and relative-dir are non nil.  Moreover
  ;; absolute-dir is a logical pathname.
  (setq absolute-dir (logical-pathname absolute-dir))
  (etypecase relative-dir
    (string (setq relative-dir (parse-namestring relative-dir)))
    (pathname #| do nothing |#))

  (translate-logical-pathname
   (merge-pathnames relative-dir absolute-dir)))

#| Old version 2002-03-02
#+(and (and allegro-version>= (version>= 4 1))
       (not :logical-pathnames-mk))
(defun append-logical-directories-mk (absolute-dir relative-dir)
  ;; We know absolute-dir and relative-dir are non nil.  Moreover
  ;; absolute-dir is a logical pathname.
  (setq absolute-dir (logical-pathname absolute-dir))
  (etypecase relative-dir
    (string (setq relative-dir (parse-namestring relative-dir)))
    (pathname #| do nothing |#))

  (translate-logical-pathname
   (make-pathname
    :host (or (pathname-host absolute-dir)
              (pathname-host relative-dir))
    :directory (append (pathname-directory absolute-dir)
                       (cdr (pathname-directory relative-dir)))
    :name (or (pathname-name absolute-dir)
              (pathname-name relative-dir))
    :type (or (pathname-type absolute-dir)
              (pathname-type relative-dir))
    :version (or (pathname-version absolute-dir)
                 (pathname-version relative-dir)))))

;; Old version
#+(and (and allegro-version>= (version>= 4 1))
       (not :logical-pathnames-mk))
(defun append-logical-directories-mk (absolute-dir relative-dir)
  (when (or absolute-dir relative-dir)
    (setq absolute-dir (logical-pathname (or absolute-dir ""))
          relative-dir (logical-pathname (or relative-dir "")))
    (translate-logical-pathname
     (make-pathname
      :host (or (pathname-host absolute-dir)
                (pathname-host relative-dir))
      :directory (append (pathname-directory absolute-dir)
                         (cdr (pathname-directory relative-dir)))
      :name (or (pathname-name absolute-dir)
                (pathname-name relative-dir))
      :type (or (pathname-type absolute-dir)
                (pathname-type relative-dir))
      :version (or (pathname-version absolute-dir)
                   (pathname-version relative-dir))))))
|#

;;; determines if string or pathname object is logical
#+:logical-pathnames-mk
(defun logical-pathname-p (thing)
  (eq (lp:pathname-host-type thing) :logical))

;;; From Kevin Layer for 4.1final.
#+(and (and allegro-version>= (version>= 4 1))
       (not :logical-pathnames-mk))
(defun logical-pathname-p (thing)
  (typep (parse-namestring thing) 'logical-pathname))

#-scl
(defun pathname-logical-p (thing)
  (typecase thing
    (logical-pathname t)
    #+clisp ; CLisp has non conformant Logical Pathnames.
    (pathname (pathname-logical-p (namestring thing)))
    (string (and (= 1 (count #\: thing)) ; Shortcut.
                 (ignore-errors (translate-logical-pathname thing))
                 t))
    (t nil)))

;;; This affects only one thing.
;;; 19990707 Marco Antoniotti
;;; old version

#-scl
(defun namestring-probably-logical (namestring)
  (and (stringp namestring)
       ;; unix pathnames don't have embedded semicolons
       (find #\; namestring)))
#||
;;; New version
(defun namestring-probably-logical (namestring)
  (and (stringp namestring)
       (typep (parse-namestring namestring) 'logical-pathname)))


;;; New new version
;;; 20000321 Marco Antoniotti
(defun namestring-probably-logical (namestring)
  (pathname-logical-p namestring))
||#


#|| This is incorrect, as it strives to keep strings around, when it
    shouldn't.  MERGE-PATHNAMES already DTRT.
(defun append-logical-pnames (absolute relative)
  (declare (type (or null string pathname) absolute relative))
  (let ((abs (if absolute
                 #-clisp (namestring absolute)
                 #+clisp absolute ;; Stig (July 2001): hack to avoid CLISP from translating the whole string
                 ""))
        (rel (if relative (namestring relative) ""))
        )
    ;; Make sure the absolute directory ends with a semicolon unless
    ;; the pieces are null strings
    (unless (or (null-string abs) (null-string rel)
                (char= (char abs (1- (length abs)))
                       #\;))
      (setq abs (concatenate 'string abs ";")))
    ;; Return the concatenate pathnames
    (concatenate 'string abs rel)))
||#


#-scl
(defun append-logical-pnames (absolute relative)
  (declare (type (or null string pathname) absolute relative))
  (let ((abs (if absolute
                 (pathname absolute)
                 (make-pathname :directory (list :absolute)
                                :name nil
                                :type nil)
                 ))
        (rel (if relative
                 (pathname relative)
                 (make-pathname :directory (list :relative)
                                :name nil
                                :type nil)
                 ))
        )
    ;; The following is messed up because CMUCL and LW use different
    ;; defaults for host (in particular LW uses NIL).  Thus
    ;; MERGE-PATHNAMES has legitimate different behaviors on both
    ;; implementations. Of course this is disgusting, but that is the
    ;; way it is and the rest tries to circumvent this crap.
    (etypecase abs
      (logical-pathname
       (etypecase rel
         (logical-pathname
          (namestring (merge-pathnames rel abs)))
         (pathname
          ;; The following potentially translates the logical pathname
          ;; very early, but we cannot avoid it.
          (namestring (merge-pathnames rel (translate-logical-pathname abs))))
         ))
      (pathname
       (namestring (merge-pathnames rel abs)))
      )))

#||
;;; This was a try at appending a subdirectory onto a directory.
;;; It failed. We're keeping this around to prevent future mistakes
;;; of a similar sort.
(defun merge-directories (absolute-directory relative-directory)
  ;; replace concatenate with something more intelligent
  ;; i.e., concatenation won't work with some directories.
  ;; it should also behave well if the parent directory
  ;; has a filename at the end, or if the relative-directory ain't relative
  (when absolute-directory
    (setq absolute-directory (pathname-directory absolute-directory)))
  (concatenate 'string
               (or absolute-directory "")
               (or relative-directory "")))
||#

#||
<cl> (defun d (d n) (namestring (make-pathname :directory d :name n)))

D
<cl> (d "~/foo/" "baz/bar.lisp")
"/usr0/mkant/foo/baz/bar.lisp"

<cl> (d "~/foo" "baz/bar.lisp")
"/usr0/mkant/foo/baz/bar.lisp"

<cl> (d "/foo/bar/" "baz/barf.lisp")
"/foo/bar/baz/barf.lisp"

<cl> (d "foo/bar/" "baz/barf.lisp")
"foo/bar/baz/barf.lisp"

<cl> (d "foo/bar" "baz/barf.lisp")
"foo/bar/baz/barf.lisp"

<cl> (d "foo/bar" "/baz/barf.lisp")
"foo/bar//baz/barf.lisp"

<cl> (d "foo/bar" nil)
"foo/bar/"

<cl> (d nil "baz/barf.lisp")
"baz/barf.lisp"

<cl> (d nil nil)
""

||#

(defun new-file-type (pathname type)
  (make-pathname :type type :defaults pathname))


;;; ********************************
;;; Component Defstruct ************
;;; ********************************
(defvar *source-pathname-default* nil
  "Default value of :source-pathname keyword in DEFSYSTEM. Set this to
   \"\" to avoid having to type :source-pathname \"\" all the time.")

(defvar *binary-pathname-default* nil
  "Default value of :binary-pathname keyword in DEFSYSTEM.")

;;; Removed TIME slot, which has been made unnecessary by the new definition
;;; of topological-sort.

(defstruct (topological-sort-node (:conc-name topsort-))
  (color :white :type (member :gray :black :white))
  ;; time
  )

(defstruct (component (:include topological-sort-node)
                      (:print-function print-component))
  (type :file     ; to pacify the CMUCL compiler (:type is alway supplied)
        :type (member :defsystem
                      :system
                      :subsystem
                      :module
                      :file
                      :private-file
                      ))
  (name nil :type (or symbol string))
  (indent 0 :type (mod 1024))           ; Number of characters of indent in
                                        ; verbose output to the user.
  host                                  ; The pathname host (i.e., "/../a").
  device                                ; The pathname device.
  source-root-dir                       ; Relative or absolute (starts
                                        ; with "/"), directory or file
                                        ; (ends with "/").
  (source-pathname *source-pathname-default*)
  source-extension                      ; A string, e.g., "lisp"
                                        ; if NIL, inherit
  (binary-pathname *binary-pathname-default*)
  binary-root-dir
  binary-extension                      ; A string, e.g., "fasl". If
                                        ; NIL, uses default for
                                        ; machine-type.
  package                               ; Package for use-package.

  ;; The following three slots are used to provide for alternate compilation
  ;; and loading functions for the files contained within a component. If
  ;; a component has a compiler or a loader specified, those functions are
  ;; used. Otherwise the functions are derived from the language. If no
  ;; language is specified, it defaults to Common Lisp (:lisp). Other current
  ;; possible languages include :scheme (PseudoScheme) and :c, but the user
  ;; can define additional language mappings. Compilation functions should
  ;; accept a pathname argument and a :output-file keyword; loading functions
  ;; just a pathname argument. The default functions are #'compile-file and
  ;; #'load. Unlike fdmm's SET-LANGUAGE macro, this allows a defsystem to
  ;; mix languages.
  (language nil :type (or null symbol))
  (compiler nil :type (or null symbol function))
  (loader   nil :type (or null symbol function))
  (compiler-options nil :type list)     ; A list of compiler options to
                                        ; use for compiling this
                                        ; component.  These must be
                                        ; keyword options supported by
                                        ; the compiler.

  (components () :type list)            ; A list of components
                                        ; comprising this component's
                                        ; definition.
  (depends-on () :type list)            ; A list of the components
                                        ; this one depends on. may
                                        ; refer only to the components
                                        ; at the same level as this
                                        ; one.
  proclamations                         ; Compiler options, such as
                                        ; '(optimize (safety 3)).
  initially-do                          ; Form to evaluate before the
                                        ; operation.
  finally-do                            ; Form to evaluate after the operation.
  compile-form                          ; For foreign libraries.
  load-form                             ; For foreign libraries.

  ;; load-time                          ; The file-write-date of the
                                        ; binary/source file loaded.

  ;; If load-only is T, will not compile the file on operation :compile.
  ;; In other words, for files which are :load-only T, loading the file
  ;; satisfies any demand to recompile.
  load-only                             ; If T, will not compile this
                                        ; file on operation :compile.
  ;; If compile-only is T, will not load the file on operation :compile.
  ;; Either compiles or loads the file, but not both. In other words,
  ;; compiling the file satisfies the demand to load it. This is useful
  ;; for PCL defmethod and defclass definitions, which wrap a
  ;; (eval-when (compile load eval) ...) around the body of the definition.
  ;; This saves time in some lisps.
  compile-only                          ; If T, will not load this
                                        ; file on operation :compile.
  #|| ISI Extension ||#
  load-always                           ; If T, will force loading
                                        ; even if file has not
                                        ; changed.
  ;; PVE: add banner
  (banner nil :type (or null string))

  (documentation nil :type (or null string)) ; Optional documentation slot
  )


;;; To allow dependencies from "foreign systems" like ASDF or one of
;;; the proprietary ones like ACL or LW.

(defstruct (foreign-system (:include component (type :system)))
  kind ; This is a keyword: (member :asdf :pcl :lispworks-common-defsystem ...)
  object ; The actual foreign system object.
  )


(defun register-foreign-system (name &key representation kind)
  (declare (type (or symbol string) name))
  (let ((fs (make-foreign-system :name name
                                 :kind kind
                                 :object representation)))
    (setf (get-system name) fs)))



(define-condition missing-component (simple-condition)
  ((name :reader missing-component-name
         :initarg :name)
   (component :reader missing-component-component
              :initarg :component)
   )
  #-gcl(:default-initargs :component nil)
  (:report (lambda (mmc stream)
             (format stream "MK:DEFSYSTEM: missing component ~S for ~S."
                     (missing-component-name mmc)
                     (missing-component-component mmc))))
  )

(define-condition missing-module (missing-component)
  ()
  (:report (lambda (mmc stream)
             (format stream "MK:DEFSYSTEM: missing module ~S for ~S."
                     (missing-component-name mmc)
                     (missing-component-component mmc))))
  )

(define-condition missing-system (missing-module)
  ()
  (:report (lambda (msc stream)
             (format stream "MK:DEFSYSTEM: missing system ~S~@[ for S~]."
                     (missing-component-name msc)
                     (missing-component-component msc))))
  )



(defvar *file-load-time-table* (make-hash-table :test #'equal)
  "Hash table of file-write-dates for the system definitions and
   files in the system definitions.")
(defun component-load-time (component)
  (when component
    (etypecase component
      (string    (gethash component *file-load-time-table*))
      (pathname (gethash (namestring component) *file-load-time-table*))
      (component
       (ecase (component-type component)
         (:defsystem
          (let* ((name (component-name component))
                 (path (when name (compute-system-path name nil))))
            (declare (type (or string pathname null) path))
            (when path
              (gethash (namestring path) *file-load-time-table*))))
         ((:file :private-file)
          ;; Use only :source pathname to identify component's
          ;; load time.
          (let ((path (component-full-pathname component :source)))
            (when path
              (gethash path *file-load-time-table*)))))))))

#-(or :cmu :scl)
(defsetf component-load-time (component) (value)
  `(when ,component
    (etypecase ,component
      (string   (setf (gethash ,component *file-load-time-table*) ,value))
      (pathname (setf (gethash (namestring (the pathname ,component))
                               *file-load-time-table*)
                      ,value))
      (component
       (ecase (component-type ,component)
         (:defsystem
          (let* ((name (component-name ,component))
                 (path (when name (compute-system-path name nil))))
            (declare (type (or string pathname null) path))
            (when path
              (setf (gethash (namestring path) *file-load-time-table*)
                    ,value))))
         ((:file :private-file)
          ;; Use only :source pathname to identify file.
          (let ((path (component-full-pathname ,component :source)))
            (when path
              (setf (gethash path *file-load-time-table*)
                    ,value)))))))
    ,value))

#+(or :cmu :scl)
(defun (setf component-load-time) (value component)
  (declare
   (type (or null string pathname component) component)
   (type (or unsigned-byte null) value))
  (when component
    (etypecase component
      (string   (setf (gethash component *file-load-time-table*) value))
      (pathname (setf (gethash (namestring (the pathname component))
                               *file-load-time-table*)
                      value))
      (component
       (ecase (component-type component)
         (:defsystem
             (let* ((name (component-name component))
                    (path (when name (compute-system-path name nil))))
               (declare (type (or string pathname null) path))
               (when path
                 (setf (gethash (namestring path) *file-load-time-table*)
                       value))))
         ((:file :private-file)
          ;; Use only :source pathname to identify file.
          (let ((path (component-full-pathname component :source)))
            (when path
              (setf (gethash path *file-load-time-table*)
                    value)))))))
    value))


;;; compute-system-path --

(defun compute-system-path (module-name definition-pname)
  (let* ((module-string-name
          (etypecase module-name
            (symbol (string-downcase
                     (string module-name)))
            (string module-name)))

         (file-pathname
          (make-pathname :name module-string-name
                         :type *system-extension*))

         (lib-file-pathname
          (make-pathname ;:directory (list :relative module-string-name)
                         :name module-string-name
                         :type *system-extension*))
         )
    (or (when definition-pname          ; given pathname for system def
          (probe-file definition-pname))
        ;; Then the central registry. Note that we also check the current
        ;; directory in the registry, but the above check is hard-coded.
        (cond (*central-registry*
               (if (listp *central-registry*)
                   (dolist (registry *central-registry*)
                     (let ((file (or (probe-file
                                      (append-directories (if (consp registry)
                                                              (eval registry)
                                                              registry)
                                                          file-pathname))
                                     (probe-file
                                      (append-directories (if (consp registry)
                                                              (eval registry)
                                                              registry)
                                                          lib-file-pathname))
                                     ))
                           )
                       (when file (return file))))
                   (or (probe-file (append-directories *central-registry*
                                                       file-pathname))
                       (probe-file (append-directories *central-registry*
                                                       lib-file-pathname))
                       ))
               )
              (t
               ;; No central registry. Assume current working directory.
               ;; Maybe this should be an error?
               (or (probe-file file-pathname)
                   (probe-file lib-file-pathname)))))
    ))


(defun system-definition-pathname (system-name)
  (let ((system (ignore-errors (find-system system-name :error))))
    (if system
        (let ((system-def-pathname
               (make-pathname :type "system"
                              :defaults (pathname (component-full-pathname system :source))))
              )
          (values system-def-pathname
                  (probe-file system-def-pathname)))
        (values nil nil))))




#|

(defun compute-system-path (module-name definition-pname)
  (let* ((filename (format nil "~A.~A"
                           (if (symbolp module-name)
                               (string-downcase (string module-name))
                             module-name)
                           *system-extension*)))
    (or (when definition-pname          ; given pathname for system def
          (probe-file definition-pname))
        ;; Then the central registry. Note that we also check the current
        ;; directory in the registry, but the above check is hard-coded.
        (cond (*central-registry*
               (if (listp *central-registry*)
                   (dolist (registry *central-registry*)
                     (let ((file (probe-file
                                  (append-directories (if (consp registry)
                                                          (eval registry)
                                                        registry)
                                                      filename))))
                       (when file (return file))))
                 (probe-file (append-directories *central-registry*
                                                 filename))))
              (t
               ;; No central registry. Assume current working directory.
               ;; Maybe this should be an error?
               (probe-file filename))))))
|#


(defvar *reload-systems-from-disk* t
  "If T, always tries to reload newer system definitions from disk.
   Otherwise first tries to find the system definition in the current
   environment.")

(defun find-system (system-name &optional (mode :ask) definition-pname)
  "Returns the system named SYSTEM-NAME.
If not already loaded, loads it, depending on the value of
*RELOAD-SYSTEMS-FROM-DISK* and of the value of MODE. MODE can be :ASK,
:ERROR, :LOAD-OR-NIL, or :LOAD. :ASK is the default.
This allows OPERATE-ON-SYSTEM to work on non-loaded as well as
loaded system definitions. DEFINITION-PNAME is the pathname for
the system definition, if provided."
  (ecase mode
    (:ask
     (or (get-system system-name)
         (when (y-or-n-p-wait
                #\y 20
                "System ~A not loaded. Shall I try loading it? "
                system-name)
           (find-system system-name :load definition-pname))))
    (:error
     (or (get-system system-name)
         (error 'missing-system :name system-name)))
    (:load-or-nil
     (let ((system (get-system system-name)))
       (or (unless *reload-systems-from-disk* system)
           ;; If SYSTEM-NAME is a symbol, it will lowercase the
           ;; symbol's string.
           ;; If SYSTEM-NAME is a string, it doesn't change the case of the
           ;; string. So if case matters in the filename, use strings, not
           ;; symbols, wherever the system is named.
           (when (foreign-system-p system)
             (warn "Foreing system ~S cannot be reloaded by MK:DEFSYSTEM." system)
             (return-from find-system nil))
           (let ((path (compute-system-path system-name definition-pname)))
             (when (and path
                        (or (null system)
                            (null (component-load-time path))
                            (< (component-load-time path)
                               (file-write-date path))))
               (tell-user-generic
                (format nil "Loading system ~A from file ~A"
                        system-name
                        path))
               (load path)
               (setf system (get-system system-name))
               (when system
                 (setf (component-load-time path)
                       (file-write-date path))))
             system)
           system)))
    (:load
     (or (unless *reload-systems-from-disk* (get-system system-name))
         (when (foreign-system-p (get-system system-name))
           (warn "Foreign system ~S cannot be reloaded by MK:DEFSYSTEM." system-name)
           (return-from find-system nil))
         (or (find-system system-name :load-or-nil definition-pname)
             (error "Can't find system named ~s." system-name))))))


(defun print-component (component stream depth)
  (declare (ignore depth))
  (format stream "#<~:@(~A~): ~A>"
          (component-type component)
          (component-name component)))


(defun describe-system (name &optional (stream *standard-output*))
  "Prints a description of the system to the stream. If NAME is the
   name of a system, gets it and prints a description of the system.
   If NAME is a component, prints a description of the component."
  (let ((system (if (typep name 'component) name (find-system name :load))))
    (format stream "~&~A ~A: ~
                    ~@[~&   Host: ~A~]~
                    ~@[~&   Device: ~A~]~
                    ~@[~&   Package: ~A~]~
                    ~&   Source: ~@[~A~] ~@[~A~] ~@[~A~]~
                    ~&   Binary: ~@[~A~] ~@[~A~] ~@[~A~]~
                    ~@[~&   Depends On: ~A ~]~&   Components:~{~15T~A~&~}"
            (component-type system)
            (component-name system)
            (component-host system)
            (component-device system)
            (component-package system)
            (component-root-dir system :source)
            (component-pathname system :source)
            (component-extension system :source)
            (component-root-dir system :binary)
            (component-pathname system :binary)
            (component-extension system :binary)
            (component-depends-on system)
            (component-components system))
    #||(when recursive
      (dolist (component (component-components system))
        (describe-system component stream recursive)))||#
    system))

(defun canonicalize-component-name (component)
  ;; Within the component, the name is a string.
  (if (typep (component-name component) 'string)
      ;; Unnecessary to change it, so just return it, same case
      (component-name component)
    ;; Otherwise, make it a downcase string -- important since file
    ;; names are often constructed from component names, and unix
    ;; prefers lowercase as a default.
    (setf (component-name component)
          (string-downcase (string (component-name component))))))

(defun component-pathname (component type)
  (when component
    (ecase type
      (:source (component-source-pathname component))
      (:binary (component-binary-pathname component))
      (:error  (component-error-pathname component)))))
(defun component-error-pathname (component)
  (let ((binary (component-pathname component :binary)))
    (new-file-type binary *compile-error-file-type*)))
(defsetf component-pathname (component type) (value)
  `(when ,component
     (ecase ,type
       (:source (setf (component-source-pathname ,component) ,value))
       (:binary (setf (component-binary-pathname ,component) ,value)))))

(defun component-root-dir (component type)
  (when component
    (ecase type
      (:source (component-source-root-dir component))
      ((:binary :error) (component-binary-root-dir component))
      )))
(defsetf component-root-dir (component type) (value)
  `(when ,component
     (ecase ,type
       (:source (setf (component-source-root-dir ,component) ,value))
       (:binary (setf (component-binary-root-dir ,component) ,value)))))

(defvar *source-pathnames-table* (make-hash-table :test #'equal)
  "Table which maps from components to full source pathnames.")
(defvar *binary-pathnames-table* (make-hash-table :test #'equal)
  "Table which maps from cosmponents to full binary pathnames.")
(defparameter *reset-full-pathname-table* t
  "If T, clears the full-pathname tables before each call to
   OPERATE-ON-SYSTEM. Setting this to NIL may yield faster performance
   after multiple calls to LOAD-SYSTEM and COMPILE-SYSTEM, but could
   result in changes to system and language definitions to not take
   effect, and so should be used with caution.")
(defun clear-full-pathname-tables ()
  (clrhash *source-pathnames-table*)
  (clrhash *binary-pathnames-table*))

(defun component-full-pathname (component type &optional (version *version*))
  (when component
    (case type
      (:source
       (let ((old (gethash component *source-pathnames-table*)))
         (or old
             (let ((new (component-full-pathname-i component type version)))
               (setf (gethash component *source-pathnames-table*) new)
               new))))
      (:binary
        (let ((old (gethash component *binary-pathnames-table*)))
         (or old
             (let ((new (component-full-pathname-i component type version)))
               (setf (gethash component *binary-pathnames-table*) new)
               new))))
      (otherwise
       (component-full-pathname-i component type version)))))

(defun component-full-pathname-i (component type
                                            &optional (version *version*)
                                            &aux version-dir version-replace)
  ;; If the pathname-type is :binary and the root pathname is null,
  ;; distribute the binaries among the sources (= use :source pathname).
  ;; This assumes that the component's :source pathname has been set
  ;; before the :binary one.
  (if version
      (multiple-value-setq (version-dir version-replace)
        (translate-version version))
      (setq version-dir *version-dir* version-replace *version-replace*))
  ;; (format *trace-output* "~&>>>> VERSION COMPUTED ~S ~S~%" version-dir version-replace)
  (let ((pathname
         (append-directories
          (if version-replace
              version-dir
              (append-directories (component-root-dir component type)
                                  version-dir))
          (component-pathname component type))))

    ;; When a logical pathname is used, it must first be translated to
    ;; a physical pathname. This isn't strictly correct. What should happen
    ;; is we fill in the appropriate slots of the logical pathname, and
    ;; then return the logical pathname for use by compile-file & friends.
    ;; But calling translate-logical-pathname to return the actual pathname
    ;; should do for now.

    ;; (format t "pathname = ~A~%" pathname)
    ;; (format t "type = ~S~%" (component-extension component type))

    ;; 20000303 Marco Antoniotti
    ;; Changed the following according to suggestion by Ray Toy.  I
    ;; just collapsed the tests for "logical-pathname-ness" into a
    ;; single test (heavy, but probably very portable) and added the
    ;; :name argument to the MAKE-PATHNAME in the MERGE-PATHNAMES
    ;; beacuse of possible null names (e.g. :defsystem components)
    ;; causing problems with the subsequenct call to NAMESTRING.
    ;; (format *trace-output* "~&>>>> PATHNAME is ~S~%" pathname)
    (cond #-scl
          ((pathname-logical-p pathname) ; See definition of test above.
           (setf pathname
                 (merge-pathnames pathname
                                  (make-pathname
                                   :name (component-name component)
                                   :type (component-extension component
                                                              type))))
           ;;(format t "new path = ~A~%" pathname)
           (namestring (translate-logical-pathname pathname)))
          #-scl
          (t
           (namestring
            (make-pathname :host (when (component-host component)
                                   ;; MCL2.0b1 and ACLPC cause an error on
                                   ;; (pathname-host nil)
                                   #+sbcl
                                   (component-host component)
                                   #+openmcl
                                   (component-host (if (eq component :unspecific) "" component))
                                   #-(or :sbcl :openmcl)
                                   (pathname-host (component-host component)))
                           :directory (pathname-directory pathname)
                           ;; Use :directory instead of :defaults
                           :name (pathname-name pathname)
                           :type (component-extension component type)
                           :device
                           #+sbcl
                           :unspecific
                           #-(or :sbcl)
                           (let ((dev (component-device component)))
                             (if dev
                                 (pathname-device dev
                                                  #+scl :case #+scl :common
                                                  )
                                 (pathname-device pathname
                                                  #+scl :case #+scl :common
                                                  )))
                           ;; :version :newest
                           )))
          #+scl
          (t
           (make-pathname
            :name (component-name component)
            :type (component-extension component type)
            :defaults pathname
            :case :uri)))))

;;; What about CMU17 :device :unspecific in the above?

#-lispworks
(defun translate-version (version)
  ;; Value returns the version directory and whether it replaces
  ;; the entire root (t) or is a subdirectory.
  ;; Version may be nil to signify no subdirectory,
  ;; a symbol, such as alpha, beta, omega, :alpha, mark, which
  ;; specifies a subdirectory of the root, or
  ;; a string, which replaces the root.
  (cond ((null version)
         (values "" nil))
        ((symbolp version)
         (values (let ((sversion (string version)))
                   (if (find-if #'lower-case-p sversion)
                       sversion
                       (string-downcase sversion)))
                 nil))
        ((stringp version)
         (values version t))
        (t (error "~&; Illegal version ~S" version))))


;;; Looks like LW has a bug in MERGE-PATHNAMES.
;;;
;;;  (merge-pathnames "" "LP:foo;bar;") ==> "LP:"
;;;
;;; Which is incorrect.
;;; The change here ensures that the result of TRANSLATE-VERSION is
;;; appropriate.

#+lispworks
(defun translate-version (version)
  ;; Value returns the version directory and whether it replaces
  ;; the entire root (t) or is a subdirectory.
  ;; Version may be nil to signify no subdirectory,
  ;; a symbol, such as alpha, beta, omega, :alpha, mark, which
  ;; specifies a subdirectory of the root, or
  ;; a string, which replaces the root.
  (cond ((null version)
         (values (pathname "") nil))
        ((symbolp version)
         (values (let ((sversion (string version)))
                   (if (find-if #'lower-case-p sversion)
                       (pathname sversion)
                       (pathname (string-downcase sversion))))
                 nil))
        ((stringp version)
         (values (pathname version) t))
        (t (error "~&; Illegal version ~S" version))))




(defun component-extension (component type &key local)
  (ecase type
    (:source (or (component-source-extension component)
                 (unless local
                   (default-source-extension component)) ; system default
                 ;; (and (component-language component))
                 ))
    (:binary (or (component-binary-extension component)
                 (unless local
                   (default-binary-extension component)) ; system default
                 ;; (and (component-language component))
                 ))
    (:error  *compile-error-file-type*)))


(defsetf component-extension (component type) (value)
  `(ecase ,type
     (:source (setf (component-source-extension ,component) ,value))
     (:binary (setf (component-binary-extension ,component) ,value))
     (:error  (setf *compile-error-file-type* ,value))))

;;; ********************************
;;; System Definition **************
;;; ********************************
(defun create-component (type name definition-body &optional parent (indent 0))
  (let ((component (apply #'make-component
                          :type type
                          :name name
                          :indent indent
                          definition-body)))
    ;; Set up :load-only attribute
    (unless (find :load-only definition-body)
      ;; If the :load-only attribute wasn't specified,
      ;; inherit it from the parent. If no parent, default it to nil.
      (setf (component-load-only component)
            (when parent
              (component-load-only parent))))
    ;; Set up :compile-only attribute
    (unless (find :compile-only definition-body)
      ;; If the :compile-only attribute wasn't specified,
      ;; inherit it from the parent. If no parent, default it to nil.
      (setf (component-compile-only component)
            (when parent
              (component-compile-only parent))))

    ;; Set up :compiler-options attribute
    (unless (find :compiler-options definition-body)
      ;; If the :compiler-option attribute wasn't specified,
      ;; inherit it from the parent.  If no parent, default it to NIL.
      (setf (component-compiler-options component)
            (when parent
              (component-compiler-options parent))))

    #|| ISI Extension ||#
    ;; Set up :load-always attribute
    (unless (find :load-always definition-body)
      ;; If the :load-always attribute wasn't specified,
      ;; inherit it from the parent. If no parent, default it to nil.
      (setf (component-load-always component)
            (when parent
              (component-load-always parent))))

    ;; Initializations/after makes
    (canonicalize-component-name component)

    ;; Inherit package from parent if not specified.
    (setf (component-package component)
          (or (component-package component)
              (when parent (component-package parent))))

    ;; Type specific setup:
    (when (or (eq type :defsystem) (eq type :system) (eq type :subsystem))
      (setf (get-system name) component)
      #|(unless (component-language component)
        (setf (component-language component) :lisp))|#)

    ;; Set up the component's pathname
    (create-component-pathnames component parent)

    ;; If there are any components of the component, expand them too.
    (expand-component-components component (+ indent 2))

    ;; Make depends-on refer to structs instead of names.
    (link-component-depends-on (component-components component))

    ;; Design Decision: Topologically sort the dependency graph at
    ;; time of definition instead of at time of use. Probably saves a
    ;; little bit of time for the user.

    ;; Topological Sort the components at this level.
    (setf (component-components component)
          (topological-sort (component-components component)))

    ;; Return the component.
    component))


;;; defsystem --
;;; The main macro.
;;;
;;; 2002-11-22 Marco Antoniotti
;;; Added code to achieve a first cut "pathname less" operation,
;;; following the ideas in ASDF.  If the DEFSYSTEM form is loaded from
;;; a file, then the location of the file (intended as a directory) is
;;; computed from *LOAD-PATHNAME* and stored as the :SOURCE-PATHNAME
;;; of the system.

(defmacro defsystem (name &rest definition-body)
  (unless (find :source-pathname definition-body)
    (setf definition-body
          (list* :source-pathname
                 '(when #-gcl *load-pathname* #+gcl si::*load-pathname*
                        (make-pathname :name nil
                                       :type nil
                                       :defaults #-gcl *load-pathname* 
                                                 #+gcl si::*load-pathname*))
                 definition-body)))
  `(create-component :defsystem ',name ',definition-body nil 0))

(defun create-component-pathnames (component parent)
  ;; Set up language-specific defaults

  (setf (component-language component)
        (or (component-language component) ; for local defaulting
            (when parent                ; parent's default
              (component-language parent))))

  (setf (component-compiler component)
        (or (component-compiler component) ; for local defaulting
            (when parent                ; parent's default
              (component-compiler parent))))
  (setf (component-loader component)
        (or (component-loader component) ; for local defaulting
            (when parent                ; parent's default
              (component-loader parent))))

  ;; Evaluate the root dir arg
  (setf (component-root-dir component :source)
        (eval (component-root-dir component :source)))
  (setf (component-root-dir component :binary)
        (eval (component-root-dir component :binary)))

  ;; Evaluate the pathname arg
  (setf (component-pathname component :source)
        (eval (component-pathname component :source)))
  (setf (component-pathname component :binary)
        (eval (component-pathname component :binary)))

  ;; Pass along the host and devices
  (setf (component-host component)
        (or (component-host component)
            (when parent (component-host parent))
            (pathname-host *default-pathname-defaults*)))
  (setf (component-device component)
        (or (component-device component)
            (when parent (component-device parent))))

  ;; Set up extension defaults
  (setf (component-extension component :source)
        (or (component-extension component :source
                                 :local #| (component-language component) |#
                                 t
                                 ) ; local default
            (when (component-language component)
              (default-source-extension component))
            (when parent                ; parent's default
              (component-extension parent :source))))
  (setf (component-extension component :binary)
        (or (component-extension component :binary
                                 :local #| (component-language component) |#
                                 t
                                 ) ; local default
            (when (component-language component)
              (default-binary-extension component))
            (when parent                ; parent's default
              (component-extension parent :binary))))

  ;; Set up pathname defaults -- expand with parent
  ;; We must set up the source pathname before the binary pathname
  ;; to allow distribution of binaries among the sources to work.
  (generate-component-pathname component parent :source)
  (generate-component-pathname component parent :binary))


;; maybe file's inheriting of pathnames should be moved elsewhere?
(defun generate-component-pathname (component parent pathname-type)
  ;; Pieces together a pathname for the component based on its component-type.
  ;; Assumes source defined first.
  ;; Null binary pathnames inherit from source instead of the component's
  ;; name. This allows binaries to be distributed among the source if
  ;; binary pathnames are not specified. Or if the root directory is
  ;; specified for binaries, but no module directories, it inherits
  ;; parallel directory structure.
  (case (component-type component)
    ((:defsystem :system)               ; Absolute Pathname
     ;; Set the root-dir to be the absolute pathname
     (setf (component-root-dir component pathname-type)
           (or (component-pathname component pathname-type)
               (when (eq pathname-type :binary)
                 ;; When the binary root is nil, use source.
                 (component-root-dir component :source))) )
     ;; Set the relative pathname to be nil
     (setf (component-pathname component pathname-type)
           nil));; should this be "" instead?
    ;; If the name of the component-pathname is nil, it
    ;; defaults to the name of the component. Use "" to
    ;; avoid this defaulting.
    (:private-file                      ; Absolute Pathname
     ;; Root-dir is the directory part of the pathname
     (setf (component-root-dir component pathname-type)
           ""
           #+ignore(or (when (component-pathname component pathname-type)
                         (pathname-directory
                          (component-pathname component pathname-type)))
                       (when (eq pathname-type :binary)
                         ;; When the binary root is nil, use source.
                         (component-root-dir component :source)))
           )
     ;; If *SOURCE-PATHNAME-DEFAULT* or *BINARY-PATHNAME-DEFAULT* is "",
     ;; then COMPONENT-SOURCE-PATHNAME or COMPONENT-BINARY-PATHNAME could
     ;; wind up being "", which is wrong for :file components. So replace
     ;; them with NIL.
     (when (null-string (component-pathname component pathname-type))
       (setf (component-pathname component pathname-type) nil))
     ;; The relative pathname is the name part
     (setf (component-pathname component pathname-type)
           (or (when (and (eq pathname-type :binary)
                          (null (component-pathname component :binary)))
                 ;; When the binary-pathname is nil use source.
                 (component-pathname component :source))
               (or (when (component-pathname component pathname-type)
;                    (pathname-name )
                     (component-pathname component pathname-type))
                   (component-name component)))))
    ((:module :subsystem)                       ; Pathname relative to parent.
     ;; Inherit root-dir from parent
     (setf (component-root-dir component pathname-type)
           (component-root-dir parent pathname-type))
     ;; Tack the relative-dir onto the pathname
     (setf (component-pathname component pathname-type)
           (or (when (and (eq pathname-type :binary)
                          (null (component-pathname component :binary)))
                 ;; When the binary-pathname is nil use source.
                 (component-pathname component :source))
               (append-directories
                (component-pathname parent pathname-type)
                (or (component-pathname component pathname-type)
                    (component-name component))))))
    (:file                              ; Pathname relative to parent.
     ;; Inherit root-dir from parent
     (setf (component-root-dir component pathname-type)
           (component-root-dir parent pathname-type))
     ;; If *SOURCE-PATHNAME-DEFAULT* or *BINARY-PATHNAME-DEFAULT* is "",
     ;; then COMPONENT-SOURCE-PATHNAME or COMPONENT-BINARY-PATHNAME could
     ;; wind up being "", which is wrong for :file components. So replace
     ;; them with NIL.
     (when (null-string (component-pathname component pathname-type))
       (setf (component-pathname component pathname-type) nil))
     ;; Tack the relative-dir onto the pathname
     (setf (component-pathname component pathname-type)
           (or (append-directories
                (component-pathname parent pathname-type)
                (or (component-pathname component pathname-type)
                    (component-name component)
                    (when (eq pathname-type :binary)
                      ;; When the binary-pathname is nil use source.
                      (component-pathname component :source)))))))
    ))

#|| ;; old version
(defun expand-component-components (component &optional (indent 0))
  (let ((definitions (component-components component)))
    (setf (component-components component)
          (remove-if #'null
                     (mapcar #'(lambda (definition)
                                 (expand-component-definition definition
                                                              component
                                                              indent))
                             definitions)))))
||#
;; new version
(defun expand-component-components (component &optional (indent 0))
  (let ((definitions (component-components component)))
    (if (eq (car definitions) :serial)
        (setf (component-components component)
              (expand-serial-component-chain (cdr definitions)
                                             component indent))
        (setf (component-components component)
              (expand-component-definitions definitions component indent)))))

(defun expand-component-definitions (definitions parent &optional (indent 0))
  (let ((components nil))
    (dolist (definition definitions)
      (let ((new (expand-component-definition definition parent indent)))
        (when new (push new components))))
    (nreverse components)))

(defun expand-serial-component-chain (definitions parent &optional (indent 0))
  (let ((previous nil)
        (components nil))
    (dolist (definition definitions)
      (let ((new (expand-component-definition definition parent indent)))
        (when new
          ;; Make this component depend on the previous one. Since
          ;; we don't know the form of the definition, we have to
          ;; expand it first.
          (when previous (pushnew previous (component-depends-on new)))
          ;; The dependencies will be linked later, so we use the name
          ;; instead of the actual component.
          (setq previous (component-name new))
          ;; Save the new component.
          (push new components))))
    ;; Return the list of expanded components, in appropriate order.
    (nreverse components)))


(defparameter *enable-straz-absolute-string-hack* nil
  "Special hack requested by Steve Strassman, where the shorthand
   that specifies a list of components as a list of strings also
   recognizes absolute pathnames and treats them as files of type
   :private-file instead of type :file. Defaults to NIL, because I
   haven't tested this.")
(defun absolute-file-namestring-p (string)
  ;; If a FILE namestring starts with a slash, or is a logical pathname
  ;; as implied by the existence of a colon in the filename, assume it
  ;; represents an absolute pathname.
  (or (find #\: string :test #'char=)
      (and (not (null-string string))
           (char= (char string 0) #\/))))

(defun expand-component-definition (definition parent &optional (indent 0))
  ;; Should do some checking for malformed definitions here.
  (cond ((null definition) nil)
        ((stringp definition)
         ;; Strings are assumed to be of type :file
         (if (and *enable-straz-absolute-string-hack*
                  (absolute-file-namestring-p definition))
             ;; Special hack for Straz
             (create-component :private-file definition nil parent indent)
           ;; Normal behavior
           (create-component :file definition nil parent indent)))
        ((and (listp definition)
              (not (member (car definition)
                           '(:defsystem :system :subsystem
                             :module :file :private-file))))
         ;; Lists whose first element is not a component type
         ;; are assumed to be of type :file
         (create-component :file
                           (car definition)
                           (cdr definition)
                           parent
                           indent))
        ((listp definition)
         ;; Otherwise, it is (we hope) a normal form definition
         (create-component (car definition)   ; type
                           (cadr definition)  ; name
                           (cddr definition)  ; definition body
                           parent             ; parent
                           indent)            ; indent
         )))

(defun link-component-depends-on (components)
  (dolist (component components)
    (unless (and *system-dependencies-delayed*
                 (eq (component-type component) :defsystem))
      (setf (component-depends-on component)
            (mapcar #'(lambda (dependency)
                        (let ((parent (find (string dependency) components
                                            :key #'component-name
                                            :test #'string-equal)))
                          (cond (parent parent)
                                ;; make it more intelligent about the following
                                (t (warn "Dependency ~S of component ~S not found."
                                         dependency component)))))

                    (component-depends-on component))))))

;;; ********************************
;;; Topological Sort the Graph *****
;;; ********************************

;;; New version of topological sort suggested by rs2. Even though
;;; this version avoids the call to sort, in practice it isn't faster. It
;;; does, however, eliminate the need to have a TIME slot in the
;;; topological-sort-node defstruct.
(defun topological-sort (list &aux (sorted-list nil))
  (labels ((dfs-visit (znode)
              (setf (topsort-color znode) :gray)
              (unless (and *system-dependencies-delayed*
                           (eq (component-type znode) :system))
                (dolist (child (component-depends-on znode))
                  (cond ((eq (topsort-color child) :white)
                         (dfs-visit child))
                        ((eq (topsort-color child) :gray)
                         (format t "~&Detected cycle containing ~A" child)))))
              (setf (topsort-color znode) :black)
              (push znode sorted-list)))
    (dolist (znode list)
      (setf (topsort-color znode) :white))
    (dolist (znode list)
      (when (eq (topsort-color znode) :white)
        (dfs-visit znode)))
    (nreverse sorted-list)))

#||
;;; Older version of topological sort.
(defun topological-sort (list &aux (time 0))
  ;; The algorithm works by calling depth-first-search to compute the
  ;; blackening times for each vertex, and then sorts the vertices into
  ;; reverse order by blackening time.
  (labels ((dfs-visit (node)
              (setf (topsort-color node) 'gray)
              (unless (and *system-dependencies-delayed*
                           (eq (component-type node) :defsystem))
                (dolist (child (component-depends-on node))
                  (cond ((eq (topsort-color child) 'white)
                         (dfs-visit child))
                        ((eq (topsort-color child) 'gray)
                         (format t "~&Detected cycle containing ~A" child)))))
                      (setf (topsort-color node) 'black)
                      (setf (topsort-time node) time)
                      (incf time)))
    (dolist (node list)
      (setf (topsort-color node) 'white))
    (dolist (node list)
      (when (eq (topsort-color node) 'white)
        (dfs-visit node)))
    (sort list #'< :key #'topsort-time)))
||#

;;; ********************************
;;; Output to User *****************
;;; ********************************
;;; All output to the user is via the tell-user functions.

(defun split-string (string &key (item #\space) (test #'char=))
  ;; Splits the string into substrings at spaces.
  (let ((len (length string))
        (index 0) result)
    (dotimes (i len
                (progn (unless (= index len)
                         (push (subseq string index) result))
                       (reverse result)))
      (when (funcall test (char string i) item)
        (unless (= index i);; two spaces in a row
          (push (subseq string index i) result))
        (setf index (1+ i))))))

;; probably should remove the ",1" entirely. But AKCL 1.243 dies on it
;; because of an AKCL bug.
;; KGK suggests using an 8 instead, but 1 does nicely.
(defun prompt-string (component)
  (format nil "; ~:[~;TEST:~]~V,1@T "
          *oos-test*
          (component-indent component)))

#||
(defun format-justified-string (prompt contents)
  (format t (concatenate 'string
                         "~%"
                         prompt
                         "-~{~<~%" prompt " ~1,80:; ~A~>~^~}")
          (split-string contents))
  (finish-output *standard-output*))
||#

(defun format-justified-string (prompt contents &optional (width 80)
                                       (stream *standard-output*))
  (let ((prompt-length (+ 2 (length prompt))))
    (cond ((< (+ prompt-length (length contents)) width)
           (format stream "~%~A- ~A" prompt contents))
          (t
           (format stream "~%~A-" prompt)
           (do* ((cursor prompt-length)
                 (contents (split-string contents) (cdr contents))
                 (content (car contents) (car contents))
                 (content-length (1+ (length content)) (1+ (length content))))
               ((null contents))
             (cond ((< (+ cursor content-length) width)
                    (incf cursor content-length)
                    (format stream " ~A" content))
                   (t
                    (setf cursor (+ prompt-length content-length))
                    (format stream "~%~A  ~A" prompt content)))))))
  (finish-output stream))

(defun tell-user (what component &optional type no-dots force)
  (when (or *oos-verbose* force)
    (format-justified-string (prompt-string component)
     (format nil "~A ~(~A~) ~@[\"~A\"~] ~:[~;...~]"
             ;; To have better messages, wrap the following around the
             ;; case statement:
             ;;(if (find (component-type component)
             ;;    '(:defsystem :system :subsystem :module))
             ;;  "Checking"
             ;;  (case ...))
             ;; This gets around the problem of DEFSYSTEM reporting
             ;; that it's loading a module, when it eventually never
             ;; loads any of the files of the module.
             (case what
               ((compile :compile)
                (if (component-load-only component)
                    ;; If it is :load-only t, we're loading.
                    "Loading"
                    ;; Otherwise we're compiling.
                    "Compiling"))
               ((load :load) "Loading")
               (otherwise what))
             (component-type component)
             (or (when type
                   (component-full-pathname component type))
                 (component-name component))
             (and *tell-user-when-done*
                  (not no-dots))))))

(defun tell-user-done (component &optional force no-dots)
  ;; test is no longer really used, but we're leaving it in.
  (when (and *tell-user-when-done*
             (or *oos-verbose* force))
    (format t "~&~A~:[~;...~] Done."
            (prompt-string component) (not no-dots))
    (finish-output *standard-output*)))

(defmacro with-tell-user ((what component &optional type no-dots force) &body body)
  `(progn
     (tell-user ,what ,component ,type ,no-dots ,force)
     ,@body
     (tell-user-done ,component ,force ,no-dots)))

(defun tell-user-no-files (component &optional force)
  (when (or *oos-verbose* force)
    (format-justified-string (prompt-string component)
      (format nil "Source file ~A ~
             ~:[and binary file ~A ~;~]not found, not loading."
              (component-full-pathname component :source)
              (or *load-source-if-no-binary* *load-source-instead-of-binary*)
              (component-full-pathname component :binary)))))

(defun tell-user-require-system (name parent)
  (when *oos-verbose*
    (format t "~&; ~:[~;TEST:~] - System ~A requires ~S"
            *oos-test* (component-name parent) name)
    (finish-output *standard-output*)))

(defun tell-user-generic (string)
  (when *oos-verbose*
    (format t "~&; ~:[~;TEST:~] - ~A"
            *oos-test* string)
    (finish-output *standard-output*)))

;;; ********************************
;;; Y-OR-N-P-WAIT ******************
;;; ********************************
;;; Y-OR-N-P-WAIT is like Y-OR-N-P, but will timeout after a specified
;;; number of seconds. I should really replace this with a call to
;;; the Y-OR-N-P-WAIT defined in the query.cl package and include that
;;; instead.

(defparameter *use-timeouts* t
  "If T, timeouts in Y-OR-N-P-WAIT are enabled. Otherwise it behaves
   like Y-OR-N-P. This is provided for users whose lisps don't handle
   read-char-no-hang properly.")

(defparameter *clear-input-before-query* t
  "If T, y-or-n-p-wait will clear the input before printing the prompt
   and asking the user for input.")

;;; The higher *sleep-amount* is, the less consing, but the lower the
;;; responsiveness.
(defparameter *sleep-amount* #-CMU 0.1 #+CMU 1.0
    "Amount of time to sleep between checking query-io. In multiprocessing
     Lisps, this allows other processes to continue while we busy-wait. If
     0, skips call to SLEEP.")

(defun internal-real-time-in-seconds ()
  (get-universal-time))

(defun read-char-wait (&optional (timeout 20) input-stream
                                 (eof-error-p t) eof-value
                                 &aux peek)
  (do ((start (internal-real-time-in-seconds)))
      ((or (setq peek (listen input-stream))
           (< (+ start timeout) (internal-real-time-in-seconds)))
       (when peek
         ;; was read-char-no-hang
         (read-char input-stream eof-error-p eof-value)))
    (unless (zerop *sleep-amount*)
      (sleep *sleep-amount*))))

;;; Lots of lisps, especially those that run on top of UNIX, do not get
;;; their input one character at a time, but a whole line at a time because
;;; of the buffering done by the UNIX system. This causes y-or-n-p-wait
;;; to not always work as expected.
;;;
;;; I wish lisp did all its own buffering (turning off UNIX input line
;;; buffering by putting the UNIX into CBREAK mode). Of course, this means
;;; that we lose input editing, but why can't the lisp implement this?

(defun y-or-n-p-wait (&optional (default #\y) (timeout 20)
                                format-string &rest args)
  "Y-OR-N-P-WAIT prints the message, if any, and reads characters from
   *QUERY-IO* until the user enters y, Y or space as an affirmative, or either
   n or N as a negative answer, or the timeout occurs. It asks again if
   you enter any other characters."
  (when *clear-input-before-query* (clear-input *query-io*))
  (when format-string
    (fresh-line *query-io*)
    (apply #'format *query-io* format-string args)
    ;; FINISH-OUTPUT needed for CMU and other places which don't handle
    ;; output streams nicely. This prevents it from continuing and
    ;; reading the query until the prompt has been printed.
    (finish-output *query-io*))
  (loop
   (let* ((read-char (if *use-timeouts*
                         (read-char-wait timeout *query-io* nil nil)
                         (read-char *query-io*)))
          (char (or read-char default)))
     ;; We need to ignore #\newline because otherwise the bugs in
     ;; clear-input will cause y-or-n-p-wait to print the "Type ..."
     ;; message every time... *sigh*
     ;; Anyway, we might want to use this to ignore whitespace once
     ;; clear-input is fixed.
     (unless (find char '(#\tab #\newline #\return))
       (when (null read-char)
         (format *query-io* "~@[~A~]" default)
         (finish-output *query-io*))
       (cond ((null char) (return t))
             ((find char '(#\y #\Y #\space) :test #'char=) (return t))
             ((find char '(#\n #\N) :test #'char=) (return nil))
             (t
              (when *clear-input-before-query* (clear-input *query-io*))
              (format *query-io* "~&Type \"y\" for yes or \"n\" for no. ")
              (when format-string
                (fresh-line *query-io*)
                (apply #'format *query-io* format-string args))
              (finish-output *query-io*)))))))

#||
(y-or-n-p-wait #\y 20 "What? ")
(progn (format t "~&hi") (finish-output)
       (y-or-n-p-wait #\y 10 "1? ")
       (y-or-n-p-wait #\n 10 "2? "))
||#
;;; ********************************
;;; Operate on System **************
;;; ********************************
;;; Operate-on-system
;;; Operation is :compile, 'compile, :load or 'load
;;; Force is :all or :new-source or :new-source-and-dependents or a list of
;;; specific modules.
;;;    :all (or T) forces a recompilation of every file in the system
;;;    :new-source-and-dependents compiles only those files whose
;;;          sources have changed or who depend on recompiled files.
;;;    :new-source compiles only those files whose sources have changed
;;;    A list of modules means that only those modules and their
;;;    dependents are recompiled.
;;; Test is T to print out what it would do without actually doing it.
;;;      Note: it automatically sets verbose to T if test is T.
;;; Verbose is T to print out what it is doing (compiling, loading of
;;;      modules and files) as it does it.
;;; Dribble should be the pathname of the dribble file if you want to
;;; dribble the compilation.
;;; Load-source-instead-of-binary is T to load .lisp instead of binary files.
;;; Version may be nil to signify no subdirectory,
;;; a symbol, such as alpha, beta, omega, :alpha, mark, which
;;; specifies a subdirectory of the root, or
;;; a string, which replaces the root.

(defun operate-on-system (name operation
                               &key
                               force
                               (version *version*)
                               (test *oos-test*) (verbose *oos-verbose*)
                               (load-source-instead-of-binary
                                *load-source-instead-of-binary*)
                               (load-source-if-no-binary
                                *load-source-if-no-binary*)
                               (bother-user-if-no-binary
                                *bother-user-if-no-binary*)
                               (compile-during-load *compile-during-load*)
                               dribble
                               (minimal-load *minimal-load*)
                               (override-compilation-unit t)
                               )
  (declare #-(or :cltl2 :ansi-cl) (ignore override-compilation-unit))
  (unwind-protect
      ;; Protect the undribble.
      (#+(and (or :cltl2 :ansi-cl) (not :gcl)) with-compilation-unit
         #+(and (or :cltl2 :ansi-cl) (not :gcl)) (:override override-compilation-unit)
         #-(and (or :cltl2 :ansi-cl) (not :gcl)) progn
        (when *reset-full-pathname-table* (clear-full-pathname-tables))
        (when dribble (dribble dribble))
        (when test (setq verbose t))
        (when (null force)              ; defaults
          (case operation
            ((load :load) (setq force :all))
            ((compile :compile) (setq force :new-source-and-dependents))
            (t (setq force :all))))
        ;; Some CL implementations have a variable called *compile-verbose*
        ;; or *compile-file-verbose*.
        (multiple-value-bind (*version-dir* *version-replace*)
            (translate-version version)
          ;; CL implementations may uniformly default this to nil
          (let (
                #-(or MCL CMU CLISP ECL :sbcl lispworks scl)
                (*compile-file-verbose* t) ; nil
                #+common-lisp-controller
                (*compile-print* nil)
                #+(and common-lisp-controller cmu)
                (ext:*compile-progress* nil)
                #+(and common-lisp-controller cmu)
                (ext:*require-verbose* nil)
                #+(and common-lisp-controller cmu)
                (ext:*gc-verbose* nil)

                (*version* version)
                (*oos-verbose* verbose)
                (*oos-test* test)
                (*load-source-if-no-binary* load-source-if-no-binary)
                (*compile-during-load* compile-during-load)
                (*bother-user-if-no-binary* bother-user-if-no-binary)
                (*load-source-instead-of-binary* load-source-instead-of-binary)
                (*minimal-load* minimal-load)
                (system (if (and (component-p name)
                                 (member (component-type name)
                                         '(:system :defsystem :subsystem)))
                            name
                            (find-system name :load))))
            #-(or CMU CLISP :sbcl :lispworks :cormanlisp scl)
            (declare (special *compile-verbose* #-MCL *compile-file-verbose*)
                     #-openmcl (ignore *compile-verbose*
                                       #-MCL *compile-file-verbose*)
                     #-openmcl (optimize (inhibit-warnings 3)))
            (unless (component-operation operation)
              (error "Operation ~A undefined." operation))
            (operate-on-component system operation force))))
    (when dribble (dribble))))


(defun compile-system (name &key force
                            (version *version*)
                            (test *oos-test*) (verbose *oos-verbose*)
                            (load-source-instead-of-binary
                             *load-source-instead-of-binary*)
                            (load-source-if-no-binary
                             *load-source-if-no-binary*)
                            (bother-user-if-no-binary
                             *bother-user-if-no-binary*)
                            (compile-during-load *compile-during-load*)
                            dribble
                            (minimal-load *minimal-load*))
  ;; For users who are confused by OOS.
  (operate-on-system
   name :compile
   :force force
   :version version
   :test test
   :verbose verbose
   :load-source-instead-of-binary load-source-instead-of-binary
   :load-source-if-no-binary load-source-if-no-binary
   :bother-user-if-no-binary bother-user-if-no-binary
   :compile-during-load compile-during-load
   :dribble dribble
   :minimal-load minimal-load))

(defun load-system (name &key force
                         (version *version*)
                         (test *oos-test*) (verbose *oos-verbose*)
                         (load-source-instead-of-binary
                          *load-source-instead-of-binary*)
                         (load-source-if-no-binary *load-source-if-no-binary*)
                         (bother-user-if-no-binary *bother-user-if-no-binary*)
                         (compile-during-load *compile-during-load*)
                         dribble
                         (minimal-load *minimal-load*))
  ;; For users who are confused by OOS.
  (operate-on-system
   name :load
   :force force
   :version version
   :test test
   :verbose verbose
   :load-source-instead-of-binary load-source-instead-of-binary
   :load-source-if-no-binary load-source-if-no-binary
   :bother-user-if-no-binary bother-user-if-no-binary
   :compile-during-load compile-during-load
   :dribble dribble
   :minimal-load minimal-load))

(defun clean-system (name &key (force :all)
                         (version *version*)
                         (test *oos-test*) (verbose *oos-verbose*)
                         dribble)
  "Deletes all the binaries in the system."
  ;; For users who are confused by OOS.
  (operate-on-system
   name :delete-binaries
   :force force
   :version version
   :test test
   :verbose verbose
   :dribble dribble))

(defun edit-system
    (name &key force
               (version *version*)
               (test *oos-test*)
               (verbose *oos-verbose*)
               dribble)

  (operate-on-system
   name :edit
   :force force
   :version version
   :test test
   :verbose verbose
   :dribble dribble))

(defun hardcopy-system
    (name &key force
               (version *version*)
               (test *oos-test*)
               (verbose *oos-verbose*)
               dribble)

  (operate-on-system
   name :hardcopy
   :force force
   :version version
   :test test
   :verbose verbose
   :dribble dribble))


;;; ensure-external-system-def-loaded component --
;;; Let's treat definition clauses of the form
;;;
;;;     (:system "name")
;;; i.e.
;;;
;;;     (:system "name" :components nil)
;;;
;;; in a special way.
;;; When encountered, MK:DEFSYSTEM tries to FIND-SYSTEM
;;; the system named "name" (by forcing a reload from disk).
;;; This may be more "natural".

(defun ensure-external-system-def-loaded (component)
  (assert (member (component-type component)
                  '(:subsystem :system)))
  (when (null (component-components component))
    (let ((cname (component-name component)))
      ;; First we ensure that we reload the system definition.
      (undefsystem cname)
      (let* ((*reload-systems-from-disk* t)
             (system-component
              (find-system (component-name component)
                           :load

                           ;; Let's not supply the def-pname
                           ;; yet.
                           #+not-yet
                           (merge-pathname
                            (make-pathname :name cname
                                           :type "system"
                                           :directory ())
                            (component-full-pathname component
                                                     :source))


                           ))
             )
        ;; Now we have a problem.
        ;; We have just ensured that a system definition is
        ;; loaded, however, the COMPONENT at hand is different
        ;; from SYSTEM-COMPONENT.
        ;; To fix this problem we just use the following
        ;; kludge.  This should prevent re-entering in this
        ;; code branch, while actually preparing the COMPONENT
        ;; for operation.
        (setf (component-components component)
              (list system-component))
        ))))


(defun operate-on-component (component operation force &aux changed)
  ;; Returns T if something changed and had to be compiled.
  (let ((type (component-type component))
        (old-package (package-name *package*)))

    (unwind-protect
        ;; Protect old-package.
        (progn
          ;; Use the correct package.
          (when (component-package component)
            (tell-user-generic (format nil "Using package ~A"
                                       (component-package component)))
            (unless *oos-test*
              (unless (find-package (component-package component))
                ;; If the package name is the same as the name of the system,
                ;; and the package is not defined, this would lead to an
                ;; infinite loop, so bomb out with an error.
                (when (string-equal (string (component-package component))
                                    (component-name component))
                  (format t "~%Component ~A not loaded:~%"
                          (component-name component))
                  (error  "  Package ~A is not defined"
                          (component-package component)))
                ;; If package not found, try using REQUIRE to load it.
                (new-require (component-package component)))
              ;; This was USE-PACKAGE, but should be IN-PACKAGE.
              ;; Actually, CLtL2 lisps define in-package as a macro,
              ;; so we'll set the package manually.
              ;; (in-package (component-package component))
              (let ((package (find-package (component-package component))))
                (when package
                  (setf *package* package)))))

          ;; Marco Antoniotti 20040609
          ;; New feature.  Try to FIND-SYSTEM :system components if
          ;; they have no local :components definition.
          ;; OPERATE-ON-SYSTEM-DEPENDENCIES should still work as
          ;; advertised, given the small change made there.

          (when (or (eq type :system) (eq type :subsystem))
            (ensure-external-system-def-loaded component))

          (when (or (eq type :defsystem) (eq type :system))
            (operate-on-system-dependencies component operation force))

          ;; Do any compiler proclamations
          (when (component-proclamations component)
            (tell-user-generic (format nil "Doing proclamations for ~A"
                                       (component-name component)))
            (or *oos-test*
                (proclaim (component-proclamations component))))

          ;; Do any initial actions
          (when (component-initially-do component)
            (tell-user-generic (format nil "Doing initializations for ~A"
                                       (component-name component)))
            (or *oos-test*
                (eval (component-initially-do component))))

          ;; If operation is :compile and load-only is T, this would change
          ;; the operation to load. Only, this would mean that a module would
          ;; be considered to have changed if it was :load-only and had to be
          ;; loaded, and then dependents would be recompiled -- this doesn't
          ;; seem right. So instead, we propagate the :load-only attribute
          ;; to the components, and modify compile-file-operation so that
          ;; it won't compile the files (and modify tell-user to say "Loading"
          ;; instead of "Compiling" for load-only modules).
          #||
          (when (and (find operation '(:compile compile))
                     (component-load-only component))
            (setf operation :load))
          ||#

          ;; Do operation and set changed flag if necessary.
          (setq changed
                (case type
                  ((:file :private-file)
                   (funcall (component-operation operation) component force))
                  ((:module :system :subsystem :defsystem)
                   (operate-on-components component operation force changed))))

          ;; Do any final actions
          (when (component-finally-do component)
            (tell-user-generic (format nil "Doing finalizations for ~A"
                                       (component-name component)))
            (or *oos-test*
                (eval (component-finally-do component))))

          ;; add the banner if needed
          #+(or cmu scl)
          (when (component-banner component)
            (unless (stringp (component-banner component))
              (error "The banner should be a string, it is: ~S"
                     (component-banner component)))
            (setf (getf ext:*herald-items*
                        (intern (string-upcase  (component-name component))
                                (find-package :keyword)))
                  (list
                     (component-banner component)))))

      ;; Reset the package. (Cleanup form of unwind-protect.)
      ;;(in-package old-package)
      (setf *package* (find-package old-package)))

    ;; Provide the loaded system
    (when (or (eq type :defsystem) (eq type :system) (eq type :subsystem))
      (tell-user-generic (format nil "Providing system ~A~%"
                                 (component-name component)))
      (or *oos-test*
          (provide (canonicalize-system-name (component-name component))))))

  ;; Return non-NIL if something changed in this component and hence had
  ;; to be recompiled. This is only used as a boolean.
  changed)

(defvar *force* nil)
(defvar *providing-blocks-load-propagation* t
  "If T, if a system dependency exists on *modules*, it is not loaded.")

(defun operate-on-system-dependencies (component operation &optional force)
  (when *system-dependencies-delayed*
    (let ((*force* force))
      (dolist (system (component-depends-on component))
        ;; For each system that this system depends on, if it is a
        ;; defined system (either via defsystem or component type :system),
        ;; and propagation is turned on, propagates the operation to the
        ;; subsystem. Otherwise runs require (my version) on that system
        ;; to load it (needed since we may be depending on a lisp
        ;; dependent package).
        ;; Explores the system tree in a DFS manner.

        ;; Do not try to do anything with non system components.
        (cond ((and *operations-propagate-to-subsystems*
                    (not (listp system))
                    (or (stringp system) (symbolp system))
                    ;; The subsystem is a defined system.
                    (find-system system :load-or-nil))
               ;; Call OOS on it. Since *system-dependencies-delayed* is
               ;; T, the :depends-on slot is filled with the names of
               ;; systems, not defstructs.
               ;; Aside from system, operation, force, for everything else
               ;; we rely on the globals.
               (unless (and *providing-blocks-load-propagation*
                            ;; If *providing-blocks-load-propagation* is T,
                            ;; the system dependency must not exist in the
                            ;; *modules* for it to be loaded. Note that
                            ;; the dependencies are implicitly systems.
                            (find operation '(load :load))
                            ;; (or (eq force :all) (eq force t))
                            (find (canonicalize-system-name system)
                                  *modules* :test #'string-equal))

                 (operate-on-system system operation :force force)))

              ((listp system)
               ;; If the SYSTEM is a list then its contents are as follows.
               ;;
               ;;    (<name> <definition-pathname> <action> &optional <version>)
               ;;

               (destructuring-bind (system-name definition-pathname action
                                                &optional version)
                   system
                 (tell-user-require-system
                  (if (and (null system-name)
                           (null definition-pathname))
                      action
                      system)
                  component)
                 (or *oos-test* (new-require system-name
                                             nil
                                             (eval definition-pathname)
                                             action
                                             (or version *version*)))))
              ((and (component-p system)
                    (not (member (component-type system)
                                 '(:defsystem :subsystem :system))))
               ;; Do nothing for non system components.
               )
              (t
               (tell-user-require-system system component)
               (or *oos-test* (new-require system))))
        ))))

;;; Modules can depend only on siblings. If a module should depend
;;; on an uncle, then the parent module should depend on that uncle
;;; instead. Likewise a module should depend on a sibling, not a niece
;;; or nephew. Modules also cannot depend on cousins. Modules cannot
;;; depend on parents, since that is circular.

(defun module-depends-on-changed (module changed)
  (dolist (dependent (component-depends-on module))
    (when (member dependent changed)
      (return t))))

(defun operate-on-components (component operation force changed)
  (with-tell-user (operation component)
    (if (component-components component)
        (dolist (module (component-components component))
          (when (operate-on-component module operation
                  (cond ((and (module-depends-on-changed module changed)
                              #||(some #'(lambda (dependent)
                                        (member dependent changed))
                                    (component-depends-on module))||#
                              (or (non-empty-listp force)
                                  (eq force :new-source-and-dependents)))
                         ;; The component depends on a changed file
                         ;; and force agrees.
                         (if (eq force :new-source-and-dependents)
                             :new-source-all
                           :all))
                        ((and (non-empty-listp force)
                              (member (component-name module) force
                                      :test #'string-equal :key #'string))
                         ;; Force is a list of modules
                         ;; and the component is one of them.
                         :all)
                        (t force)))
            (push module changed)))
        (case operation
          ((compile :compile)
           (eval (component-compile-form component)))
          ((load :load)
           (eval (component-load-form component))))))
  ;; This is only used as a boolean.
  changed)

;;; ********************************
;;; New Require ********************
;;; ********************************

;;; This needs cleaning.  Obviously the code is a left over from the
;;; time people did not know how to use packages in a proper way or
;;; CLs were shaky in their implementation.

;;; First of all we need this. (Commented out for the time being)
;;; (shadow '(cl:require))


(defvar *old-require* nil)

;;; All calls to require in this file have been replaced with calls
;;; to new-require to avoid compiler warnings and make this less of
;;; a tangled mess.

(defun new-require (module-name
                    &optional
                    pathname
                    definition-pname
                    default-action
                    (version *version*))
  ;; If the pathname is present, this behaves like the old require.
  (unless (and module-name
               (find (string module-name)
                     *modules* :test #'string=))
    (handler-case
        (cond (pathname
               (funcall *old-require* module-name pathname))
              ;; If the system is defined, load it.
              ((find-system module-name :load-or-nil definition-pname)
               (operate-on-system
                module-name :load
                :force *force*
                :version version
                :test *oos-test*
                :verbose *oos-verbose*
                :load-source-if-no-binary *load-source-if-no-binary*
                :bother-user-if-no-binary *bother-user-if-no-binary*
                :compile-during-load *compile-during-load*
                :load-source-instead-of-binary *load-source-instead-of-binary*
                :minimal-load *minimal-load*))
              ;; If there's a default action, do it. This could be a progn which
              ;; loads a file that does everything.
              ((and default-action
                    (eval default-action)))
              ;; If no system definition file, try regular require.
              ;; had last arg  PATHNAME, but this wasn't really necessary.
              ((funcall *old-require* module-name))
              ;; If no default action, print a warning or error message.
              (t
               #||
               (format t "~&Warning: System ~A doesn't seem to be defined..."
                       module-name)
               ||#
               (error 'missing-system :name module-name)))
      (missing-module (mmc) (signal mmc)) ; Resignal.
      (error (e)
             (declare (ignore e))
             ;; Signal a (maybe wrong) MISSING-SYSTEM.
             (error 'missing-system :name module-name)))
    ))


;;; Note that in some lisps, when the compiler sees a REQUIRE form at
;;; top level it immediately executes it. This is as if an
;;; (eval-when (compile load eval) ...) were wrapped around the REQUIRE
;;; form. I don't see any easy way to do this without making REQUIRE
;;; a macro.
;;;
;;; For example, in VAXLisp, if a (require 'streams) form is at the top of
;;; a file in the system, compiling the system doesn't wind up loading the
;;; streams module. If the (require 'streams) form is included within an
;;; (eval-when (compile load eval) ...) then everything is OK.
;;;
;;; So perhaps we should replace the redefinition of lisp:require
;;; with the following macro definition:
#||
(unless *old-require*
  (setf *old-require*
        (symbol-function #-(or :lispworks
                               :sbcl
                               (and :excl :allegro-v4.0)) 'lisp:require
                         #+:sbcl 'cl:require
                         #+:lispworks 'system:::require
                         #+(and :excl :allegro-v4.0) 'cltl1:require))

  (let (#+:CCL (ccl:*warn-if-redefine-kernel* nil))
    ;; Note that lots of lisps barf if we redefine a function from
    ;; the LISP package. So what we do is define a macro with an
    ;; unused name, and use (setf macro-function) to redefine
    ;; lisp:require without compiler warnings. If the lisp doesn't
    ;; do the right thing, try just replacing require-as-macro
    ;; with lisp:require.
    (defmacro require-as-macro (module-name
                                &optional pathname definition-pname
                                default-action (version '*version*))
      `(eval-when (compile load eval)
         (new-require ,module-name ,pathname ,definition-pname
                      ,default-action ,version)))
    (setf (macro-function #-(and :excl :sbcl :allegro-v4.0) 'lisp:require
                          #+:sbcl 'cl:require
                          #+(and :excl :allegro-v4.0) 'cltl1:require)
          (macro-function 'require-as-macro))))
||#
;;; This will almost certainly fix the problem, but will cause problems
;;; if anybody does a funcall on #'require.

;;; Redefine old require to call the new require.
(eval-when #-(or :lucid) (:load-toplevel :execute)
           #+(or :lucid) (load eval)
(unless *old-require*
  (setf *old-require*
        (symbol-function
         #-(or (and :excl :allegro-v4.0) :ecl :mcl :sbcl :scl :lispworks :abcl  :openmcl) 'lisp:require
         #+(and :excl :allegro-v4.0) 'cltl1:require
         #+(or :ecl :sbcl :scl) 'cl:require
         #+(or :lispworks3.1 :abcl) 'common-lisp::require
         #+(and :lispworks (not :lispworks3.1)) 'system::require
         #+:openmcl 'cl:require
         #+(and :mcl (not :openmcl)) 'ccl:require
         ))

  (unless *dont-redefine-require*
    (let (#+(or :mcl (and :CCL (not :lispworks)))
          (ccl:*warn-if-redefine-kernel* nil))
      #-(or :ecl (and allegro-version>= (version>= 4 1)) :lispworks)
      (setf (symbol-function
             #-(or (and :excl :allegro-v4.0) :mcl :sbcl :scl :lispworks :abcl :openmcl) 'lisp:require
             #+(and :excl :allegro-v4.0) 'cltl1:require
             #+(or :lispworks3.1 :abcl) 'common-lisp::require
             #+(or :sbcl :scl) 'cl:require
             #+(and :lispworks (not :lispworks3.1)) 'system::require
             #+:openmcl 'cl:require
             #+(and :mcl (not :openmcl)) 'ccl:require
             )
            (symbol-function 'new-require))
      #+:ecl
      (progn
        (ext:package-lock "CL" nil)
        (setf (symbol-function 'cl:require)
              (symbol-function 'new-require))
        (ext:package-lock "CL" t))
      #+:lispworks
      (let ((warn-packs system::*packages-for-warn-on-redefinition*))
        (declare (special system::*packages-for-warn-on-redefinition*))
        (setq system::*packages-for-warn-on-redefinition* nil)
        (setf (symbol-function
               #+:lispworks3.1 'common-lisp::require
               #-:lispworks3.1 'system::require
               )
              (symbol-function 'new-require))
        (setq system::*packages-for-warn-on-redefinition* warn-packs))
      #+(and allegro-version>= (version>= 4 1))
      (excl:without-package-locks
       (setf (symbol-function 'lisp:require)
         (symbol-function 'new-require))))))
)


;;; Well, let's add some more REQUIRE hacking; specifically for SBCL,
;;; and, eventually, for CMUCL.

#+sbcl
(eval-when (:compile-toplevel :load-toplevel :execute)

(defun sbcl-mk-defsystem-module-provider (name)
  ;; Let's hope things go smoothly.
    (let ((module-name (string-downcase (string name))))
      (when (mk:find-system module-name :load-or-nil)
        (mk:load-system module-name
                        :compile-during-load t
                        :verbose nil))))

(pushnew 'sbcl-mk-defsystem-module-provider sb-ext:*module-provider-functions*)
)

#+#.(cl:if (cl:and (cl:find-package :ext) (cl:find-symbol "*MODULE-PROVIDER-FUNCTIONS*" :ext)) '(and) '(or))
(progn
  (defun cmucl-mk-defsystem-module-provider (name)
    (let ((module-name (string-downcase (string name))))
      (when (mk:find-system module-name :load-or-nil)
        (mk:load-system module-name
                        :compile-during-load t
                        :verbose nil))))

  (pushnew 'cmucl-mk-defsystem-module-provider ext:*module-provider-functions*)
  )




;;; ********************************
;;; Language-Dependent Characteristics
;;; ********************************
;;; This section is used for defining language-specific behavior of
;;; defsystem. If the user changes a language definition, it should
;;; take effect immediately -- they shouldn't have to reload the
;;; system definition file for the changes to take effect.

(defvar *language-table* (make-hash-table :test #'equal)
  "Hash table that maps from languages to language structures.")
(defun find-language (name)
  (gethash name *language-table*))

(defstruct (language (:print-function print-language))
  name                  ; The name of the language (a keyword)
  compiler              ; The function used to compile files in the language
  loader                ; The function used to load files in the language
  source-extension      ; Filename extensions for source files
  binary-extension      ; Filename extensions for binary files
)

(defun print-language (language stream depth)
  (declare (ignore depth))
  (format stream "#<~:@(~A~): ~A ~A>"
          (language-name language)
          (language-source-extension language)
          (language-binary-extension language)))

(defun compile-function (component)
  (or (component-compiler component)
      (let ((language (find-language (or (component-language component)
                                         :lisp))))
        (when language (language-compiler language)))
      #'compile-file))

(defun load-function (component)
  (or (component-loader component)
      (let ((language (find-language (or (component-language component)
                                         :lisp))))
        (when language (language-loader language)))
      #'load))

(defun default-source-extension (component)
  (let ((language (find-language (or (component-language component)
                                     :lisp))))
    (or (when language (language-source-extension language))
        (car *filename-extensions*))))

(defun default-binary-extension (component)
  (let ((language (find-language (or (component-language component)
                                     :lisp))))
    (or (when language (language-binary-extension language))
        (cdr *filename-extensions*))))

(defmacro define-language (name &key compiler loader
                                source-extension binary-extension)
  (let ((language (gensym (symbol-name '#:language))))
    `(let ((,language (make-language :name ,name
                                     :compiler ,compiler
                                     :loader ,loader
                                     :source-extension ,source-extension
                                     :binary-extension ,binary-extension)))
       (setf (gethash ,name *language-table*) ,language)
       ,name)))

#||
;;; Test System for verifying multi-language capabilities.
(defsystem foo
  :language :lisp
  :components ((:module c :language :c :components ("foo" "bar"))
               (:module lisp :components ("baz" "barf"))))

||#

;;; *** Lisp Language Definition
(define-language :lisp
  :compiler #'compile-file
  :loader #'load
  :source-extension (car *filename-extensions*)
  :binary-extension (cdr *filename-extensions*))

;;; *** PseudoScheme Language Definition
(defun scheme-compile-file (filename &rest args)
  (let ((scheme-package (find-package '#:scheme)))
    (apply (symbol-function (find-symbol (symbol-name 'compile-file)
                                         scheme-package))
           filename
           (funcall (symbol-function
                     (find-symbol (symbol-name '#:interaction-environment)
                                  scheme-package)))
           args)))

(define-language :scheme
  :compiler #'scheme-compile-file
  :loader #'load
  :source-extension "scm"
  :binary-extension "bin")

;;; *** C Language Definition

;;; This is very basic. Somebody else who needs it can add in support
;;; for header files, libraries, different C compilers, etc. For example,
;;; we might add a COMPILER-OPTIONS slot to the component defstruct.

(defparameter *c-compiler* "gcc")
#-(or symbolics (and :lispworks :harlequin-pc-lisp ))

(defun run-unix-program (program arguments)
  ;; arguments should be a list of strings, where each element is a
  ;; command-line option to send to the program.
  #+:lucid (run-program program :arguments arguments)
  #+:allegro (excl:run-shell-command
              (format nil "~A~@[ ~{~A~^ ~}~]"
                      program arguments))
  #+(or :kcl :ecl) (system (format nil "~A~@[ ~{~A~^ ~}~]" program arguments))
  #+(or :cmu :scl) (extensions:run-program program arguments)
  #+:openmcl (ccl:run-program program arguments)
  #+:sbcl (sb-ext:run-program program arguments)
  #+:lispworks (sys:call-system-showing-output
                (format nil "~A~@[ ~{~A~^ ~}~]" program arguments))
  #+clisp (#+lisp=cl ext:run-program #-lisp=cl lisp:run-program
                     program :arguments arguments)
  )

#+(or symbolics (and :lispworks :harlequin-pc-lisp))
(defun run-unix-program (program arguments)
  (declare (ignore program arguments))
  (error "MK::RUN-UNIX-PROGRAM: this does not seem to be a UN*X system.")
  )

#||
(defun c-compile-file (filename &rest args &key output-file error-file)
  ;; gcc -c foo.c -o foo.o
  (declare (ignore args))
  (run-unix-program *c-compiler*
                    (format nil "-c ~A~@[ -o ~A~]"
                            filename
                            output-file)))
||#

#||
(defun c-compile-file (filename &rest args &key output-file error-file)
  ;; gcc -c foo.c -o foo.o
  (declare (ignore args error-file))
  (run-unix-program *c-compiler*
                    `("-c" ,filename ,@(if output-file `("-o" ,output-file)))))
||#


;;; The following code was inserted to improve C compiler support (at
;;; least under Linux/GCC).
;;; Thanks to Espen S Johnsen.
;;;
;;; 20001118 Marco Antoniotti.

(defun default-output-pathname (path1 path2 type)
  (if (eq path1 t)
      (translate-logical-pathname
       (merge-pathnames (make-pathname :type type) (pathname path2)))
      (translate-logical-pathname (pathname path1))))


(defun run-compiler (program
                     arguments
                     output-file
                     error-file
                     error-output
                     verbose)
  #-(or cmu scl) (declare (ignore error-file error-output))

  (flet ((make-useable-stream (&rest streams)
           (apply #'make-broadcast-stream (delete nil streams)))
         )
    (let (#+(or cmu scl) (error-file error-file)
          #+(or cmu scl) (error-file-stream nil)
          (verbose-stream nil)
          (old-timestamp (file-write-date output-file))
          (fatal-error nil)
          (output-file-written nil)
          )
      (unwind-protect
           (progn
             #+(or cmu scl)
             (setf error-file
                   (when error-file
                     (default-output-pathname error-file
                                              output-file
                                              *compile-error-file-type*))

                   error-file-stream
                   (and error-file
                        (open error-file
                              :direction :output
                              :if-exists :supersede)))

             (setf verbose-stream
                   (make-useable-stream
                    #+(or cmu scl) error-file-stream
                    (and verbose *trace-output*)))

             (format verbose-stream "Running ~A~@[ ~{~A~^ ~}~]~%"
                     program
                     arguments)

             (setf fatal-error
                   #-(or cmu scl)
                   (and (run-unix-program program arguments) nil) ; Incomplete.
                   #+(or cmu scl)
                   (let* ((error-output
                           (make-useable-stream error-file-stream
                                                (if (eq error-output t)
                                                    *error-output*
                                                    error-output)))
                          (process
                           (ext:run-program program arguments
                                            :error error-output)))
                     (not (zerop (ext:process-exit-code process)))))

             (setf output-file-written
                   (and (probe-file output-file)
                        (not (eql old-timestamp
                                  (file-write-date output-file)))))


             (when output-file-written
               (format verbose-stream "~A written~%" output-file))
             (format verbose-stream "Running of ~A finished~%"
                     program)
             (values (and output-file-written output-file)
                     fatal-error
                     fatal-error))

        #+(or cmu scl)
        (when error-file
          (close error-file-stream)
          (unless (or fatal-error (not output-file-written))
            (delete-file error-file)))

        (values (and output-file-written output-file)
                fatal-error
                fatal-error)))))


;;; C Language definitions.

(defun c-compile-file (filename &rest args
                                &key
                                (output-file t)
                                (error-file t)
                                (error-output t)
                                (verbose *compile-verbose*)
                                debug
                                link
                                optimize
                                cflags
                                definitions
                                include-paths
                                library-paths
                                libraries
                                (error t))
  (declare (ignore args))

  (flet ((map-options (flag options &optional (func #'identity))
           (mapcar #'(lambda (option)
                       (format nil "~A~A" flag (funcall func option)))
                   options))
         )
    (let* ((output-file (default-output-pathname output-file filename "o"))
           (arguments
            `(,@(when (not link) '("-c"))
              ,@(when debug '("-g"))
              ,@(when optimize (list (format nil "-O~D" optimize)))
              ,@cflags
              ,@(map-options
                 "-D" definitions
                 #'(lambda (definition)
                     (if (atom definition)
                         definition
                       (apply #'format nil "~A=~A" definition))))
              ,@(map-options "-I" include-paths #'truename)
              ,(namestring (truename filename))
              "-o"
              ,(namestring (translate-logical-pathname output-file))
              ,@(map-options "-L" library-paths #'truename)
              ,@(map-options "-l" libraries))))

      (multiple-value-bind (output-file warnings fatal-errors)
          (run-compiler *c-compiler*
                        arguments
                        output-file
                        error-file
                        error-output
                        verbose)
        (if (and error (or (not output-file) fatal-errors))
            (error "Compilation failed")
            (values output-file warnings fatal-errors))))))


(define-language :c
  :compiler #'c-compile-file
  :loader #+:lucid #'load-foreign-files
          #+:allegro #'load
          #+(or :cmu :scl) #'alien:load-foreign
          #+:sbcl #'sb-alien:load-foreign
          #+(and :lispworks :unix (not :linux) (not :macosx)) #'link-load:read-foreign-modules
          #+(and :lispworks :unix (or :linux :macosx)) #'fli:register-module
          #+(and :lispworks :win32) #'fli:register-module
          #+(or :ecl :gcl :kcl) #'load ; should be enough.
          #-(or :lucid
                :allegro
                :cmu
                :sbcl
                :scl
                :lispworks
                :ecl :gcl :kcl)
          (lambda (&rest args)
            (declare (ignore args))
            (cerror "Continue returning NIL."
                    "Loader not defined for C foreign libraries in ~A ~A."
                    (lisp-implementation-type)
                    (lisp-implementation-version)))
  :source-extension "c"
  :binary-extension "o")


;;; Fortran Language definitions.
;;; From Matlisp.

(export '(*fortran-compiler* *fortran-options*))

(defparameter *fortran-compiler* "g77")
(defparameter *fortran-options* '("-O"))

(defun fortran-compile-file (filename &rest args
                                      &key output-file error-file
                                      &allow-other-keys)
  (declare (ignore error-file args))
  (let ((arg-list
         (append *fortran-options*
                 `("-c" ,filename ,@(if output-file `("-o" ,output-file))))))
    (run-unix-program *fortran-compiler* arg-list)))


(mk:define-language :fortran
    :compiler #'fortran-compile-file
    :loader #'identity
    :source-extension "f"
    :binary-extension "o")


;;; AR support.
;; How to create a library (archive) of object files

(export '(*ar-program* build-lib))

(defparameter *ar-program* "ar")

(defun build-lib (libname directory)
  (let ((args (list "rv" (truename libname))))
    (format t ";;; Building archive ~A~%" libname)
    (run-unix-program *ar-program*
                      (append args
                              (mapcar #'truename (directory directory))))))


;;; ********************************
;;; Component Operations ***********
;;; ********************************
;;; Define :compile/compile and :load/load operations
(eval-when (load eval)
(component-operation :compile  'compile-and-load-operation)
(component-operation 'compile  'compile-and-load-operation)
(component-operation :load     'load-file-operation)
(component-operation 'load     'load-file-operation)
)

(defun compile-and-load-operation (component force)
  ;; FORCE was CHANGED. this caused defsystem during compilation to only
  ;; load files that it immediately compiled.
  (let ((changed (compile-file-operation component force)))
    ;; Return T if the file had to be recompiled and reloaded.
    (if (and changed (component-compile-only component))
        ;; For files which are :compile-only T, compiling the file
        ;; satisfies the need to load.
        changed
        ;; If the file wasn't compiled, or :compile-only is nil,
        ;; check to see if it needs to be loaded.
        (and (load-file-operation component force) ; FORCE was CHANGED ???
             changed))))

(defun unmunge-lucid (namestring)
  ;; Lucid's implementation of COMPILE-FILE is non-standard, in that
  ;; when the :output-file is a relative pathname, it tries to munge
  ;; it with the directory of the source file. For example,
  ;; (compile-file "src/globals.lisp" :output-file "bin/globals.sbin")
  ;; tries to stick the file in "./src/bin/globals.sbin" instead of
  ;; "./bin/globals.sbin" like any normal lisp. This hack seems to fix the
  ;; problem. I wouldn't have expected this problem to occur with any
  ;; use of defsystem, but some defsystem users are depending on
  ;; using relative pathnames (at least three folks reported the problem).
  (cond ((null-string namestring) namestring)
        ((char= (char namestring 0) #\/)
         ;; It's an absolute namestring
         namestring)
        (t
         ;; Ugly, but seems to fix the problem.
         (concatenate 'string "./" namestring))))

;; Define our own version of ensure-directories-exist for gcl, if gcl
;; doesn't have it. (gcl 2.6.10 has ensure-directories-exist).
#+#.(cl:if (cl:and (cl:member :gcl cl:*features*) (cl:not (cl:fboundp (cl:find-symbol "ENSURE-DIRECTORIES-EXIST" "COMMON-LISP")))) '(and) '(or))
(defun ensure-directories-exist (pathspec &key verbose)
 (declare (ignore verbose))
 ;; A very gross implementation of ensure-directories-exist.  Just
 ;; call /bin/mkdir with our desired path.
 (let* ((dir (make-pathname :host (pathname-host pathspec)
                                                        :device (pathname-device pathspec)
                            :directory (pathname-directory pathspec)))
        (cmd (if (member :win32 *features*)
                 (format nil "mkdir \"~a\""
                         (coerce (subst #\\ #\/ (coerce (namestring dir) 'list)) 'string))
                 (format nil "/bin/mkdir -p ~S" (namestring dir)))))
   (unless (directory dir)
     (lisp:system cmd))
   ;; The second return value is supposed to be T if directories were
   ;; created.  I don't know how to tell that, so we just return T.
   ;; (Would NIL be better?)
   (values pathspec t)))

(defun compile-file-operation (component force)
  ;; Returns T if the file had to be compiled.
  (let ((must-compile
         ;; For files which are :load-only T, loading the file
         ;; satisfies the demand to recompile.
         (and (null (component-load-only component)) ; not load-only
              (or (find force '(:all :new-source-all t) :test #'eq)
                  (and (find force '(:new-source :new-source-and-dependents)
                             :test #'eq)
                       (needs-compilation component nil)))))
        (source-pname (component-full-pathname component :source)))

    (cond ((and must-compile (probe-file source-pname))
           (with-tell-user ("Compiling source" component :source)
             (let ((output-file
                    #+:lucid
                     (unmunge-lucid (component-full-pathname component
                                                             :binary))
                     #-:lucid
                     (component-full-pathname component :binary)))

               ;; make certain the directory we need to write to
               ;; exists [pvaneynd@debian.org 20001114]
               ;; Added PATHNAME-HOST following suggestion by John
               ;; DeSoi [marcoxa@sourceforge.net 20020529]

               (ensure-directories-exist
                (make-pathname :name nil
                               :type nil
                               :version nil
                               :defaults output-file))

               (or *oos-test*
                   (apply (compile-function component)
                          source-pname
                          :output-file
                          output-file
                          #+(or :cmu :scl) :error-file
                          #+(or :cmu :scl) (and *cmu-errors-to-file*
                                                (component-full-pathname component
                                                                         :error))
                          #+CMU
                          :error-output
                          #+CMU
                          *cmu-errors-to-terminal*
                          (component-compiler-options component)
                          ))))
           must-compile)
          (must-compile
           (tell-user "Source file not found. Not compiling"
                      component :source :no-dots :force)
           nil)
          (t nil))))

;; see CLOCC/PORT/sys.lisp:compiled-file-p
(eval-when (load eval compile)
  (when (find-package :port)
    (import (find-symbol (symbol-name '#:compiled-file-p) :port))))
(unless (fboundp 'compiled-file-p)
 (defun compiled-file-p (file-name)
  "Return T if the FILE-NAME is a filename designator for a valid compiled.
Signal an error when it is not a filename designator.
Return NIL when the file does not exist, or is not readable,
or does not contain valid compiled code."
  (declare (ignorable file-name))
  #+clisp
  (with-open-file (in file-name :direction :input :if-does-not-exist nil)
    (and in (char= #\( (peek-char nil in))
         (let ((form (ignore-errors (read in nil nil))))
           (and (consp form)
                (eq (car form) 'SYSTEM::VERSION)
                (null (nth-value 1 (ignore-errors (eval form))))))))
  #-clisp t))

(defun needs-compilation (component force)
  ;; If there is no binary, or it is older than the source
  ;; file, then the component needs to be compiled.
  ;; Otherwise we only need to recompile if it depends on a file that changed.
  (declare (ignore force))
  (let ((source-pname (component-full-pathname component :source))
        (binary-pname (component-full-pathname component :binary)))
    (and
     ;; source must exist
     (probe-file source-pname)
     (or
      ;; We force recompilation.
      #|(find force '(:all :new-source-all) :test #'eq)|#
      ;; no binary
      (null (probe-file binary-pname))
      ;; old binary
      (< (file-write-date binary-pname)
         (file-write-date source-pname))
      ;; invalid binary
      #+clisp (not (compiled-file-p binary-pname))))))


(defun needs-loading (component &optional (check-source t) (check-binary t))
  ;; Compares the component's load-time against the file-write-date of
  ;; the files on disk.
  (let ((load-time (component-load-time component))
        (source-pname (component-full-pathname component :source))
        (binary-pname (component-full-pathname component :binary)))
    (or
     #|| ISI Extension ||#
     (component-load-always component)

     ;; File never loaded.
     (null load-time)
     ;; Binary is newer.
     (when (and check-binary
                (probe-file binary-pname))
       (< load-time
          (file-write-date binary-pname)))
     ;; Source is newer.
     (when (and check-source
                (probe-file source-pname))
       (< load-time
          (file-write-date source-pname))))))

;;; Need to completely rework this function...
(defun load-file-operation (component force)
  ;; Returns T if the file had to be loaded
  (let* ((binary-pname (component-full-pathname component :binary))
         (source-pname (component-full-pathname component :source))
         (binary-exists (probe-file binary-pname))
         (source-exists (probe-file source-pname))
         (source-needs-loading (needs-loading component t nil))
         (binary-needs-loading (needs-loading component nil t))
         ;; needs-compilation has an implicit source-exists in it.
         (needs-compilation (if (component-load-only component)
                                source-needs-loading
                                (needs-compilation component force)))
         (check-for-new-source
          ;; If force is :new-source*, we're checking for files
          ;; whose source is newer than the compiled versions.
          (find force '(:new-source :new-source-and-dependents :new-source-all)
                :test #'eq))
         (load-binary (or (find force '(:all :new-source-all t) :test #'eq)
                          binary-needs-loading))
         (load-source
          (or *load-source-instead-of-binary*
              (and load-binary (component-load-only component))
              (and check-for-new-source needs-compilation)))
         (compile-and-load
          (and needs-compilation
               (or load-binary check-for-new-source)
               (compile-and-load-source-if-no-binary component)))
         )
    ;; When we're trying to minimize the files loaded to only those
    ;; that need be, restrict the values of load-source and load-binary
    ;; so that we only load the component if the files are newer than
    ;; the load-time.
    (when (and *minimal-load*
               (not (find force '(:all :new-source-all)
                          :test #'eq)))
      (when load-source (setf load-source source-needs-loading))
      (when load-binary (setf load-binary binary-needs-loading)))

    (when (or load-source load-binary compile-and-load)
      (cond (compile-and-load
             ;; If we're loading the binary and it is old or nonexistent,
             ;; and the user says yes, compile and load the source.
             (compile-file-operation component t)
             (with-tell-user ("Loading binary"   component :binary)
               (or *oos-test*
                   (progn
                     (funcall (load-function component) binary-pname)
                     (setf (component-load-time component)
                           (file-write-date binary-pname)))))
             t)
            ((and source-exists
                  (or (and load-source  ; implicit needs-comp...
                           (or *load-source-instead-of-binary*
                               (component-load-only component)
                               (not *compile-during-load*)))
                      (and load-binary
                           (not binary-exists)
                           (load-source-if-no-binary component))))
             ;; Load the source if the source exists and:
             ;;   o  we're loading binary and it doesn't exist
             ;;   o  we're forcing it
             ;;   o  we're loading new source and user wasn't asked to compile
             (with-tell-user ("Loading source" component :source)
               (or *oos-test*
                   (progn
                     (funcall (load-function component) source-pname)
                     (setf (component-load-time component)
                           (file-write-date source-pname)))))
             t)
            ((and binary-exists load-binary)
             (with-tell-user ("Loading binary"   component :binary)
               (or *oos-test*
                   (progn
                     (funcall (load-function component) binary-pname)
                     (setf (component-load-time component)
                           (file-write-date binary-pname)))))
             t)
            ((and (not binary-exists) (not source-exists))
             (tell-user-no-files component :force)
             (when *files-missing-is-an-error*
               (cerror "Continue, ignoring missing files."
                       "~&Source file ~S ~:[and binary file ~S ~;~]do not exist."
                       source-pname
                       (or *load-source-if-no-binary*
                           *load-source-instead-of-binary*)
                       binary-pname))
             nil)
            (t
             nil)))))

(eval-when (load eval)
(component-operation :clean    'delete-binaries-operation)
(component-operation 'clean    'delete-binaries-operation)
(component-operation :delete-binaries     'delete-binaries-operation)
(component-operation 'delete-binaries     'delete-binaries-operation)
)
(defun delete-binaries-operation (component force)
  (when (or (eq force :all)
            (eq force t)
            (and (find force '(:new-source :new-source-and-dependents
                                           :new-source-all)
                       :test #'eq)
                 (needs-compilation component nil)))
    (let ((binary-pname (component-full-pathname component :binary)))
      (when (probe-file binary-pname)
        (with-tell-user ("Deleting binary"   component :binary)
                        (or *oos-test*
                            (delete-file binary-pname)))))))


;; when the operation = :compile, we can assume the binary exists in test mode.
;;      ((and *oos-test*
;;            (eq operation :compile)
;;            (probe-file (component-full-pathname component :source)))
;;       (with-tell-user ("Loading binary"   component :binary)))

(defun binary-exists (component)
  (probe-file (component-full-pathname component :binary)))

;;; or old-binary
(defun compile-and-load-source-if-no-binary (component)
  (when (not (or *load-source-instead-of-binary*
                 (and *load-source-if-no-binary*
                      (not (binary-exists component)))))
    (cond ((component-load-only component)
           #||
           (let ((prompt (prompt-string component)))
             (format t "~A- File ~A is load-only, ~
                        ~&~A  not compiling."
                     prompt
                     (component-full-pathname component :source)
                     prompt))
           ||#
           nil)
          ((eq *compile-during-load* :query)
           (let* ((prompt (prompt-string component))
                  (compile-source
                   (y-or-n-p-wait
                    #\y 30
                    "~A- Binary file ~A is old or does not exist. ~
                     ~&~A  Compile (and load) source file ~A instead? "
                    prompt
                    (component-full-pathname component :binary)
                    prompt
                    (component-full-pathname component :source))))
             (unless (y-or-n-p-wait
                      #\y 30
                      "~A- Should I bother you if this happens again? "
                      prompt)
               (setq *compile-during-load*
                     (y-or-n-p-wait
                      #\y 30
                      "~A- Should I compile while loading the system? "
                      prompt)))         ; was compile-source, then t
             compile-source))
          (*compile-during-load*)
          (t nil))))

(defun load-source-if-no-binary (component)
  (and (not *load-source-instead-of-binary*)
       (or (and *load-source-if-no-binary*
                (not (binary-exists component)))
           (component-load-only component)
           (when *bother-user-if-no-binary*
             (let* ((prompt (prompt-string component))
                    (load-source
                     (y-or-n-p-wait #\y 30
                      "~A- Binary file ~A does not exist. ~
                       ~&~A  Load source file ~A instead? "
                      prompt
                      (component-full-pathname component :binary)
                      prompt
                      (component-full-pathname component :source))))
               (setq *bother-user-if-no-binary*
                     (y-or-n-p-wait #\n 30
                      "~A- Should I bother you if this happens again? "
                      prompt ))
               (unless *bother-user-if-no-binary*
                 (setq *load-source-if-no-binary* load-source))
               load-source)))))

;;; ********************************
;;; Allegro Toplevel Commands ******
;;; ********************************
;;; Creates toplevel command aliases for Allegro CL.
#+:allegro
(top-level:alias ("compile-system" 8)
  (system &key force (minimal-load mk:*minimal-load*)
          test verbose version)
  "Compile the specified system"

  (mk:compile-system system :force force
                     :minimal-load minimal-load
                     :test test :verbose verbose
                     :version version))

#+:allegro
(top-level:alias ("load-system" 5)
  (system &key force (minimal-load mk:*minimal-load*)
          (compile-during-load mk:*compile-during-load*)
          test verbose version)
  "Compile the specified system"

  (mk:load-system system :force force
                  :minimal-load minimal-load
                  :compile-during-load compile-during-load
                  :test test :verbose verbose
                  :version version))

#+:allegro
(top-level:alias ("show-system" 5) (system)
  "Show information about the specified system."

  (mk:describe-system system))

#+:allegro
(top-level:alias ("describe-system" 9) (system)
  "Show information about the specified system."

  (mk:describe-system system))

#+:allegro
(top-level:alias ("system-source-size" 9) (system)
  "Show size information about source files in the specified system."

  (mk:system-source-size system))

#+:allegro
(top-level:alias ("clean-system" 6)
  (system &key force test verbose version)
  "Delete binaries in the specified system."

  (mk:clean-system system :force force
                   :test test :verbose verbose
                   :version version))

#+:allegro
(top-level:alias ("edit-system" 7)
  (system &key force test verbose version)
  "Load system source files into Emacs."

  (mk:edit-system system :force force
                  :test test :verbose verbose
                  :version version))

#+:allegro
(top-level:alias ("hardcopy-system" 9)
  (system &key force test verbose version)
  "Hardcopy files in the specified system."

  (mk:hardcopy-system system :force force
                      :test test :verbose verbose
                      :version version))

#+:allegro
(top-level:alias ("make-system-tag-table" 13) (system)
  "Make an Emacs TAGS file for source files in specified system."

  (mk:make-system-tag-table system))


;;; ********************************
;;; Allegro Make System Fasl *******
;;; ********************************
#+:excl
(defun allegro-make-system-fasl (system destination
                                        &optional (include-dependents t))
  (excl:shell
   (format nil "rm -f ~A; cat~{ ~A~} > ~A"
           destination
           (if include-dependents
               (files-in-system-and-dependents system :all :binary)
               (files-in-system system :all :binary))
           destination)))

(defun files-which-need-compilation (system)
  (mapcar #'(lambda (comp) (component-full-pathname comp :source))
          (remove nil
                  (file-components-in-component
                   (find-system system :load) :new-source))))

(defun files-in-system-and-dependents (name &optional (force :all)
                                            (type :source) version)
  ;; Returns a list of the pathnames in system and dependents in load order.
  (let ((system (find-system name :load)))
    (multiple-value-bind (*version-dir* *version-replace*)
        (translate-version version)
      (let ((*version* version))
        (let ((result (file-pathnames-in-component system type force)))
          (dolist (dependent (reverse (component-depends-on system)))
            (setq result
                  (append (files-in-system-and-dependents dependent
                                                          force type version)
                          result)))
          result)))))

(defun files-in-system (name &optional (force :all) (type :source) version)
  ;; Returns a list of the pathnames in system in load order.
  (let ((system (if (and (component-p name)
                         (member (component-type name) '(:defsystem :system :subsystem)))
                    name
                    (find-system name :load))))
    (multiple-value-bind (*version-dir* *version-replace*)
        (translate-version version)
      (let ((*version* version))
        (file-pathnames-in-component system type force)))))

(defun file-pathnames-in-component (component type &optional (force :all))
  (mapcar #'(lambda (comp) (component-full-pathname comp type))
          (file-components-in-component component force)))

(defun file-components-in-component (component &optional (force :all)
                                               &aux result changed)
  (case (component-type component)
    ((:file :private-file)
     (when (setq changed
                 (or (find force '(:all t) :test #'eq)
                     (and (not (non-empty-listp force))
                          (needs-compilation component nil))))
       (setq result
             (list component))))
    ((:module :system :subsystem :defsystem)
     (dolist (module (component-components component))
       (multiple-value-bind (r c)
           (file-components-in-component
            module
            (cond ((and (some #'(lambda (dependent)
                                  (member dependent changed))
                              (component-depends-on module))
                        (or (non-empty-listp force)
                            (eq force :new-source-and-dependents)))
                   ;; The component depends on a changed file and force agrees.
                   :all)
                  ((and (non-empty-listp force)
                        (member (component-name module) force
                                :test #'string-equal :key #'string))
                   ;; Force is a list of modules and the component is
                   ;; one of them.
                   :all)
                  (t force)))
         (when c
           (push module changed)
           (setq result (append result r)))))))
  (values result changed))

(setf (symbol-function 'oos) (symbol-function 'operate-on-system))

;;; ********************************
;;; Additional Component Operations
;;; ********************************

;;; *** Edit Operation ***

;;; Should this conditionalization be (or :mcl (and :CCL (not :lispworks)))?
#|
                                     #+:ccl
                                     (defun edit-operation (component force)
"Always returns nil, i.e. component not changed."
(declare (ignore force))
;;
(let* ((full-pathname (make::component-full-pathname component :source))
(already-editing\? #+:mcl (dolist (w (CCL:windows :class
'fred-window))
(when (equal (CCL:window-filename w)
full-pathname)
(return w)))
#-:mcl nil))
(if already-editing\?
#+:mcl (CCL:window-select already-editing\?) #-:mcl nil
(ed full-pathname)))
nil)

                                     #+:allegro
                                     (defun edit-operation (component force)
"Edit a component - always returns nil, i.e. component not changed."
(declare (ignore force))
(let ((full-pathname (component-full-pathname component :source)))
(ed full-pathname))
nil)

                                     #+(or :ccl :allegro)
                                     (make::component-operation :edit 'edit-operation)
                                     #+(or :ccl :allegro)
                                     (make::component-operation 'edit 'edit-operation)
                                     |#

;;; *** Hardcopy System ***
(defparameter *print-command* "enscript -2Gr" ; "lpr"
  "Command to use for printing files on UNIX systems.")
#+:allegro
(defun hardcopy-operation (component force)
  "Hardcopy a component - always returns nil, i.e. component not changed."
  (declare (ignore force))
  (let ((full-pathname (component-full-pathname component :source)))
    (excl:run-shell-command (format nil "~A ~A"
                                    *print-command* full-pathname)))
  nil)

#+:allegro
(make::component-operation :hardcopy 'hardcopy-operation)
#+:allegro
(make::component-operation 'hardcopy 'hardcopy-operation)


;;; *** System Source Size ***

(defun system-source-size (system-name &optional (force :all))
  "Prints a short report and returns the size in bytes of the source files in
   <system-name>."
  (let* ((file-list (files-in-system system-name force :source))
         (total-size (file-list-size file-list)))
    (format t "~&~a/~a (~:d file~:p) totals ~:d byte~:p (~:d kB)"
            system-name force (length file-list)
            total-size (round total-size 1024))
    total-size))

(defun file-list-size (file-list)
  "Returns the size in bytes of the files in <file-list>."
  ;;
  (let ((total-size 0))
    (dolist (file file-list)
      (with-open-file (stream file)
        (incf total-size (file-length stream))))
    total-size))

;;; *** System Tag Table ***

#+:allegro
(defun make-system-tag-table (system-name)
  "Makes an Emacs tag table using the GNU etags program."
  (let ((files-in-system (files-in-system system-name :all :source)))

    (format t "~&Making tag table...")
    (excl:run-shell-command (format nil "etags ~{~a ~}" files-in-system))
    (format t "done.~%")))


;;; end of file -- defsystem.lisp --