1 # Copyright (C) 1991-2013 Free Software Foundation, Inc.
2 # This file is part of the GNU C Library.
4 # The GNU C Library is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU Lesser General Public
6 # License as published by the Free Software Foundation; either
7 # version 2.1 of the License, or (at your option) any later version.
9 # The GNU C Library is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 # Lesser General Public License for more details.
14 # You should have received a copy of the GNU Lesser General Public
15 # License along with the GNU C Library; if not, see
16 # <http://www.gnu.org/licenses/>.
19 # Makefile configuration options for the GNU C library.
22 This makefile requires GNU Make.
25 all: # Make this the default goal
27 ifneq "$(origin +included-Makeconfig)" "file"
29 +included-Makeconfig := yes
35 # $(common-objdir) is the place to put objects and
36 # such that are not specific to a single subdir.
38 objpfx := $(patsubst %//,%/,$(objdir)/$(subdir)/)
39 common-objpfx = $(objdir)/
40 common-objdir = $(objdir)
42 objdir must be defined by the build-directory Makefile.
45 # Root of the sysdeps tree.
46 sysdep_dir := $(..)sysdeps
47 export sysdep_dir := $(sysdep_dir)
49 # Get the values defined by options to `configure'.
50 include $(common-objpfx)config.make
52 # What flags to give to sources which call user provided callbacks
53 uses-callbacks = $(exceptions)
55 # What flags to give to tests which test stack alignment
56 stack-align-test-flags =
58 # Complete path to sysdep dirs.
59 # `configure' writes a definition of `config-sysdirs' in `config.make'.
60 sysdirs := $(foreach D,$(config-sysdirs),$(firstword $(filter /%,$D) $(..)$D))
62 # Add-ons that contribute sysdeps trees get added to the include list
63 # after sysdeps/generic. This makes #include <sysdeps/...> work right
64 # to find specific add-on files without assuming the add-on directory name.
65 # It also means that headers can go into an add-on's base directory
66 # instead of the add-on needing a sysdeps/generic of its own.
67 sysdeps-srcdirs := $(foreach add-on,$(sysdeps-add-ons),\
68 $(firstword $(filter /%,$(add-on)) \
70 +sysdep_dirs = $(sysdirs) $(sysdeps-srcdirs)
72 +sysdep_dirs := $(objdir) $(+sysdep_dirs)
75 # Run config.status to update config.make and config.h. We don't show the
76 # dependence of config.h to Make, because it is only touched when it
77 # changes and so config.status would be run every time; the dependence of
78 # config.make should suffice to force regeneration and re-exec, and the new
79 # image will notice if config.h changed.
80 $(common-objpfx)config.make: $(common-objpfx)config.status \
81 $(..)config.make.in $(..)config.h.in
82 cd $(<D); $(SHELL) $(<F)
84 # Find all the add-on and sysdeps configure fragments, to make sure we
85 # re-run configure when any of them changes.
86 $(common-objpfx)config.status: $(..)version.h $(..)configure \
87 $(foreach dir,$(sysdirs),\
88 $(wildcard $(dir)/Implies) \
90 $(firstword $(wildcard \
91 $(addprefix $(dir)/,configure configure.in))))) \
93 $(foreach add-on,$(add-ons),\
94 $(firstword $(wildcard \
95 $(addprefix $(firstword $(filter /%,$(add-on)) $(..)$(add-on))/,\
96 configure configure.in)))))
97 @cd $(@D); if test -f $(@F); then exec $(SHELL) $(@F) --recheck; else \
98 echo The GNU C library has not been configured. >&2; \
99 echo Run \`configure\' to configure it before building. >&2; \
100 echo Try \`configure --help\' for more details. >&2; \
103 # We don't want CPPFLAGS to be exported to the command running configure.
106 # Get the user's configuration parameters.
107 ifneq ($(wildcard $(..)configparms),)
108 include $(..)configparms
111 ifneq ($(wildcard $(common-objpfx)configparms),)
112 include $(common-objpfx)configparms
117 #### These are the configuration variables. You can define values for
118 #### the variables below in the file `configparms'.
119 #### Do NOT edit this file.
123 # Common prefix for machine-independent installation directories.
124 ifeq ($(origin prefix),undefined) # ifndef would override explicit empty value.
128 # Decide whether we shall build the programs or not. We always do this
129 # unless the user tells us (in configparms) or we are building for a
131 ifndef build-programs
132 ifneq ($(config-os),none)
139 # Common prefix for machine-dependent installation directories.
140 ifeq ($(origin exec_prefix),undefined)
141 exec_prefix = $(prefix)
144 # Where to install the library and object files.
146 libdir = $(exec_prefix)/lib
148 inst_libdir = $(install_root)$(libdir)
150 # Where to install the shared library and dynamic linker.
152 slibdir = $(exec_prefix)/lib
154 inst_slibdir = $(install_root)$(slibdir)
156 # Prefix to put on files installed in $(libdir). For libraries `libNAME.a',
157 # the prefix is spliced between `lib' and the name, so the linker switch
158 # `-l$(libprefix)NAME' finds the library; for other files the prefix is
159 # just prepended to the whole file name.
160 ifeq ($(origin libprefix),undefined)
164 # Where to install the header files.
166 includedir = $(prefix)/include
168 inst_includedir = $(install_root)$(includedir)
170 # Where to install machine-independent data files.
171 # These are the timezone database, and the locale database.
173 datadir = $(prefix)/share
175 inst_datadir = $(install_root)$(datadir)
177 # Where to install the timezone data files (which are machine-independent).
179 zonedir = $(datadir)/zoneinfo
181 inst_zonedir = $(install_root)$(zonedir)
183 # Where to install the locale files.
185 localedir = $(libdir)/locale
187 inst_localedir = $(install_root)$(localedir)
189 # Where to install the message catalog data files (which are
190 # machine-independent).
192 msgcatdir = $(datadir)/locale
194 inst_msgcatdir = $(install_root)$(msgcatdir)
196 # Where to install the locale charmap source files.
198 i18ndir = $(datadir)/i18n
200 inst_i18ndir = $(install_root)$(i18ndir)
202 # Where to install the shared object for charset transformation.
204 gconvdir = $(libdir)/gconv
206 inst_gconvdir = $(install_root)$(gconvdir)
208 # Where to install programs.
210 bindir = $(exec_prefix)/bin
212 inst_bindir = $(install_root)$(bindir)
214 # Where to install internal programs.
216 libexecdir = $(exec_prefix)/libexec
218 inst_libexecdir = $(install_root)$(libexecdir)
220 # Where to install administrative programs.
222 rootsbindir = $(exec_prefix)/sbin
224 inst_rootsbindir = $(install_root)$(rootsbindir)
227 sbindir = $(exec_prefix)/sbin
229 inst_sbindir = $(install_root)$(sbindir)
231 # Where to install the Info files.
233 infodir = $(prefix)/info
235 inst_infodir = $(install_root)$(infodir)
237 # Where to install audit libraries.
239 auditdir = $(libdir)/audit
241 inst_auditdir = $(install_root)$(auditdir)
243 # Where to install default configuration files. These include the local
244 # timezone specification and network data base files.
246 sysconfdir = $(prefix)/etc
248 inst_sysconfdir = $(install_root)$(sysconfdir)
250 # Directory for the database files and Makefile for nss_db.
252 vardbdir = $(localstatedir)/db
254 inst_vardbdir = $(install_root)$(vardbdir)
256 # Where to install the "localtime" timezone file; this is the file whose
257 # contents $(localtime) specifies. If this is a relative pathname, it is
258 # relative to $(zonedir). It is a good idea to put this somewhere
259 # other than there, so the zoneinfo directory contains only universal data,
260 # localizing the configuration data elsewhere.
261 ifndef localtime-file
262 localtime-file = $(sysconfdir)/localtime
265 # What to use for leap second specifications in compiling the default
266 # timezone files. Set this to `/dev/null' for no leap second handling as
267 # 1003.1 requires, or to `leapseconds' for proper leap second handling.
268 # Both zone flavors are always available as `posix/ZONE' and `right/ZONE'.
269 # This variable determines the default: if it's `/dev/null',
270 # ZONE==posix/ZONE; if it's `leapseconds', ZONE==right/ZONE.
272 leapseconds = /dev/null
275 # What timezone's DST rules should be used when a POSIX-style TZ
276 # environment variable doesn't specify any rules. For 1003.1 compliance
277 # this timezone must use rules that are as U.S. federal law defines DST.
278 # Run `make -C time echo-zonenames' to see a list of available zone names.
279 # This setting can be changed with `zic -p TIMEZONE' at any time.
280 # If you want POSIX.1 compatibility, use `America/New_York'.
282 posixrules = America/New_York
285 # Where to install the "posixrules" timezone file; this is file
286 # whose contents $(posixrules) specifies. If this is a relative
287 # pathname, it is relative to $(zonedir).
288 ifndef posixrules-file
289 posixrules-file = posixrules
293 # Directory where your system's native header files live.
294 # This is used on Unix systems to generate some GNU libc header files.
296 sysincludedir = /usr/include
300 # Commands to install files.
302 INSTALL_DATA = $(INSTALL) -m 644
304 ifndef INSTALL_SCRIPT
305 INSTALL_SCRIPT = $(INSTALL)
307 ifndef INSTALL_PROGRAM
308 INSTALL_PROGRAM = $(INSTALL)
315 # The name of the C compiler.
316 # If you've got GCC, and it works, use it.
317 ifeq ($(origin CC),default)
321 # The name of the C compiler to use for compilations of programs to run on
322 # the host that is building the library. If you set CC to a
323 # cross-compiler, you must set this to the normal compiler.
328 # Default flags to pass the C compiler.
329 ifndef default_cflags
330 ifeq ($(release),stable)
331 default_cflags := -g -O2
333 default_cflags := -g -O
337 # Flags to pass the C compiler when assembling preprocessed assembly code
338 # (`.S' files). On some systems the assembler doesn't understand the `#' line
339 # directives the preprocessor produces. If you have troubling compiling
340 # assembly code, try using -P here to suppress these directives.
345 as-needed := -Wl,--as-needed
346 no-as-needed := -Wl,--no-as-needed
348 # Must be supported by the linker.
349 no-whole-archive = -Wl,--no-whole-archive
350 whole-archive = -Wl,--whole-archive
352 # Installed name of the startup code.
353 # The ELF convention is that the startfile is called crt1.o
354 start-installed-name = crt1.o
355 # On systems that do not need a special startfile for statically linked
356 # binaries, simply set it to the normal name.
357 ifndef static-start-installed-name
358 static-start-installed-name = $(start-installed-name)
361 ifeq (yesyes,$(build-shared)$(have-z-combreloc))
362 combreloc-LDFLAGS = -Wl,-z,combreloc
363 LDFLAGS.so += $(combreloc-LDFLAGS)
364 LDFLAGS-rtld += $(combreloc-LDFLAGS)
367 relro-LDFLAGS = -Wl,-z,relro
368 LDFLAGS.so += $(relro-LDFLAGS)
369 LDFLAGS-rtld += $(relro-LDFLAGS)
371 ifeq (yes,$(have-hash-style))
372 # For the time being we unconditionally use 'both'. At some time we
373 # should declare statically linked code as 'out of luck' and compile
374 # with --hash-style=gnu only.
375 hashstyle-LDFLAGS = -Wl,--hash-style=both
376 LDFLAGS.so += $(hashstyle-LDFLAGS)
377 LDFLAGS-rtld += $(hashstyle-LDFLAGS)
380 # Command for linking PIE programs with the C library.
382 +link-pie = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
383 $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
384 $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
385 $(addprefix $(csu-objpfx),S$(start-installed-name)) \
386 $(+preinit) $(+prectorS) \
387 $(filter-out $(addprefix $(csu-objpfx),start.o \
388 S$(start-installed-name))\
389 $(+preinit) $(link-extra-libs) \
390 $(common-objpfx)libc% $(+postinit),$^) \
391 $(link-extra-libs) $(link-libc) $(+postctorS) $(+postinit)
393 # Command for statically linking programs with the C library.
395 +link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \
396 $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
397 $(addprefix $(csu-objpfx),$(static-start-installed-name)) \
398 $(+preinit) $(+prectorT) \
399 $(filter-out $(addprefix $(csu-objpfx),start.o \
400 $(start-installed-name))\
401 $(+preinit) $(link-extra-libs-static) \
402 $(common-objpfx)libc% $(+postinit),$^) \
403 $(link-extra-libs-static)
404 +link-static-after-libc = $(+postctorT) $(+postinit)
405 +link-static = $(+link-static-before-libc) $(link-libc-static) \
406 $(+link-static-after-libc)
407 +link-static-tests = $(+link-static-before-libc) $(link-libc-static-tests) \
408 $(+link-static-after-libc)
410 # Commands for linking programs with the C library.
412 ifeq (yes,$(build-shared))
413 +link-before-libc = $(CC) -nostdlib -nostartfiles -o $@ \
414 $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F)) \
415 $(combreloc-LDFLAGS) $(relro-LDFLAGS) $(hashstyle-LDFLAGS) \
416 $(addprefix $(csu-objpfx),$(start-installed-name)) \
417 $(+preinit) $(+prector) \
418 $(filter-out $(addprefix $(csu-objpfx),start.o \
419 $(start-installed-name))\
420 $(+preinit) $(link-extra-libs) \
421 $(common-objpfx)libc% $(+postinit),$^) \
423 +link-after-libc = $(+postctor) $(+postinit)
424 +link = $(+link-before-libc) $(link-libc) $(+link-after-libc)
425 +link-tests = $(+link-before-libc) $(link-libc-tests) $(+link-after-libc)
427 +link = $(+link-static)
428 +link-tests = $(+link-static-tests)
431 # Command for statically linking bounded-pointer programs with the C library.
433 +link-bounded = $(CC) -nostdlib -nostartfiles -static -fbounded-pointers -o $@ \
434 $(sysdep-LDFLAGS) $(LDFLAGS) \
435 $(addprefix $(csu-objpfx),b$(static-start-installed-name)) \
436 $(+preinit) $(+prectorT) \
437 $(filter-out $(addprefix $(csu-objpfx),start.ob \
438 $(start-installed-name))\
439 $(+preinit) $(link-extra-libs-bounded) \
440 $(common-objpfx)libc% $(+postinit),$^) \
441 $(link-extra-libs-bounded) $(link-libc-bounded) $(+postctorT) $(+postinit)
443 ifndef config-LDFLAGS
444 ifeq (yes,$(build-shared))
445 config-LDFLAGS = -Wl,-dynamic-linker=$(slibdir)/$(rtld-installed-name)
449 ifeq (yes,$(build-shared))
450 # We need the versioned name of libc.so in the deps of $(others) et al
451 # so that the symlink to libc.so is created before anything tries to
452 # run the linked programs.
453 link-libc-before-gnulib = -Wl,-rpath-link=$(rpath-link) \
454 $(common-objpfx)libc.so$(libc.so-version) \
455 $(common-objpfx)$(patsubst %,$(libtype.oS),c) \
456 $(as-needed) $(common-objpfx)elf/ld.so $(no-as-needed)
457 link-libc = $(link-libc-before-gnulib) $(gnulib)
458 link-libc-tests = $(link-libc-before-gnulib) $(gnulib-tests)
459 # This is how to find at build-time things that will be installed there.
460 rpath-dirs = math elf dlfcn nss nis rt resolv crypt
462 $(common-objdir):$(subst $(empty) ,:,$(patsubst ../$(subdir),.,$(rpath-dirs:%=$(common-objpfx)%)))
464 link-libc = $(common-objpfx)libc.a $(otherlibs) $(gnulib) $(common-objpfx)libc.a $(gnulib)
465 link-libc-tests = $(common-objpfx)libc.a $(otherlibs) $(gnulib-tests) $(common-objpfx)libc.a $(gnulib-tests)
469 elfobjdir := $(patsubst ../$(subdir),.,$(common-objpfx)elf)
471 # Differences in the linkers on the various platforms.
472 LDFLAGS-rpath-ORIGIN = -Wl,-rpath,'$$ORIGIN'
473 LDFLAGS-soname-fname = -Wl,-soname,$(@F)
474 LDFLAGS-rdynamic = -rdynamic
475 LDFLAGS-Bsymbolic = -Bsymbolic
477 # Choose the default search path for the dynamic linker based on
478 # where we will install libraries.
479 ifneq ($(libdir),$(slibdir))
480 default-rpath = $(slibdir):$(libdir)
482 default-rpath = $(libdir)
485 ifndef link-extra-libs
486 link-extra-libs = $(LDLIBS-$(@F))
487 link-extra-libs-static = $(link-extra-libs)
488 link-extra-libs-bounded = $(link-extra-libs)
491 # The static libraries.
492 link-libc-static = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib) -Wl,--end-group
493 link-libc-static-tests = -Wl,--start-group $(common-objpfx)libc.a $(static-gnulib-tests) -Wl,--end-group
494 link-libc-bounded = $(common-objpfx)libc_b.a $(gnulib) $(common-objpfx)libc_b.a
496 # How to link against libgcc. Some libgcc functions, such as those
497 # for "long long" arithmetic or software floating point, can always be
498 # built without use of C library headers and do not have any global
499 # state so can safely be linked statically into any executable or
500 # shared library requiring them; these functions are in libgcc.a.
501 # Other functions, relating to exception handling, may require C
502 # library headers to build and it may not be safe to have more than
503 # one copy of them in a process; these functions are only in
504 # libgcc_s.so and libgcc_eh.a.
506 # To avoid circular dependencies when bootstrapping, it is desirable
507 # to avoid use of libgcc_s and libgcc_eh in building glibc. Where any
508 # glibc functionality (in particular, thread cancellation) requires
509 # exception handling, this is implemented through dlopen of libgcc_s
510 # to avoid unnecessary dependencies on libgcc_s by programs not using
511 # that functionality; executables built with glibc do not use
512 # exception handling other than through thread cancellation.
514 # Undefined references to functions from libgcc_eh or libgcc_s may
515 # arise for code built with -fexceptions. In the case of statically
516 # linked programs installed by glibc, unwinding will never actually
517 # occur at runtime and the use of elf/static-stubs.c to resolve these
518 # references is safe. In the case of statically linked test programs
519 # and test programs built with -fexceptions, unwinding may occur in
520 # some cases and it is preferable to link with libgcc_eh or libgcc_s
521 # so that the testing is as similar as possible to how programs will
522 # be built with the installed glibc.
524 # Some architectures have architecture-specific systems for exception
525 # handling that may involve undefined references to
526 # architecture-specific functions. On those architectures,
527 # gnulib-arch and static-gnulib-arch may be defined in sysdeps
528 # makefiles to use additional libraries for linking executables and
529 # shared libraries built by glibc.
531 ifneq ($(have-cc-with-libunwind),yes)
536 libgcc_eh := -Wl,--as-needed -lgcc_s $(libunwind) -Wl,--no-as-needed
538 gnulib = -lgcc $(gnulib-arch)
539 gnulib-tests := -lgcc $(libgcc_eh)
541 # By default, elf/static-stubs.o, instead of -lgcc_eh, is used to
542 # statically link programs. When --disable-shared is used, we use
543 # -lgcc_eh since elf/static-stubs.o isn't sufficient.
544 ifeq (yes,$(build-shared))
545 static-gnulib = -lgcc $(static-gnulib-arch)
547 static-gnulib = -lgcc -lgcc_eh $(static-gnulib-arch)
549 static-gnulib-tests := -lgcc -lgcc_eh $(libunwind)
550 libc.so-gnulib := -lgcc
552 +preinit = $(addprefix $(csu-objpfx),crti.o)
553 +postinit = $(addprefix $(csu-objpfx),crtn.o)
554 +prector = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbegin.o`
555 +postctor = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
556 # Variants of the two previous definitions for linking PIE programs.
557 +prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o`
558 +postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o`
559 # Variants of the two previous definitions for statically linking programs.
560 +prectorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginT.o`
561 +postctorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
562 +interp = $(addprefix $(elf-objpfx),interp.os)
563 csu-objpfx = $(common-objpfx)csu/
564 elf-objpfx = $(common-objpfx)elf/
566 # A command that, prepended to the name and arguments of a program,
567 # and run on the build system, causes that program with those
568 # arguments to be run on the host for which the library is built.
572 # Likewise, but the name of the program is preceded by
573 # <variable>=<value> assignments for environment variables.
574 ifndef test-wrapper-env
575 test-wrapper-env = $(test-wrapper) env
578 # Whether to run test programs built for the library's host system.
579 ifndef run-built-tests
580 ifeq (yes|,$(cross-compiling)|$(test-wrapper))
583 run-built-tests = yes
587 # How to run a program we just linked with our library.
588 # The program binary is assumed to be $(word 2,$^).
589 built-program-file = $(dir $(word 2,$^))$(notdir $(word 2,$^))
590 ifeq (yes,$(build-shared))
592 sysdep-library-path = \
593 $(subst $(empty) ,:,$(strip $(patsubst -Wl$(comma)-rpath-link=%, %,\
594 $(filter -Wl$(comma)-rpath-link=%,\
595 $(sysdep-LDFLAGS)))))
596 # $(run-via-rtld-prefix) is a command that, when prepended to the name
597 # of a program built with the newly built library, produces a command
598 # that, executed on the host for which the library is built, runs that
599 # program. For the statically-linked %-bp test programs, and for
600 # tests listed in tests-static or xtests-static, it is empty.
601 run-via-rtld-prefix = \
602 $(if $(strip $(filter $(notdir $(built-program-file)), \
603 $(tests-static) $(xtests-static)) \
604 $(filter %-bp,$(built-program-file))),, \
605 $(elf-objpfx)$(rtld-installed-name) \
606 --library-path $(rpath-link)$(patsubst %,:%,$(sysdep-library-path)))
608 run-via-rtld-prefix =
610 # $(run-program-prefix) is a command that, when prepended to the name
611 # of a program built with the newly built library, produces a command
612 # that, executed on the build system on which "make" is run, runs that
614 run-program-prefix = $(test-wrapper) $(run-via-rtld-prefix)
615 # $(built-program-cmd) is a command that, executed on the build system
616 # on which "make" is run, runs the newly built program that is the
617 # second dependency of the makefile target in which
618 # $(built-program-cmd) is used.
619 built-program-cmd = $(test-wrapper) \
620 $(run-via-rtld-prefix) $(built-program-file)
621 # $(host-built-program-cmd) is a command that, executed on the host
622 # for which the library is built, runs the newly built program that is
623 # the second dependency of the makefile target in which
624 # $(host-built-program-cmd) is used.
625 host-built-program-cmd = $(run-via-rtld-prefix) $(built-program-file)
631 # Extra flags to pass to GCC.
632 ifeq ($(all-warnings),yes)
633 +gccwarn := -Wall -Wwrite-strings -Winline -Wcast-qual -Wbad-function-cast -Wmissing-noreturn -Wmissing-prototypes -Wmissing-declarations -Wcomment -Wcomments -Wtrigraphs -Wsign-compare -Wfloat-equal -Wmultichar
635 +gccwarn := -Wall -Wwrite-strings -Winline
637 +gccwarn-c = -Wstrict-prototypes
639 # We do not depend on the address of constants in different files to be
640 # actually different, so allow the compiler to merge them all.
641 +merge-constants = -fmerge-all-constants
643 # We have to assume that glibc functions are called in any rounding
644 # mode and also change the rounding mode in a few functions. So,
645 # disable any optimization that assume default rounding mode.
646 +math-flags = -frounding-math
648 # This is the program that generates makefile dependencies from C source files.
649 # The -MP flag tells GCC >= 3.2 (which we now require) to produce dummy
650 # targets for headers so that removed headers don't break the build.
652 +mkdep = $(CC) -M -MP
655 # The program that makes Emacs-style TAGS files.
658 # The `xgettext' program for producing .pot files from sources.
663 # The `m4' macro processor; this is used by sysdeps/sparc/Makefile (and
664 # perhaps others) to preprocess assembly code in some cases.
667 # To force installation of files even if they are older than the
668 # installed files. This variable is included in the dependency list
669 # of all installation targets.
670 ifeq ($(force-install),yes)
671 +force = force-install
677 #### End of configuration variables.
680 # This tells some versions of GNU make before 3.63 not to export all variables.
683 # We want to echo the commands we're running without
684 # umpteen zillion filenames along with it (we use `...' instead)
685 # but we don't want this echoing done when the user has said
686 # he doesn't want to see commands echoed by using -s.
687 ifneq "$(findstring s,$(MAKEFLAGS))" "" # if -s
688 +cmdecho := echo >/dev/null
693 # These are the flags given to the compiler to tell
694 # it what sort of optimization and/or debugging output to do.
696 # If `CFLAGS' was defined, use that.
698 +cflags := $(filter-out -I%,$(CFLAGS))
702 # If none of the above worked, default to "-g -O".
703 ifeq "$(strip $(+cflags))" ""
704 +cflags := $(default_cflags)
705 endif # $(+cflags) == ""
707 +cflags += $(cflags-cpu) $(+gccwarn) $(+merge-constants) $(+math-flags)
710 # Don't duplicate options if we inherited variables from the parent.
711 +cflags := $(sort $(+cflags))
713 # These are flags given to the C compiler to tell it to look for
714 # include files (including ones given in angle brackets) in the parent
715 # library source directory, in the include directory, and in the
717 +sysdep-includes = $(addprefix -I,$(+sysdep_dirs))
718 +includes = -I$(..)include $(if $(subdir),$(objpfx:%/=-I%)) \
719 $(+sysdep-includes) $(includes) \
720 $(patsubst %/,-I%,$(..)) $(libio-include) -I. $(sysincludes)
722 # Since libio has several internal header files, we use a -I instead
723 # of many little headers in the include directory.
724 libio-include = -I$(..)libio
726 # These are the variables that the implicit compilation rules use.
727 # Note that we can't use -std=* in CPPFLAGS, because it overrides
728 # the implicit -lang-asm and breaks cpp behavior for .S files--notably
729 # it causes cpp to stop predefining __ASSEMBLER__.
730 CPPFLAGS = $(CPPUNDEFS) $(CPPFLAGS-config) $($(subdir)-CPPFLAGS) \
731 $(+includes) $(defines) \
732 -include $(..)include/libc-symbols.h $(sysdep-CPPFLAGS) \
733 $(CPPFLAGS-$(suffix $@)) \
734 $(foreach lib,$(libof-$(basename $(@F))) \
735 $(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \
736 $(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))
737 override CFLAGS = -std=gnu99 $(gnu89-inline-CFLAGS) $(config-extra-cflags) \
738 $(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
739 $(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
741 $(foreach lib,$(libof-$(basename $(@F))) \
742 $(libof-$(<F)) $(libof-$(@F)),$(CFLAGS-$(lib)))
743 override CXXFLAGS = $(c++-sysincludes) \
744 $(filter-out %frame-pointer,$(+cflags)) $(sysdep-CFLAGS) \
745 $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) $(CFLAGS-$(@F))
747 # If everything is compiled with -fPIC (implicitly) we must tell this by
748 # defining the PIC symbol.
749 ifeq (yes,$(build-pic-default))
753 # Enable object files for different versions of the library.
754 # Various things use $(object-suffixes) to know what all to make.
755 # The compilation rules use $(CPPFLAGS-${SUFFIX}) and $(CFLAGS-${SUFFIX})
756 # to pass different flags for each flavor.
757 libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
758 all-object-suffixes := .o .os .op .og .ob .oS
760 CPPFLAGS-.o = $(pic-default)
761 CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
763 object-suffixes += .o
764 ifeq (yes,$(build-shared))
765 # Under --enable-shared, we will build a shared library of PIC objects.
766 # The PIC object files are named foo.os.
767 object-suffixes += .os
768 CPPFLAGS-.os = -DPIC -DSHARED
769 CFLAGS-.os = $(filter %frame-pointer,$(+cflags)) $(pic-ccflag)
770 libtype.os := lib%_pic.a
771 # This can be changed by a sysdep makefile
773 # This one should always stay like this unless there is a very good reason.
776 # This can be changed by a sysdep makefile
778 # This one should always stay like this unless there is a very good reason.
780 ifeq (yes,$(build-profile))
781 # Under --enable-profile, we will build a static library of profiled objects.
782 # The profiled object files are named foo.op.
783 object-suffixes += .op
784 CPPFLAGS-.op = -DPROF $(pic-default)
786 libtype.op = lib%_p.a
789 # Convenience variable for when we want to treat shared-library cases
790 # differently from the rest.
791 object-suffixes-noshared := $(filter-out .os,$(object-suffixes))
794 ifeq (yes,$(build-bounded))
795 # Under --enable-bounded, we build the library with `-fbounded-pointers -g'
796 # to runtime bounds checking. The bounded-pointer objects are named foo.ob.
797 # We disable sibling-call optimizations so that stack traces will be complete
798 # and thus aid debugging, since after all, BPs are a debugging tool.
799 object-suffixes += .ob
800 CPPFLAGS-.ob = -fbounded-pointers $(pic-default)
801 CFLAGS-.ob = -g -O2 -fno-optimize-sibling-calls -fno-strict-aliasing
802 libtype.ob = lib%_b.a
805 object-suffixes-for-libc := $(object-suffixes)
807 ifeq (yes,$(build-shared))
808 # Build special library that contains the static-only routines for libc.
809 object-suffixes-for-libc += .oS
811 # Must build the routines as PIC, though, because they can end up in (users')
812 # shared objects. We don't want to use CFLAGS-os because users may, for
813 # example, make that processor-specific.
814 CFLAGS-.oS = $(CFLAGS-.o) $(PIC-ccflag)
815 CPPFLAGS-.oS = $(CPPFLAGS-.o) -DPIC -DLIBC_NONSHARED=1
816 libtype.oS = lib%_nonshared.a
819 # The assembler can generate debug information too.
821 ASFLAGS := $(filter -g% -fdebug-prefix-map=%,$(CFLAGS))
823 ASFLAGS += $(ASFLAGS-config) $(asflags-cpu)
829 move-if-change = $(SHELL) $(..)scripts/move-if-change
831 -include $(common-objpfx)sysd-sorted
832 subdirs = $(sorted-subdirs)
833 subdir-srcdirs = $(foreach dir,$(subdirs),\
834 $(firstword $($(dir)-srcdir) $(..)$(dir)))
836 ifeq (yes, $(build-shared))
838 # This is a pair of implicit rules to preprocess a file with # comments,
839 # %ifdef et al, based on config.h settings or other %include'd files.
840 # We use chained rules instead of a pipeline here so that we can properly
841 # check the exit status of cpp rather than using its bad output when there
842 # is a preprocessing error. Another rule should depend on the output file
843 # `FOO.v', and along with that `FOO.v.i' should be given dependencies
844 # listing both its input files, and any header files that it may reference
846 %.v.i: $(common-objpfx)config.h $(..)Makeconfig
847 sed '/^[ ]*%/!s/#.*$$//;/^[ ]*$$/d;s/^[ ]*%/#/' \
848 $(filter-out FORCE %.h $(..)Makeconfig,$^) \
849 | $(CC) -E -undef $(CPPFLAGS) -x assembler-with-cpp - \
853 sed '/^[ ]*#/d;/^[ ]*$$/d' $< > $@T
856 # To generate a header to support more than one ABI for different
857 # architecture variants, the CPU/Makefile defines abi-variants to be a
858 # list of names for those variants (e.g. 32 64), and, for each variant,
859 # defines abi-$(variant)-condition to be the condition for those options
860 # to use in a C #if condition. abi-includes may be defined to a list of
861 # headers to include in the generated header, if the default does not
862 # suffice. default-abi is defined to be the ABI for the current glibc
866 abi-includes := bits/wordsize.h
869 # Process the shlib-versions file, which tells us what shared library
870 # version numbers to use when we install shared objects on this system.
871 # We need to wait until $(subdirs) is complete.
872 ifeq ($(sysd-sorted-done),t)
873 -include $(common-objpfx)soversions.mk
874 ifndef avoid-generated
875 # This lets add-ons give more-specific matches that override defaults
876 # in the top-level file.
877 $(common-objpfx)shlib-versions.v.i: \
878 $(wildcard $(+sysdep_dirs:=/shlib-versions) \
879 $(subdir-srcdirs:=/shlib-versions)) \
882 soversions-default-setname = $(patsubst %, %,\
883 $(filter-out %_default,\
884 $(oldest-abi:%=GLIBC_%)))
885 $(common-objpfx)soversions.i: $(..)scripts/soversions.awk \
886 $(common-objpfx)shlib-versions.v
887 $(AWK) -v default_setname='$(soversions-default-setname)' \
888 -v cpu='$(config-machine)' \
889 -v vendor='$(config-vendor)' \
890 -v os='$(config-os)' \
893 $(common-objpfx)soversions.mk: $(common-objpfx)soversions.i $(..)Makeconfig
894 (while read which lib number setname; do \
895 eval seen_$$which=1; \
896 test x"$$which" != xABI || echo abi-name = "$$lib"; \
897 test x"$$which" = xDEFAULT || continue; \
899 [0-9]*) echo "$$lib.so-version=.$$number"; \
900 echo "all-sonames+=$$lib=$$lib.so\$$($$lib.so-version)";;\
901 *) echo "$$lib.so-version=\$$(if \$$(abi-$(default-abi)-$$lib-soname),\$$(abi-$(default-abi)-$$lib-soname),$$number)"; \
902 echo "all-sonames+=$$lib=\$$($$lib.so-version)";;\
905 echo soversions.mk-done = t;) < $< > $@T; exit 0
910 postclean-generated += soversions.mk soversions.i \
911 shlib-versions.v shlib-versions.v.i
913 # Generate the header containing the names of all shared libraries.
914 # We use a stamp file to avoid unnecessary recompilations.
915 before-compile += $(common-objpfx)gnu/lib-names.h
916 ifeq ($(soversions.mk-done),t)
917 $(common-objpfx)gnu/lib-names.h: $(common-objpfx)gnu/lib-names.stmp; @:
918 $(common-objpfx)gnu/lib-names.stmp: $(..)scripts/lib-names.awk \
919 $(common-objpfx)soversions.i
920 $(make-target-directory)
922 echo '/* This file is automatically generated.';\
923 echo ' It defines macros to allow user program to find the shared'; \
924 echo ' library files which come as part of GNU libc. */'; \
925 echo '#ifndef __GNU_LIB_NAMES_H'; \
926 echo '#define __GNU_LIB_NAMES_H 1'; \
928 $(if $(abi-includes), \
929 $(foreach h,$(abi-includes), echo '#include <$(h)>';) \
931 $(if $(abi-variants), \
932 $(foreach v,$(abi-variants),\
933 $(if $(abi-$(v)-condition),\
934 echo '#if $(abi-$(v)-condition)'; \
935 ($(foreach s,$(all-sonames), \
936 $(if $(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname),\
937 echo $(firstword $(subst =, ,$(s)))=$(abi-$(v)-$(firstword $(subst =, ,$(s)))-soname);, \
939 | LC_ALL=C $(AWK) -v multi=1 -f $(firstword $^) | LC_ALL=C sort;) \
940 $(if $(abi-$(v)-condition),echo '#endif';)), \
941 ($(foreach s,$(all-sonames), echo $(s);)) \
942 | LC_ALL=C $(AWK) -f $(firstword $^) | LC_ALL=C sort;) \
944 echo '#endif /* gnu/lib-names.h */'; \
946 $(move-if-change) ${@:stmp=T} ${@:stmp=h}
950 common-generated += gnu/lib-names.h gnu/lib-names.stmp
952 # The name under which the run-time dynamic linker is installed.
953 # We are currently going for the convention that `/lib/ld.so.1'
954 # names the SVR4/ELF ABI-compliant dynamic linker.
955 ifndef rtld-installed-name
957 rtld-installed-name = $(ld.so-version)
959 rtld-installed-name = ld.so.1
963 ifndef rtld-version-installed-name
964 rtld-version-installed-name = ld-$(version).so
970 ifeq ($(build-shared),yes)
971 libdl = $(common-objpfx)dlfcn/libdl.so$(libdl.so-version)
973 libdl = $(common-objpfx)dlfcn/libdl.a
976 ifeq ($(build-shared),yes)
977 libm = $(common-objpfx)math/libm.so$(libm.so-version)
979 libm = $(common-objpfx)math/libm.a
982 # These are the subdirectories containing the library source. The order
983 # is more or less arbitrary. The sorting step will take care of the
985 all-subdirs = csu assert ctype locale intl catgets math setjmp signal \
986 stdlib stdio-common libio malloc string wcsmbs time dirent \
987 grp pwd posix io termios resource misc socket sysvipc gmon \
988 gnulib iconv iconvdata wctype manual shadow gshadow po argp \
989 crypt nss localedata timezone rt conform debug \
990 $(add-on-subdirs) dlfcn elf
992 ifndef avoid-generated
993 all-Depend-files := $(wildcard $(foreach dir,$(all-subdirs),\
994 $(firstword $($(dir)-srcdir) \
995 $(..)$(dir))/Depend))
996 $(common-objpfx)sysd-sorted: $(..)scripts/gen-sorted.awk \
997 $(common-objpfx)config.make $(..)Makeconfig \
998 $(wildcard $(sysdirs:=/Subdirs)) \
1001 -v subdirs='$(all-subdirs)' \
1003 $(filter %/Subdirs %/Depend,$^) > $@-tmp
1005 $(all-Depend-files): ;
1008 # This gives partial TARGET:SOURCE pattern pairs to have rules
1009 # emitted into sysd-rules. A sysdeps Makeconfig fragment can
1010 # add its own special object file prefix to this list with e.g. foo-%:%
1011 # to have foo-*.? compiled from *.? using $(foo-CPPFLAGS).
1012 sysd-rules-patterns := %:% rtld-%:rtld-% rtld-%:% m_%:s_%
1014 # Let sysdeps/ subdirs contain a Makeconfig fragment for us to include here.
1015 sysdep-makeconfigs := $(wildcard $(+sysdep_dirs:=/Makeconfig))
1016 ifneq (,$(sysdep-makeconfigs))
1017 include $(sysdep-makeconfigs)
1020 # Compute just the target patterns. Makeconfig has set sysd-rules-patterns.
1021 sysd-rules-targets := $(sort $(foreach p,$(sysd-rules-patterns),\
1022 $(firstword $(subst :, ,$p))))
1024 # A sysdeps Makeconfig fragment may set libc-reentrant to yes.
1025 ifeq (yes,$(libc-reentrant))
1026 defines += -D_LIBC_REENTRANT
1028 libio-mtsafe = -D_IO_MTSAFE_IO
1031 endif # Makeconfig not yet included