ENH: Reworked the symlink handling of loadable libraries

[freefoam.git] / CMake / FOAMUse.cmake.in

# - Use module for @PROJECT_NAME@
# Sets up a CMake project to use @PROJECT_NAME@. It is assumend that
# @PROJECT_NAME@Config.cmake has already been loaded.
#
# Typical usage might look like this:
#
#  cmake_minimum_required(VERSION 2.8)
#  project(some_project CXX)
#  find_package(@PROJECT_NAME@ REQUIRED)
#  include(${FOAM_USE_FILE})
#  foam_add_library(some_library lib_src.C)
#  foam_add_executable(some_solver sol_src.C)
#  target_link_libraries(some_solver some_library FOAM_finiteVolume)
#
# Note that all functions are prefixed by foam_ and that linking against
# @PROJECT_NAME@ libraries requires prefixing FOAM_ to their name in order to
# avoid name-clashes.
#
# BRIEF FUNCTION DESCRIPTIONS
#
# This module defines the following functions to help building and installing
# @PROJECT_NAME@ libraries and executables. The Descriptions given are only
# very brief, refer to the full documentations below for detailed instructions.
#
#  - foam_add_library:
#        Create a @PROJECT_NAME@ library
#  - foam_add_executable
#        Create a @PROJECT_NAME@ executable
#  - foam_add_target_to_build_tree_export
#        Add target to the build-tree export-set. This is only used if other
#        CMake-based projects want to import this target directly from the
#        build-tree.
#  - foam_export_to_build_tree
#        Create the export-set in the build-tree.
#  - foam_install_targets
#        Install @PROJECT_NAME@ targets.
#  - foam_create_include_wrappers
#        Creates include-wrapper files in ${CMAKE_BINARY_DIR}/include, making
#        it possible to have include-statements of the form:
#          #include <libName/fileName.H>
#  - foam_check_and_compile_flex
#        Checks a list of source files whether they contain any .L (flex++)
#        sources. If they are found, it creates targets to compile these
#        and replaces their occurences in the source file list by the C++
#        output file.
#  - foam_link_loadable_library
#        Creates a symbolic link to the (framework) library into the plugins
#        directory, allowing it to be loaded using dlopen.
#  - foam_add_executable_to_doc_index
#        Adds an executable to the Doxygen documentation index. This index
#        is consulted by @PROJECT_NAME@ executables when they are being called
#        with the -help option.
#  - foam_write_doc_index
#        Writes above described documentation index to a file.
#  - foam_create_manpage
#        Creates a manpage either from Doxygen source or from the header
#        comments in a source file.
#  - foam_dependent_variables
#        Makes a list of variables depend on another variable. When the
#        cache-value of this variable changes, the dependent variables are
#        removed from the cache and are undefined.
#  - foam_configure_files
#        Configure a list of files using transformation rules which can be
#        different for the build- and install-tree. Also allows renaming of the
#        file.
#  - foam_install_configured_files
#        Install files created using foam_configure_files().
#  - foam_parse_arguments
#        Common function useful for argument parsing when writing custom macros
#        and functions.
#  - foam_compile_asy
#        Create images from Asymptote sources.
#  - foam_fix_apple_gcc_bug
#        Work around buggy Apple g++-4.2 where -O3 generates bad code. This is
#        an internal function.
#
# DETAILED FUNCTION DOCUMENTATION
#
#  FOAM_ADD_LIBRARY(<target> [STATIC | SHARED | MODULE]
#                   [<src> ...] [PUBLIC_HEADERS <hdr> ...]
#                   [[EXPORT <export_set>] | SKIP_EXPORT])
#
# Adds a @PROJECT_NAME@ library with the target name <target>. Optionally, you
# can specify STATIC, SHARED or MODULE to determine the library-type that is
# build. Refer to the documenation of add_library() for the details. <src> ...
# are all source files. Files following PUBLIC_HEADERS are header files which
# are to be installed. If no sources are given, the function requires that the
# file ${CMAKE_CURRENT_SOURCE_DIR}/files.cmake exists which defines the list
# SRCS, containing the names of the source files, and optionally HDRS, listing
# the names of the public headers.
#
# If the variable FOAM_HAS_FLEX_SOURCES evaluates to TRUE and the list of files
# contains files having a .L suffix, this macro automatically generates rules to
# compile them using flex.
#
# The option EXPORT <export-set> specifies an export-set name which is different
# from ${PROJECT_NAME}LibraryDepends. The default can be changed by setting the
# variable FOAM_EXPORT_SET_NAME. If SKIP_EXPORT_SET is specified, this library
# is not included in any export-set. The default can be changed by setting
# FOAM_ENABLE_EXPORT_SET.
#
# If you require include-wrappers, set FOAM_CREATE_INCLUDE_WRAPPERS to TRUE.
# To build all libraries as Frameworks on Mac OS X, set FOAM_BUILD_FRAMEWORKS
# to TRUE. The Framework version is initialized with FOAM_VERSION_FULL and
# the install-name directory with FOAM_FRAMEWORK_INSTALL_NAME_DIR. The first
# defaults to FALSE, the others are not set if not defined.
#
#  FOAM_ADD_EXECUTABLE(<target> [OUTPUT_NAME <name>] [APP_SECTION <id>]
#                      [DOC_SRC <src>] [SKIP_DOC_INDEX] [SKIP_MANPAGE]
#                      [<src> ...])
#
# Adds a @PROJECT_NAME@ executable with the target name <target> and the output
# name ${FOAM_EXE_PREFIX}<target>, which can be customized using the
# OUTPUT_NAME <name> argument. It is important to note that setting the
# OUTPUT_NAME target property directly results in a wrong man-page name.
# <src> ... are all source files. If none are given, the function requires that
# the file ${CMAKE_CURRENT_SOURCE_DIR}/files.cmake exists which defines the
# list SRCS, containing the names of the source files.
#
# If the variable FOAM_HAS_FLEX_SOURCES evaluates to TRUE and the list of files
# contains files having a .L suffix, this macro automatically generates rules to
# compile them using flex.
#
# APP_SECTION <id> specifies the section ID under which the brief description of
# the application is to be listed. If not specified, defaults to the setting of
# the FOAM_APP_SECTION variable, and if that is not defined, the application is
# not registered at all.
#
# DOC_SRC <src> names the file used to auto-generate the manpage. If not
# specified, this defaults to the first file in the sources list.
#
# The options SKIP_DOC_INDEX and SKIP_MANPAGE suppress the inclusion in the
# Doxygen documentation index and the creation of the manpage, respectively.
# The first option can also be set by setting the variable
# FOAM_ENABLE_DOC_INDEX to FALSE, the creation of manual pages can be disabled
# by setting FOAM_MANPAGE_FORMATS to the empty list of FALSE.
#
#  FOAM_ADD_TARGET_TO_BUILD_TREE_EXPORT(<export_set> <target> ...)
#
# Adds <target> to the build-tree export set <export_set>.
#
#  FOAM_EXPORT_TO_BUILD_TREE(<export_set> [<namespace>])
#
# Exports all targets in set <export_set> to the build tree. Optionally the a
# <namespace> can be specified which is prefixed to the exported library names.
# This defaults to _FOAM and can be overriden by FOAM_EXPORT_NAMESPACE.
#
#  FOAM_INSTALL_TARGETS(<target> ...
#    [EXPORT <export_set> | SKIP_EXPORT] [EXPORT_EXECUTABLES]
#    [[ARCHIVE|LIBRARY|RUNTIME|FRAMEWORK|PRIVATE_HEADER|PUBLIC_HEADER]
#    [DESTINATION <dir>] [COMPONENT <component>]...])
#
# Installs @PROJECT_NAME@ targets. To override the export-set (default is
# ${PROJECT_NAME}LibraryDepends) use EXPORT_SET <export_set> or define the
# variable FOAM_EXPORT_SET_NAME. If you do not want to include this target
# in the export-set, specify SKIP_EXPORT or define FOAM_ENABLE_EXPORT_SET.
# Executables are by default not exported, specify EXPORT_EXECUTABLES or set
# FOAM_EXPORT_EXECUTABLES to TRUE to change this.
#
# To override the default installation locations, use XXX DESTINATION <dir>
# and for a different install-component, use XXX COMPONENT <component>. If you
# specify both, use XXX DESTINATION <dir> COMPONENT <component>. The defaults
# are as follows:
#
#  TYPE             DEFAULT DESTINATION       OVERRIDE VARIABLE
#  ----------------------------------------------------------------------
#  ARCHIVE          lib/${PROJECT_NAME}       FOAM_INSTALL_ARCHIVE_PATH
#  LIBRARY          lib/${PROJECT_NAME}       FOAM_INSTALL_LIBRARY_PATH
#  RUNTIME          libexec/${PROJECT_NAME}   FOAM_INSTALL_RUNTIME_PATH
#  FRAMEWORK        /Library/Frameworks       FOAM_INSTALL_FRAMEWORK_PATH
#  PRIVATE_HEADER   include/${PROJECT_NAME}   FOAM_INSTALL_HEADER_PATH
#  PUBLIC_HEADER    include/${PROJECT_NAME}   FOAM_INSTALL_HEADER_PATH
#
#  TYPE             DEFAULT COMPONENT         OVERRIDE VARIABLE
#  --------------------------------------------------------------------------
#  ARCHIVE          dev                       FOAM_INSTALL_ARCHIVE_COMPONENT
#  LIBRARY          shlibs                    FOAM_INSTALL_LIBRARY_COMPONENT
#  RUNTIME          bin                       FOAM_INSTALL_RUNTIME_COMPONENT
#  FRAMEWORK        shlibs                    FOAM_INSTALL_FRAMEWORK_COMPONENT
#  PRIVATE_HEADER   dev                       FOAM_INSTALL_HEADER_COMPONENT
#  PUBLIC_HEADER    dev                       FOAM_INSTALL_HEADER_COMPONENT
#
# The default installation destinations for PRIVATE_HEADER and PUBLIC_HEADER are
# automatically appended by /<OUTPUT_NAME> (also if the override-variable is
# defined).
#
#  FOAM_CREATE_INCLUDE_WRAPPERS(<libraryName> <header1> ...)
#
# Creates in ${CMAKE_BINARY_DIR}/include an include-tree which contains
# "include-wrappers", i.e. files only containing an #include statement
# referring to the actual file in the source tree. All header files belonging
# to the library ${libraryName} are thus mapped into the include-scheme
# ${libraryName}/${headerName}. This structure makes FreeFOAM installable and
# is also useful for Mac OS X frameworks which use the same naming scheme.
# Further it makes the build much more robust as the strong dependence on the
# include-path is removed. User-code should normally not have to call this
# function.
#
#  FOAM_CHECK_AND_COMPILE_FLEX(<src_list>)
#
# Checks a list of source files for flex++ sources and compiles them. The
# function replaces the .L file in the sources list by the generated .C file.
# This file gets created in the ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES}
# directory. The output name is generated by replacing .L with .C and stripping
# all directory components from the .L file. The flex target is named using the
# NAME_WE component, suffixed with _Lexer. The function will add FLEX_CXX_FLAGS
# to the COMPILE_FLAGS of the FLEX_TARGET call.
#
# It is an error if *.L sources are discovered and FOAM_HAS_FLEX_SOURCES
# does not evaluate to TRUE. User-code should not have to call this function
# explicitly.
#
#  FOAM_LINK_LOADABLE_LIBRARY(<target>)
#
# This function creates a symbolic link to a (framework) library into the
# plugins directory such that it can be loaded using dlopen (or similar) for
# <target>.
#
#  FOAM_ADD_EXECUTABLE_TO_DOC_INDEX(<target> <doc_file>)
#
# Add an application <target> to the documentation-index file, where the
# documentation header comments are in the file <doc_file>.
#
# DO NOT call this function after you called FOAM_WRITE_DOC_INDEX(), it won't
# have any effect!
#
#  FOAM_WRITE_DOC_INDEX()
#
# Create the documentation index file. Call this function after all calls to
# FOAM_ADD_EXECUTABLE_TO_DOC_INDEX(). This will create:
#
#  ${CMAKE_BINARY_DIR}/data/DoxyDocIndex.in
#  ${CMAKE_BINARY_DIR}/data/DoxyDocIndex
#  ${CMAKE_BINARY_DIR}/InstallFiles/data/DoxyDocIndex
#
#  FOAM_CREATE_MANPAGE(<name> <src> [<dep> ...])
#
# Create a manpage <name> either from AsciiDoc source or from the documentation
# comments. This function checks whether the list FOAM_MANPAGE_FORMATS
# evaluates to TRUE, otherwise it is a no-op. If the file <src> is an AsciiDoc
# source, it's name must be of the format <base_name>.<sect>.in.txt, where
# <base_name> is an arbitrary string that must not match <name> and <sect> is
# the man-section number. If the file is not an AsciiDoc source file, the
# manual page number is always 1. The macro will then for each of the formats
# listed in FOAM_MANPAGE_FORMATS create a manual page. Currently only "manpage"
# and "xhtml" are supported, where the former is generated in
# ${CMAKE_BINARY_DIR}/doc/man/man<sect> and installed in
# ${FOAM_INSTALL_MAN_PATH}/man<sect>, the latter is generated in
# ${CMAKE_BINARY_DIR}/doc/html/man<sect> and installed to
# ${FOAM_INSTALL_DOC_PATH}/doc/html/man<sect>. The files listed in <dep> are
# additional dependencies on which <src> depends (e.g. through include macros).
#
#  FOAM_DEPENDENT_VARIABLES(<var> [<depvar> ...])
#
# Purge dependend cache-variables <depvar> when the independent variable <var>
# changes. This macro caches the value of a variable and detects changes upon
# the next run (e.g. when the user changed an option). If the value changed, the
# dependent variables are unset and removed from the cache.
#
#  FOAM_CONFIGURE_FILES(<installFilesVar>
#                       [[COPYONLY]
#                         [DESTDIR <dir>] [BASENAME] <file> ...] ...)
#
# Configure utility files for build and install tree. Configures all files into
#
#   ${CMAKE_BINARY_DIR}/<file> with build tree settings
#   ${CMAKE_BINARY_DIR}/InstallFiles/<file> with install tree settings
#
# using CONFIGURE_FILE() with @ONLY. If a .in suffix is present, it will be
# removed. The variable FOAM_STRIP_SUFFIXES may be set to a list of regular
# expresions matching suffixes (e.g. "\\.in$") to override this choice. Only
# the first suffix that is found to be present will be removed, so if you want
# to remove e.g. ".py.in" it is not enough to have "\\.in$;\\.py$", you need
# "\\.py\\.in$" BEFORE the "\\.in$" element (if you have any).
#
# The DESTDIR option can be used to define a sub-directory, such that the
# configured paths become
#
#   ${CMAKE_BINARY_DIR}/<dir>/<file>
#   ${CMAKE_BINARY_DIR}/InstallFiles/<dir>/<file>
#
# If after a DESTDIR <dir> option the BASENAME option is used, all directory
# components will be stripped from the following files (up to the next DESTDIR
# or COPYONLY) before constructing the path. Files after the COPYONLY are not
# configured and will only be copied into ${CMAKE_BINARY_DIR}/${destDir}/ (to
# save space and speed things up).
#
# The variable <installFilesVar> will contain the names of the files for the
# install-tree. This variable can be used for the INSTALL(FILES ...) command or,
# perhaps better suited, FOAM_INSTALL_CONFIGURED_FILES().
#
# In order to determine which variables to define for the configure-step, this
# function uses the variable FOAM_CONFIGURE_FILES_VARIABLES which is a list
# containing 3-tuples. The first element is the variable name, followed by the
# value for the build-tree and the last element is the value for the build-tree.
# The next element in the list starts a new triplet. The character ; must be
# escaped as \; in order to not be treated as a list-element separator. The name
# of the variable must be a valid idenitifier will be substituted in the files
# if it references as @VAR_NAME@ (@ONLY option of CONFIGURE_FILE).
#
# If you need a file to have a different output name than the source file has
# (i.e. the part of the name before the suffix), you can do so by providing a
# string of the format "<sourceName>==<destinationName>" instead of just the
# source-name. This can also be used to modify the sub-directory part. Beware,
# that suffix-stripping is still performed on the output name.
#
#  FOAM_INSTALL_CONFIGURED_FILES([FILES|PROGRAMS]
#                                <file> ...
#                                DESTINATION <dir> [COMPONENT <component>])
#
# Install files configured with FOAM_CONFIGURE_FILES(). This is similar to
# INSTALL(FILES ...) and INSTALL(PROGRAMS ...), except for the handling
# of the installation directory. For each file its relative path to
# ${CMAKE_BINARY_DIR}/InstallFiles or ${CMAKE_BINARY_DIR} is computed (it MUST
# be a child of one of these directories) and this name is then appended to the
# destination <dir>. This simplifies installing files that should end up in
# different sub-directories of the destination directory <dir>.
#
#  FOAM_PARSE_ARGUMENTS(<prefix> <arg_names> <option_names> [<arg1> ...])
#
# This is a helper function to parse optional arguments in macros/functions It
# has been adapted from the public CMake wiki
# (http://www.cmake.org/Wiki/CMakeMacroParseArguments). For each argument
# <opt_name> in <arg1> ... the function checks whether an entry with the same
# name in <option_names> exists. If so, it sets the variable
# <prefix>_<opt_name> to TRUE, otherwise to FALSE. For all items <arg_name> in
# the argument list that corresponds to a <arg_spec> entry in <arg_specs>, the
# variable <prefix>_<arg_name> will be filled by the list of all following
# arguments up to the next <arg_name> or the end of all arguments. All options
# will be removed from these lists. The special variable <prefix>_DEFAULT_ARGS
# will contain all arguments occuring before the first argument in <arg_names>.
# <arg_spec> takes to form <arg_name>[:<n_args>], where <n_args> specifies the
# exact number of arguments that must follow <arg_name> in the argument list.
# If :<n_args> is left ommited, an arbitrary number of arguments are accepted
# (i.e. greedy mode). Arguments not consumed (i.e. after the last accepted
# argument and before the next <arg_name> or the end of the argument list) are
# added to <prefix>_DEFAULT_ARGS.
#
#  FOAM_COMPILE_ASY(<outvar> <formats> <file> ...)
#
# Compiles the Aymptote sources into images. <outvar> will hold the names of
# the produced files. <formats> is a list of graphics formats supported by asy
# (such as pdf, eps, png, etc.). <file> is one or more Asymptote source files.
#
#  FOAM_FIX_APPLE_GCC_BUG()
#
# This is an internal function used to work around in the g++-4.2 compiler that
# comes with Xcode. Do not call it directly.
#

#-------------------------------------------------------------------------------
#               ______                _     ____          __  __
#              |  ____|             _| |_  / __ \   /\   |  \/  |
#              | |__ _ __ ___  ___ /     \| |  | | /  \  | \  / |
#              |  __| '__/ _ \/ _ ( (| |) ) |  | |/ /\ \ | |\/| |
#              | |  | | |  __/  __/\_   _/| |__| / ____ \| |  | |
#              |_|  |_|  \___|\___|  |_|   \____/_/    \_\_|  |_|
#
#                   FreeFOAM: The Cross-Platform CFD Toolkit
#
# Copyright (C) 2008-2010 Michael Wild <themiwi@users.sf.net>
#                         Gerber van der Graaf <gerber_graaf@users.sf.net>
#-------------------------------------------------------------------------------
# License
#   This file is part of FreeFOAM.
#
#   FreeFOAM is free software; you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation; either version 2 of the License, or (at your
#   option) any later version.
#
#   FreeFOAM is distributed in the hope that it will be useful, but WITHOUT
#   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
#   for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with FreeFOAM; if not, write to the Free Software Foundation,
#   Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#-------------------------------------------------------------------------------

# helper function to set a variable to a default value if it is not defined
function(_use_foam_set_default var defval)
  if(NOT DEFINED ${var})
    set(${var} "${defval}" PARENT_SCOPE)
  endif()
endfunction()

# include macros
_use_foam_set_default(FOAM_ENABLE_EXPORT FALSE)
_use_foam_set_default(FOAM_EXPORT_EXECUTABLES FALSE)
_use_foam_set_default(FOAM_BUILD_FRAMEWORKS FALSE)
_use_foam_set_default(FOAM_ENABLE_DOC_INDEX FALSE)
_use_foam_set_default(FOAM_ENABLE_MANPAGES FALSE)
_use_foam_set_default(FOAM_EXE_PREFIX "@FOAM_EXE_PREFIX@")
include(${FOAM_UTILITIES_FILE})

foam_fix_apple_gcc_bug()

# set up header search path
if(APPLE AND FOAM_WITH_FRAMEWORKS)
  add_definitions("-F${FOAM_FRAMEWORK_DIR}")
else()
  include_directories(${FOAM_INCLUDE_DIRS})
endif()

# set up library search path
link_directories(${FOAM_LIBRARY_DIRS})

# defines
add_definitions(${FOAM_DEFINITIONS})

# build shared libraries
set(BUILD_SHARED_LIBS SHARED)

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