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CMake/Modules/FindPkgConfig.cmake
Brad King 940733997a Remove old license from FindPkgConfig.cmake module 
This module was contributed under a BSD-like license.  We added CMake's
OSI-approved BSD License on top of it.  With the author's permission,
this commit removes the old license text and puts the author's copyright
notice in the block referring to the new license.
2009-10-05 09:13:29 -04:00

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CMake
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# - a pkg-config module for CMake
#
# Usage:
# pkg_check_modules(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
# checks for all the given modules
#
# pkg_search_module(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
# checks for given modules and uses the first working one
#
# When the 'REQUIRED' argument was set, macros will fail with an error
# when module(s) could not be found
#
# It sets the following variables:
# PKG_CONFIG_FOUND ... true if pkg-config works on the system
# PKG_CONFIG_EXECUTABLE ... pathname of the pkg-config program
# <PREFIX>_FOUND ... set to 1 if module(s) exist
#
# For the following variables two sets of values exist; first one is the
# common one and has the given PREFIX. The second set contains flags
# which are given out when pkgconfig was called with the '--static'
# option.
# <XPREFIX>_LIBRARIES ... only the libraries (w/o the '-l')
# <XPREFIX>_LIBRARY_DIRS ... the paths of the libraries (w/o the '-L')
# <XPREFIX>_LDFLAGS ... all required linker flags
# <XPREFIX>_LDFLAGS_OTHER ... all other linker flags
# <XPREFIX>_INCLUDE_DIRS ... the '-I' preprocessor flags (w/o the '-I')
# <XPREFIX>_CFLAGS ... all required cflags
# <XPREFIX>_CFLAGS_OTHER ... the other compiler flags
#
# <XPREFIX> = <PREFIX> for common case
# <XPREFIX> = <PREFIX>_STATIC for static linking
#
# There are some special variables whose prefix depends on the count
# of given modules. When there is only one module, <PREFIX> stays
# unchanged. When there are multiple modules, the prefix will be
# changed to <PREFIX>_<MODNAME>:
# <XPREFIX>_VERSION ... version of the module
# <XPREFIX>_PREFIX ... prefix-directory of the module
# <XPREFIX>_INCLUDEDIR ... include-dir of the module
# <XPREFIX>_LIBDIR ... lib-dir of the module
#
# <XPREFIX> = <PREFIX> when |MODULES| == 1, else
# <XPREFIX> = <PREFIX>_<MODNAME>
#
# A <MODULE> parameter can have the following formats:
# {MODNAME} ... matches any version
# {MODNAME}>={VERSION} ... at least version <VERSION> is required
# {MODNAME}={VERSION} ... exactly version <VERSION> is required
# {MODNAME}<={VERSION} ... modules must not be newer than <VERSION>
#
# Examples
# pkg_check_modules (GLIB2 glib-2.0)
#
# pkg_check_modules (GLIB2 glib-2.0>=2.10)
# requires at least version 2.10 of glib2 and defines e.g.
# GLIB2_VERSION=2.10.3
#
# pkg_check_modules (FOO glib-2.0>=2.10 gtk+-2.0)
# requires both glib2 and gtk2, and defines e.g.
# FOO_glib-2.0_VERSION=2.10.3
# FOO_gtk+-2.0_VERSION=2.8.20
#
# pkg_check_modules (XRENDER REQUIRED xrender)
# defines e.g.:
# XRENDER_LIBRARIES=Xrender;X11
# XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
#
# pkg_search_module (BAR libxml-2.0 libxml2 libxml>=2)
#=============================================================================
# Copyright 2006-2009 Kitware, Inc.
# Copyright 2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distributed this file outside of CMake, substitute the full
# License text for the above reference.)
### Common stuff ####
set(PKG_CONFIG_VERSION 1)
set(PKG_CONFIG_FOUND 0)
find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
mark_as_advanced(PKG_CONFIG_EXECUTABLE)
if(PKG_CONFIG_EXECUTABLE)
set(PKG_CONFIG_FOUND 1)
endif(PKG_CONFIG_EXECUTABLE)
# Unsets the given variables
macro(_pkgconfig_unset var)
set(${var} "" CACHE INTERNAL "")
endmacro(_pkgconfig_unset)
macro(_pkgconfig_set var value)
set(${var} ${value} CACHE INTERNAL "")
endmacro(_pkgconfig_set)
# Invokes pkgconfig, cleans up the result and sets variables
macro(_pkgconfig_invoke _pkglist _prefix _varname _regexp)
set(_pkgconfig_invoke_result)
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} ${ARGN} ${_pkglist}
OUTPUT_VARIABLE _pkgconfig_invoke_result
RESULT_VARIABLE _pkgconfig_failed)
if (_pkgconfig_failed)
set(_pkgconfig_${_varname} "")
_pkgconfig_unset(${_prefix}_${_varname})
else(_pkgconfig_failed)
string(REGEX REPLACE "[\r\n]" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
string(REGEX REPLACE " +$" "" _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
if (NOT ${_regexp} STREQUAL "")
string(REGEX REPLACE "${_regexp}" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
endif(NOT ${_regexp} STREQUAL "")
separate_arguments(_pkgconfig_invoke_result)
#message(STATUS " ${_varname} ... ${_pkgconfig_invoke_result}")
set(_pkgconfig_${_varname} ${_pkgconfig_invoke_result})
_pkgconfig_set(${_prefix}_${_varname} "${_pkgconfig_invoke_result}")
endif(_pkgconfig_failed)
endmacro(_pkgconfig_invoke)
# Invokes pkgconfig two times; once without '--static' and once with
# '--static'
macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
_pkgconfig_invoke("${_pkglist}" ${_prefix} ${_varname} "${cleanup_regexp}" ${ARGN})
_pkgconfig_invoke("${_pkglist}" ${_prefix} STATIC_${_varname} "${cleanup_regexp}" --static ${ARGN})
endmacro(_pkgconfig_invoke_dyn)
# Splits given arguments into options and a package list
macro(_pkgconfig_parse_options _result _is_req)
set(${_is_req} 0)
foreach(_pkg ${ARGN})
if (_pkg STREQUAL "REQUIRED")
set(${_is_req} 1)
endif (_pkg STREQUAL "REQUIRED")
endforeach(_pkg ${ARGN})
set(${_result} ${ARGN})
list(REMOVE_ITEM ${_result} "REQUIRED")
endmacro(_pkgconfig_parse_options)
###
macro(_pkg_check_modules_internal _is_required _is_silent _prefix)
_pkgconfig_unset(${_prefix}_FOUND)
_pkgconfig_unset(${_prefix}_VERSION)
_pkgconfig_unset(${_prefix}_PREFIX)
_pkgconfig_unset(${_prefix}_INCLUDEDIR)
_pkgconfig_unset(${_prefix}_LIBDIR)
_pkgconfig_unset(${_prefix}_LIBS)
_pkgconfig_unset(${_prefix}_LIBS_L)
_pkgconfig_unset(${_prefix}_LIBS_PATHS)
_pkgconfig_unset(${_prefix}_LIBS_OTHER)
_pkgconfig_unset(${_prefix}_CFLAGS)
_pkgconfig_unset(${_prefix}_CFLAGS_I)
_pkgconfig_unset(${_prefix}_CFLAGS_OTHER)
_pkgconfig_unset(${_prefix}_STATIC_LIBDIR)
_pkgconfig_unset(${_prefix}_STATIC_LIBS)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_L)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_PATHS)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_OTHER)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS_I)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS_OTHER)
# create a better addressable variable of the modules and calculate its size
set(_pkg_check_modules_list ${ARGN})
list(LENGTH _pkg_check_modules_list _pkg_check_modules_cnt)
if(PKG_CONFIG_EXECUTABLE)
# give out status message telling checked module
if (NOT ${_is_silent})
if (_pkg_check_modules_cnt EQUAL 1)
message(STATUS "checking for module '${_pkg_check_modules_list}'")
else(_pkg_check_modules_cnt EQUAL 1)
message(STATUS "checking for modules '${_pkg_check_modules_list}'")
endif(_pkg_check_modules_cnt EQUAL 1)
endif(NOT ${_is_silent})
set(_pkg_check_modules_packages)
set(_pkg_check_modules_failed)
# iterate through module list and check whether they exist and match the required version
foreach (_pkg_check_modules_pkg ${_pkg_check_modules_list})
set(_pkg_check_modules_exist_query)
# check whether version is given
if (_pkg_check_modules_pkg MATCHES ".*(>=|=|<=).*")
string(REGEX REPLACE "(.*[^><])(>=|=|<=)(.*)" "\\1" _pkg_check_modules_pkg_name "${_pkg_check_modules_pkg}")
string(REGEX REPLACE "(.*[^><])(>=|=|<=)(.*)" "\\2" _pkg_check_modules_pkg_op "${_pkg_check_modules_pkg}")
string(REGEX REPLACE "(.*[^><])(>=|=|<=)(.*)" "\\3" _pkg_check_modules_pkg_ver "${_pkg_check_modules_pkg}")
else(_pkg_check_modules_pkg MATCHES ".*(>=|=|<=).*")
set(_pkg_check_modules_pkg_name "${_pkg_check_modules_pkg}")
set(_pkg_check_modules_pkg_op)
set(_pkg_check_modules_pkg_ver)
endif(_pkg_check_modules_pkg MATCHES ".*(>=|=|<=).*")
# handle the operands
if (_pkg_check_modules_pkg_op STREQUAL ">=")
list(APPEND _pkg_check_modules_exist_query --atleast-version)
endif(_pkg_check_modules_pkg_op STREQUAL ">=")
if (_pkg_check_modules_pkg_op STREQUAL "=")
list(APPEND _pkg_check_modules_exist_query --exact-version)
endif(_pkg_check_modules_pkg_op STREQUAL "=")
if (_pkg_check_modules_pkg_op STREQUAL "<=")
list(APPEND _pkg_check_modules_exist_query --max-version)
endif(_pkg_check_modules_pkg_op STREQUAL "<=")
# create the final query which is of the format:
# * --atleast-version <version> <pkg-name>
# * --exact-version <version> <pkg-name>
# * --max-version <version> <pkg-name>
# * --exists <pkg-name>
if (_pkg_check_modules_pkg_op)
list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_ver}")
else(_pkg_check_modules_pkg_op)
list(APPEND _pkg_check_modules_exist_query --exists)
endif(_pkg_check_modules_pkg_op)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_VERSION)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_PREFIX)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_INCLUDEDIR)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_LIBDIR)
list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_name}")
list(APPEND _pkg_check_modules_packages "${_pkg_check_modules_pkg_name}")
# execute the query
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} ${_pkg_check_modules_exist_query}
RESULT_VARIABLE _pkgconfig_retval)
# evaluate result and tell failures
if (_pkgconfig_retval)
if(NOT ${_is_silent})
message(STATUS " package '${_pkg_check_modules_pkg}' not found")
endif(NOT ${_is_silent})
set(_pkg_check_modules_failed 1)
endif(_pkgconfig_retval)
endforeach(_pkg_check_modules_pkg)
if(_pkg_check_modules_failed)
# fail when requested
if (${_is_required})
message(SEND_ERROR "A required package was not found")
endif (${_is_required})
else(_pkg_check_modules_failed)
# when we are here, we checked whether requested modules
# exist. Now, go through them and set variables
_pkgconfig_set(${_prefix}_FOUND 1)
list(LENGTH _pkg_check_modules_packages pkg_count)
# iterate through all modules again and set individual variables
foreach (_pkg_check_modules_pkg ${_pkg_check_modules_packages})
# handle case when there is only one package required
if (pkg_count EQUAL 1)
set(_pkg_check_prefix "${_prefix}")
else(pkg_count EQUAL 1)
set(_pkg_check_prefix "${_prefix}_${_pkg_check_modules_pkg}")
endif(pkg_count EQUAL 1)
_pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" VERSION "" --modversion )
_pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" PREFIX "" --variable=prefix )
_pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" INCLUDEDIR "" --variable=includedir )
_pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" LIBDIR "" --variable=libdir )
message(STATUS " found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
endforeach(_pkg_check_modules_pkg)
# set variables which are combined for multiple modules
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARIES "(^| )-l" --libs-only-l )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARY_DIRS "(^| )-L" --libs-only-L )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS "" --libs )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS_OTHER "" --libs-only-other )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" INCLUDE_DIRS "(^| )-I" --cflags-only-I )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS "" --cflags )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS_OTHER "" --cflags-only-other )
endif(_pkg_check_modules_failed)
else(PKG_CONFIG_EXECUTABLE)
if (${_is_required})
message(SEND_ERROR "pkg-config tool not found")
endif (${_is_required})
endif(PKG_CONFIG_EXECUTABLE)
endmacro(_pkg_check_modules_internal)
###
### User visible macros start here
###
###
macro(pkg_check_modules _prefix _module0)
# check cached value
if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
_pkgconfig_parse_options (_pkg_modules _pkg_is_required "${_module0}" ${ARGN})
_pkg_check_modules_internal("${_pkg_is_required}" 0 "${_prefix}" ${_pkg_modules})
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif(NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
endmacro(pkg_check_modules)
###
macro(pkg_search_module _prefix _module0)
# check cached value
if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
set(_pkg_modules_found 0)
_pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required "${_module0}" ${ARGN})
message(STATUS "checking for one of the modules '${_pkg_modules_alt}'")
# iterate through all modules and stop at the first working one.
foreach(_pkg_alt ${_pkg_modules_alt})
if(NOT _pkg_modules_found)
_pkg_check_modules_internal(0 1 "${_prefix}" "${_pkg_alt}")
endif(NOT _pkg_modules_found)
if (${_prefix}_FOUND)
set(_pkg_modules_found 1)
endif(${_prefix}_FOUND)
endforeach(_pkg_alt)
if (NOT ${_prefix}_FOUND)
if(${_pkg_is_required})
message(SEND_ERROR "None of the required '${_pkg_modules_alt}' found")
endif(${_pkg_is_required})
endif(NOT ${_prefix}_FOUND)
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif(NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
endmacro(pkg_search_module)
### Local Variables:
### mode: cmake
### End:
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