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c53b5cd221
CMake/Modules/FindPkgConfig.cmake
Christoph Grüninger c53b5cd221 FindPkgConfig: Prefer PKG_CONFIG to find pkg-config (#13175) 
If the environment variable PKG_CONFIG is set, use this as the
default pkg-config executable.
2014-02-27 10:29:01 -05:00

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CMake
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#.rst:
# FindPkgConfig
# -------------
#
# a pkg-config module for CMake
#
#
#
# To find the pkg-config executable, it uses the variable
# PKG_CONFIG_EXECUTABLE or the environment variable PKG_CONFIG first.
#
#
#
# Usage:
#
# ::
#
# pkg_check_modules(<PREFIX> [REQUIRED] [QUIET] <MODULE> [<MODULE>]*)
# checks for all the given modules
#
#
#
# ::
#
# pkg_search_module(<PREFIX> [REQUIRED] [QUIET] <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
#
# When the 'QUIET' argument is set, no status messages will be printed.
#
# It sets the following variables:
#
# ::
#
# PKG_CONFIG_FOUND ... if pkg-config executable was found
# PKG_CONFIG_EXECUTABLE ... pathname of the pkg-config program
# PKG_CONFIG_VERSION_STRING ... the version of the pkg-config program found
# (since CMake 2.8.8)
#
#
#
# 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>_FOUND ... set to 1 if module(s) exist
# <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 2006-2014 Kitware, Inc.
# Copyright 2014 Christoph Grüninger <foss@grueninger.de>
# 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 distribute this file outside of CMake, substitute the full
# License text for the above reference.)
### Common stuff ####
set(PKG_CONFIG_VERSION 1)
# find pkg-config, use PKG_CONFIG if set
if((NOT PKG_CONFIG_EXECUTABLE) AND (NOT "$ENV{PKG_CONFIG}" STREQUAL ""))
set(PKG_CONFIG_EXECUTABLE "$ENV{PKG_CONFIG}" CACHE FILEPATH "pkg-config executable")
endif()
find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
mark_as_advanced(PKG_CONFIG_EXECUTABLE)
if (PKG_CONFIG_EXECUTABLE)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --version
OUTPUT_VARIABLE PKG_CONFIG_VERSION_STRING
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif ()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(PkgConfig
REQUIRED_VARS PKG_CONFIG_EXECUTABLE
VERSION_VAR PKG_CONFIG_VERSION_STRING)
# This is needed because the module name is "PkgConfig" but the name of
# this variable has always been PKG_CONFIG_FOUND so this isn't automatically
# handled by FPHSA.
set(PKG_CONFIG_FOUND "${PKGCONFIG_FOUND}")
# Unsets the given variables
macro(_pkgconfig_unset var)
set(${var} "" CACHE INTERNAL "")
endmacro()
macro(_pkgconfig_set var value)
set(${var} ${value} CACHE INTERNAL "")
endmacro()
# 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()
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()
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()
endmacro()
# 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 ${ARGN})
endmacro()
# Splits given arguments into options and a package list
macro(_pkgconfig_parse_options _result _is_req _is_silent)
set(${_is_req} 0)
set(${_is_silent} 0)
foreach(_pkg ${ARGN})
if (_pkg STREQUAL "REQUIRED")
set(${_is_req} 1)
endif ()
if (_pkg STREQUAL "QUIET")
set(${_is_silent} 1)
endif ()
endforeach()
set(${_result} ${ARGN})
list(REMOVE_ITEM ${_result} "REQUIRED")
list(REMOVE_ITEM ${_result} "QUIET")
endmacro()
###
macro(_pkg_check_modules_internal _is_required _is_silent _prefix)
_pkgconfig_unset(${_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()
message(STATUS "checking for modules '${_pkg_check_modules_list}'")
endif()
endif()
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()
set(_pkg_check_modules_pkg_name "${_pkg_check_modules_pkg}")
set(_pkg_check_modules_pkg_op)
set(_pkg_check_modules_pkg_ver)
endif()
# handle the operands
if (_pkg_check_modules_pkg_op STREQUAL ">=")
list(APPEND _pkg_check_modules_exist_query --atleast-version)
endif()
if (_pkg_check_modules_pkg_op STREQUAL "=")
list(APPEND _pkg_check_modules_exist_query --exact-version)
endif()
if (_pkg_check_modules_pkg_op STREQUAL "<=")
list(APPEND _pkg_check_modules_exist_query --max-version)
endif()
# create the final query which is of the format:
# * --atleast-version <version> <pkg-name>
# * --exact-version <version> <pkg-name>
# * --max-version <version> <pkg-name>
# * --exists <pkg-name>
if (_pkg_check_modules_pkg_op)
list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_ver}")
else()
list(APPEND _pkg_check_modules_exist_query --exists)
endif()
_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()
set(_pkg_check_modules_failed 1)
endif()
endforeach()
if(_pkg_check_modules_failed)
# fail when requested
if (${_is_required})
message(SEND_ERROR "A required package was not found")
endif ()
else()
# when we are here, we checked whether requested modules
# exist. Now, go through them and set variables
_pkgconfig_set(${_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()
set(_pkg_check_prefix "${_prefix}_${_pkg_check_modules_pkg}")
endif()
_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 )
if (NOT ${_is_silent})
message(STATUS " found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
endif ()
endforeach()
# set variables which are combined for multiple modules
_pkgconfig_invoke_dyn("${_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}" "${_prefix}" CFLAGS_OTHER "" --cflags-only-other )
endif()
else()
if (${_is_required})
message(SEND_ERROR "pkg-config tool not found")
endif ()
endif()
endmacro()
###
### 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 ${_prefix}_FOUND)
_pkgconfig_parse_options (_pkg_modules _pkg_is_required _pkg_is_silent "${_module0}" ${ARGN})
_pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" "${_prefix}" ${_pkg_modules})
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif()
endmacro()
###
macro(pkg_search_module _prefix _module0)
# check cached value
if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
set(_pkg_modules_found 0)
_pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent "${_module0}" ${ARGN})
if (NOT ${_pkg_is_silent})
message(STATUS "checking for one of the modules '${_pkg_modules_alt}'")
endif ()
# 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}" "${_pkg_alt}")
endif()
if (${_prefix}_FOUND)
set(_pkg_modules_found 1)
endif()
endforeach()
if (NOT ${_prefix}_FOUND)
if(${_pkg_is_required})
message(SEND_ERROR "None of the required '${_pkg_modules_alt}' found")
endif()
endif()
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif()
endmacro()
### Local Variables:
### mode: cmake
### End:
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