Merge topic 'findpkgconfig-target'
df97b979 FindPkgConfig: optionally create imported target for the found librariesThis commit is contained in:
Brad King
CMake Topic Stage
commit
856804f9a9
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@ -0,0 +1,5 @@
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FindPkgConfig-targets
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---------------------
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* The :module:`FindPkgConfig` module learned to optionally create imported
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targets for the libraries it has found.
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@ -16,6 +16,7 @@
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# Copyright 2006-2014 Kitware, Inc.
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# Copyright 2014 Christoph Grüninger <foss@grueninger.de>
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# Copyright 2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
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# Copyright 2016 Rolf Eike Beer <eike@sf-mail.de>
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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@ -119,11 +120,12 @@ macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
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endmacro()
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# Splits given arguments into options and a package list
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macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cmake_environment_path)
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macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cmake_environment_path _imp_target)
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set(${_is_req} 0)
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set(${_is_silent} 0)
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set(${_no_cmake_path} 0)
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set(${_no_cmake_environment_path} 0)
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set(${_imp_target} 0)
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if(DEFINED PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
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if(NOT PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
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set(${_no_cmake_path} 1)
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@ -147,6 +149,9 @@ macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cma
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if (_pkg STREQUAL "NO_CMAKE_ENVIRONMENT_PATH")
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set(${_no_cmake_environment_path} 1)
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endif()
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if (_pkg STREQUAL "IMPORTED_TARGET")
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set(${_imp_target} 1)
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endif()
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endforeach()
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set(${_result} ${ARGN})
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@ -154,6 +159,7 @@ macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cma
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list(REMOVE_ITEM ${_result} "QUIET")
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list(REMOVE_ITEM ${_result} "NO_CMAKE_PATH")
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list(REMOVE_ITEM ${_result} "NO_CMAKE_ENVIRONMENT_PATH")
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list(REMOVE_ITEM ${_result} "IMPORTED_TARGET")
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endmacro()
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# Add the content of a variable or an environment variable to a list of
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@ -181,8 +187,63 @@ function(_pkgconfig_add_extra_path _extra_paths_var _var)
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set(${_extra_paths_var} ${${_extra_paths_var}} PARENT_SCOPE)
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endfunction()
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# scan the LDFLAGS returned by pkg-config for library directories and
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# libraries, figure out the absolute paths of that libraries in the
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# given directories, and create an imported target from them
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function(_pkg_create_imp_target _prefix _no_cmake_path _no_cmake_environment_path)
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unset(_libs)
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unset(_find_opts)
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# set the options that are used as long as the .pc file does not provide a library
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# path to look into
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if(_no_cmake_path)
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set(_find_opts "NO_CMAKE_PATH")
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endif()
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if(_no_cmake_environment_path)
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set(_find_opts "${_find_opts} NO_CMAKE_ENVIRONMENT_PATH")
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endif()
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foreach (flag IN LISTS ${_prefix}_LDFLAGS)
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if (flag MATCHES "^-L(.*)")
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# only look into the given paths from now on
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set(_find_opts "HINTS ${${CMAKE_MATCH_1}} NO_DEFAULT_PATH")
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continue()
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endif()
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if (flag MATCHES "^-l(.*)")
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set(_pkg_search "${CMAKE_MATCH_1}")
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else()
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continue()
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endif()
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find_library(pkgcfg_lib_${_prefix}_${_pkg_search}
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NAMES ${_pkg_search}
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${_find_opts})
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list(APPEND _libs "${pkgcfg_lib_${_prefix}_${_pkg_search}}")
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endforeach()
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# only create the target if it is linkable, i.e. no executables
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if (NOT TARGET PkgConfig::${_prefix}
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AND ( ${_prefix}_INCLUDE_DIRS OR _libs OR ${_prefix}_CFLAGS_OTHER ))
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add_library(PkgConfig::${_prefix} INTERFACE IMPORTED)
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unset(_props)
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if(${_prefix}_INCLUDE_DIRS)
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set_property(TARGET PkgConfig::${_prefix} PROPERTY
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INTERFACE_INCLUDE_DIRECTORIES "${${_prefix}_INCLUDE_DIRS}")
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endif()
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if(_libs)
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set_property(TARGET PkgConfig::${_prefix} PROPERTY
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INTERFACE_LINK_LIBRARIES "${_libs}")
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endif()
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if(${_prefix}_CFLAGS_OTHER)
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set_property(TARGET PkgConfig::${_prefix} PROPERTY
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INTERFACE_COMPILE_OPTIONS "${${_prefix}_CFLAGS_OTHER}")
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endif()
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endif()
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endfunction()
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###
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macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cmake_environment_path _prefix)
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macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cmake_environment_path _imp_target _prefix)
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_pkgconfig_unset(${_prefix}_FOUND)
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_pkgconfig_unset(${_prefix}_VERSION)
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_pkgconfig_unset(${_prefix}_PREFIX)
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@ -400,6 +461,10 @@ macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cma
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_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" INCLUDE_DIRS "(^| )-I" --cflags-only-I )
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_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS "" --cflags )
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_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS_OTHER "" --cflags-only-other )
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if (_imp_target)
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_pkg_create_imp_target("${_prefix}" _no_cmake_path _no_cmake_environment_path)
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endif()
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endif()
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if(NOT "${_extra_paths}" STREQUAL "")
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@ -427,6 +492,7 @@ endmacro()
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pkg_check_modules(<PREFIX> [REQUIRED] [QUIET]
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[NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
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[IMPORTED_TARGET]
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<MODULE> [<MODULE>]*)
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@ -443,6 +509,9 @@ endmacro()
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The ``NO_CMAKE_PATH`` and ``NO_CMAKE_ENVIRONMENT_PATH`` arguments
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disable this behavior for the cache variables and the environment
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variables, respectively.
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The ``IMPORTED_TARGET`` argument will create an imported target named
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PkgConfig::<PREFIX>> that can be passed directly as an argument to
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:command:`target_link_libraries`.
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It sets the following variables: ::
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@ -524,8 +593,8 @@ endmacro()
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macro(pkg_check_modules _prefix _module0)
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# check cached value
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if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
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_pkgconfig_parse_options (_pkg_modules _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path "${_module0}" ${ARGN})
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_pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" ${_no_cmake_path} ${_no_cmake_environment_path} "${_prefix}" ${_pkg_modules})
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_pkgconfig_parse_options (_pkg_modules _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target "${_module0}" ${ARGN})
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_pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} "${_prefix}" ${_pkg_modules})
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_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
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endif()
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@ -540,6 +609,7 @@ endmacro()
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pkg_search_module(<PREFIX> [REQUIRED] [QUIET]
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[NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
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[IMPORTED_TARGET]
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<MODULE> [<MODULE>]*)
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Examples
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@ -552,7 +622,7 @@ macro(pkg_search_module _prefix _module0)
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# check cached value
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if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
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set(_pkg_modules_found 0)
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_pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path "${_module0}" ${ARGN})
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_pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target "${_module0}" ${ARGN})
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if (NOT ${_pkg_is_silent})
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message(STATUS "Checking for one of the modules '${_pkg_modules_alt}'")
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@ -561,7 +631,7 @@ macro(pkg_search_module _prefix _module0)
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# iterate through all modules and stop at the first working one.
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foreach(_pkg_alt ${_pkg_modules_alt})
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if(NOT _pkg_modules_found)
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_pkg_check_modules_internal(0 1 ${_no_cmake_path} ${_no_cmake_environment_path} "${_prefix}" "${_pkg_alt}")
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_pkg_check_modules_internal(0 1 ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} "${_prefix}" "${_pkg_alt}")
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endif()
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if (${_prefix}_FOUND)
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@ -0,0 +1,26 @@
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cmake_minimum_required(VERSION 3.5)
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project(FindPkgConfig_IMPORTED_TARGET C)
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find_package(PkgConfig REQUIRED)
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pkg_check_modules(NCURSES IMPORTED_TARGET QUIET ncurses)
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if (NCURSES_FOUND)
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set(tgt PkgConfig::NCURSES)
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if (NOT TARGET ${tgt})
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message(FATAL_ERROR "FindPkgConfig found ncurses, but did not create an imported target for it")
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endif ()
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set(prop_found FALSE)
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foreach (prop IN ITEMS INTERFACE_INCLUDE_DIRECTORIES INTERFACE_LINK_LIBRARIES INTERFACE_COMPILE_OPTIONS)
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get_target_property(value ${tgt} ${prop})
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if (value)
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message(STATUS "Found property ${prop} on target: ${value}")
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set(prop_found TRUE)
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endif ()
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endforeach ()
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if (NOT prop_found)
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message(FATAL_ERROR "target ${tgt} found, but it has no properties")
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endif ()
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else ()
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message(STATUS "skipping test; ncurses not found")
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endif ()
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@ -15,4 +15,5 @@ find_package(PkgConfig)
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if (PKG_CONFIG_FOUND)
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run_cmake(FindPkgConfig_GET_VARIABLE)
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run_cmake(FindPkgConfig_cache_variables)
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run_cmake(FindPkgConfig_IMPORTED_TARGET)
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endif ()
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