Add pkg-config file

cmake/modules/BasicConfig.cmake

@@ -39,6 +39,7 @@ set(TARGET_EXECUTABLE "${CMAKE_INSTALL_PREFIX}/bin/${TARGET_PREFIX}${META_PROJEC
 option(FORCE_OLD_ABI "specifies whether usage of old ABI should be forced" OFF)
 if(FORCE_OLD_ABI)
     add_definitions(-D_GLIBCXX_USE_CXX11_ABI=0)
+    set(META_REQUIRED_CFLAGS "${META_REQUIRED_CFLAGS} -D-D_GLIBCXX_USE_CXX11_ABI=0")
     message(STATUS "Forcing usage of old CXX11 ABI.")
 else()
     message(STATUS "Using default CXX11 ABI (not forcing old CX11 ABI).")
@@ -60,3 +61,23 @@ endif()
 # options for forcing static linkage when building applications or dynamic libraries
 option(STATIC_LINKAGE "forces static linkage when building applications" OFF)
 option(STATIC_LIBRARY_LINKAGE "forces static linkage when building dynamic libraries" OFF)
+
+# options for enabling/disabling Qt GUI (if available)
+if(WIDGETS_HEADER_FILES OR WIDGETS_SRC_FILES OR WIDGETS_UI_FILES)
+    if(META_GUI_OPTIONAL)
+        option(WIDGETS_GUI "enables/disables building the Qt Widgets GUI: yes (default) or no" ON)
+    else()
+        set(WIDGETS_GUI ON)
+    endif()
+else()
+    set(WIDGETS_GUI OFF)
+endif()
+if(QML_HEADER_FILES OR QML_SRC_FILES)
+    if(META_GUI_OPTIONAL)
+        option(QUICK_GUI "enables/disables building the Qt Quick GUI: yes (default) or no" ON)
+    else()
+        set(QUICK_GUI ON)
+    endif()
+else()
+    set(QUICK_GUI OFF)
+endif()

cmake/modules/LibraryTarget.cmake

@@ -12,9 +12,9 @@ set(LIB_SUFFIX "" CACHE STRING "specifies the general suffix for the library dir
 set(SELECTED_LIB_SUFFIX "${LIB_SUFFIX}")
 set(LIB_SUFFIX_32 "" CACHE STRING "specifies the suffix for the library directory to be used when building 32-bit library")
 set(LIB_SUFFIX_64 "" CACHE STRING "specifies the suffix for the library directory to be used when building 64-bit library")
-if(CMAKE_SIZEOF_VOID_P MATCHES "8" AND NOT ${LIB_SUFFIX_64} STREQUAL "")
+if(LIB_SUFFIX_64 AND CMAKE_SIZEOF_VOID_P MATCHES "8")
     set(SELECTED_LIB_SUFFIX "${LIB_SUFFIX_64}")
-elseif(CMAKE_SIZEOF_VOID_P MATCHES "4" AND NOT ${LIB_SUFFIX_32} STREQUAL "")
+elseif(LIB_SUFFIX_32 AND CMAKE_SIZEOF_VOID_P MATCHES "4")
     set(SELECTED_LIB_SUFFIX "${LIB_SUFFIX_32}")
 endif()
 
@@ -63,10 +63,10 @@ if(BUILD_STATIC_LIBS)
         OUTPUT_NAME ${TARGET_PREFIX}${META_PROJECT_NAME}${TARGET_SUFFIX}
         CXX_STANDARD 11
     )
-    set(META_LIB_DEPENDS ${${TARGET_PREFIX}${META_PROJECT_NAME}${TARGET_SUFFIX}_static_LIB_DEPENDS}) # used in config file
+    set(META_STATIC_LIB_DEPENDS ${${TARGET_PREFIX}${META_PROJECT_NAME}${TARGET_SUFFIX}_static_LIB_DEPENDS}) # used in config file
 endif()
 
-# create the CMake config file from the template
+# create the CMake package config file from template
 configure_package_config_file(
     "${CONFIG_TEMPLATE_FILE}"
     "${CMAKE_CURRENT_BINARY_DIR}/${META_PROJECT_NAME}Config.cmake"
@@ -87,13 +87,23 @@ write_basic_package_version_file(
     COMPATIBILITY SameMajorVersion
 )
 
+# create pkg-config file from template
+# will (currently) not contain Libs.private if static libs haven't been built anyways
+include(TemplateFinder)
+find_template_file("template.pc" CPP_UTILITIES PKGCONFIG_TEMPLATE_FILE)
+configure_file(
+    "${PKGCONFIG_TEMPLATE_FILE}"
+    "${CMAKE_CURRENT_BINARY_DIR}/${META_PROJECT_NAME}.pc"
+    @ONLY
+)
+
 # add install target for the CMake config files
 install(
     FILES
         "${CMAKE_CURRENT_BINARY_DIR}/${META_PROJECT_NAME}Config.cmake"
         "${CMAKE_CURRENT_BINARY_DIR}/${META_PROJECT_NAME}ConfigVersion.cmake"
     DESTINATION
-        "${CMAKE_CONFIG_INSTALL_DESTINATION}"
+        "share/${META_PROJECT_NAME}/cmake"
     COMPONENT
         cmake-config
 )
@@ -105,6 +115,19 @@ if(NOT TARGET install-cmake-config)
     )
 endif()
 
+# add install target for pkg-config file
+install(
+    FILES "${CMAKE_CURRENT_BINARY_DIR}/${META_PROJECT_NAME}.pc"
+    DESTINATION "lib${SELECTED_LIB_SUFFIX}/lib"
+    COMPONENT pkg-config
+)
+if(NOT TARGET install-pkg-config)
+    add_custom_target(install-pkg-config
+        DEPENDS ${META_PROJECT_NAME}
+        COMMAND "${CMAKE_COMMAND}" -DCMAKE_INSTALL_COMPONENT=pkg-config -P "${CMAKE_BINARY_DIR}/cmake_install.cmake"
+    )
+endif()
+
 # add install target for dynamic libs
 if(BUILD_SHARED_LIBS)
     install(

cmake/templates/Config.cmake.in

@@ -4,12 +4,13 @@ set(@META_PROJECT_VARNAME@_HAS_SHARED_LIB "@BUILD_SHARED_LIBS@")
 set(@META_PROJECT_VARNAME@_SHARED_LIB "@META_PROJECT_NAME@")
 set(@META_PROJECT_VARNAME@_HAS_STATIC_LIB "@BUILD_STATIC_LIBS@")
 set(@META_PROJECT_VARNAME@_STATIC_LIB "@META_PROJECT_NAME@.a")
-set(@META_PROJECT_VARNAME@_STATIC_LIB_DEPENDS @META_LIB_DEPENDS@)
+set(@META_PROJECT_VARNAME@_STATIC_LIB_DEPENDS @META_STATIC_LIB_DEPENDS@)
 set(@META_PROJECT_VARNAME@_INCLUDE_DIRS "@PACKAGE_HEADER_INSTALL_DESTINATION@")
 set(@META_PROJECT_VARNAME@_BIN_DIR "@PACKAGE_BIN_INSTALL_DESTINATION@")
 set(@META_PROJECT_VARNAME@_LIB_DIR "@PACKAGE_LIB_INSTALL_DESTINATION@")
 set(@META_PROJECT_VARNAME@_MODULE_DIRS "@PACKAGE_CMAKE_MODULE_INSTALL_DESTINATION@")
 set(@META_PROJECT_VARNAME@_CONFIG_DIRS "@PACKAGE_CMAKE_CONFIG_INSTALL_DESTINATION@")
+set(@META_PROJECT_VARNAME@_REQUIRED_CFLAGS "@META_REQUIRED_CFLAGS@")
 
 macro(use_@META_PROJECT_VARNAME@)
     include_directories(BEFORE SYSTEM ${@META_PROJECT_VARNAME@_INCLUDE_DIRS})

cmake/templates/template.pc.in

@@ -0,0 +1,13 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=@LIB_INSTALL_DESTINATION@
+includedir=@HEADER_INSTALL_DESTINATION@
+
+Name: @META_PROJECT_NAME@
+Description: @META_APP_DESCRIPTION@
+Version: @META_APP_VERSION@
+URL: @META_APP_URL@
+
+Libs: -L${libdir} -l@TARGET_PREFIX@@META_PROJECT_NAME@@TARGET_SUFFIX@
+Libs.private: @META_STATIC_LIB_DEPENDS@
+Cflags: -I${includedir} @META_REQUIRED_CFLAGS@