Added CPack packaging, pkg-config and CMake version files. (#298)

CMakeLists.txt

@@ -21,6 +21,8 @@ cmake_minimum_required(VERSION 3.1...3.19)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
 include(cxxopts)
+set("PROJECT_DESCRIPTION" "A header-only lightweight C++ command line option parser")
+set("PROJECT_HOMEPAGE_URL" "https://github.com/jarro2783/cxxopts")
 
 # Get the version of the library
 cxxopts_getversion(VERSION)

cmake/cxxopts.cmake

@@ -87,18 +87,27 @@ endfunction()
 
 # Helper function to ecapsulate install logic
 function(cxxopts_install_logic)
-    set(CXXOPTS_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/cxxopts" CACHE STRING "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
+    string(REPLACE "/${CMAKE_LIBRARY_ARCHITECTURE}" "" CMAKE_INSTALL_LIBDIR_ARCHIND "${CMAKE_INSTALL_LIBDIR}")
+    set(CXXOPTS_CMAKE_DIR "${CMAKE_INSTALL_LIBDIR_ARCHIND}/cmake/cxxopts" CACHE STRING "Installation directory for cmake files, relative to ${CMAKE_INSTALL_PREFIX}.")
     set(version_config "${PROJECT_BINARY_DIR}/cxxopts-config-version.cmake")
     set(project_config "${PROJECT_BINARY_DIR}/cxxopts-config.cmake")
     set(targets_export_name cxxopts-targets)
+    set(PackagingTemplatesDir "${PROJECT_SOURCE_DIR}/packaging")
+
+
+    if(${CMAKE_VERSION} VERSION_GREATER "3.14")
+        set(OPTIONAL_ARCH_INDEPENDENT "ARCH_INDEPENDENT")
+    endif()
 
     # Generate the version, config and target files into the build directory.
     write_basic_package_version_file(
         ${version_config}
         VERSION ${VERSION}
-        COMPATIBILITY AnyNewerVersion)
+        COMPATIBILITY AnyNewerVersion
+        ${OPTIONAL_ARCH_INDEPENDENT}
+    )
     configure_package_config_file(
-        ${PROJECT_SOURCE_DIR}/cxxopts-config.cmake.in
+        ${PackagingTemplatesDir}/cxxopts-config.cmake.in
         ${project_config}
         INSTALL_DESTINATION ${CXXOPTS_CMAKE_DIR})
     export(TARGETS cxxopts NAMESPACE cxxopts::
@@ -114,4 +123,36 @@ function(cxxopts_install_logic)
     # Install the header file and export the target
     install(TARGETS cxxopts EXPORT ${targets_export_name} DESTINATION ${CMAKE_INSTALL_LIBDIR})
     install(FILES ${PROJECT_SOURCE_DIR}/include/cxxopts.hpp DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+
+    set(CPACK_PACKAGE_NAME "${PROJECT_NAME}")
+    set(CPACK_PACKAGE_VENDOR "cxxopt developers")
+    set(CPACK_PACKAGE_DESCRIPTION "${PROJECT_DESCRIPTION}")
+    set(CPACK_DEBIAN_PACKAGE_NAME "${CPACK_PACKAGE_NAME}")
+    set(CPACK_RPM_PACKAGE_NAME "${CPACK_PACKAGE_NAME}")
+    set(CPACK_PACKAGE_HOMEPAGE_URL "${PROJECT_HOMEPAGE_URL}")
+    set(CPACK_PACKAGE_MAINTAINER "${CPACK_PACKAGE_VENDOR}")
+    set(CPACK_DEBIAN_PACKAGE_MAINTAINER "${CPACK_PACKAGE_MAINTAINER}")
+    set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE")
+    set(CPACK_RESOURCE_FILE_README "${CMAKE_CURRENT_SOURCE_DIR}/README.md")
+
+    set(CPACK_DEBIAN_PACKAGE_NAME "lib${PROJECT_NAME}-dev")
+    set(CPACK_DEBIAN_PACKAGE_DEPENDS "libc6-dev")
+    set(CPACK_DEBIAN_PACKAGE_SUGGESTS "cmake, pkg-config, pkg-conf")
+
+    set(CPACK_RPM_PACKAGE_NAME "lib${PROJECT_NAME}-devel")
+    set(CPACK_RPM_PACKAGE_SUGGESTS "${CPACK_DEBIAN_PACKAGE_SUGGESTS}")
+
+    set(CPACK_DEB_COMPONENT_INSTALL ON)
+    set(CPACK_RPM_COMPONENT_INSTALL ON)
+    set(CPACK_NSIS_COMPONENT_INSTALL ON)
+    set(CPACK_DEBIAN_COMPRESSION_TYPE "xz")
+
+    set(PKG_CONFIG_FILE_NAME "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc")
+    configure_file("${PackagingTemplatesDir}/pkgconfig.pc.in" "${PKG_CONFIG_FILE_NAME}" @ONLY)
+    install(FILES "${PKG_CONFIG_FILE_NAME}"
+            DESTINATION "${CMAKE_INSTALL_LIBDIR_ARCHIND}/pkgconfig"
+    )
+
+    include(CPack)
 endfunction()

packaging/pkgconfig.pc.in

@@ -0,0 +1,7 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: @PROJECT_NAME@
+Description: @PROJECT_DESCRIPTION@
+Version: @PROJECT_VERSION@
+Cflags: -I${includedir}