cmake: streamline *.pc file handling via a module

1 files changed, 110 insertions, 0 deletions

diff --git a/cmake/Modules/PkgBuildConfig.cmake b/cmake/Modules/PkgBuildConfig.cmake
new file mode 100644
index 000000000..1c0079eb0
--- /dev/null
+++ b/cmake/Modules/PkgBuildConfig.cmake
@@ -0,0 +1,110 @@
+# pkg-config file generation
+#
+# Uses the following globals:
+# - PKG_BUILD_PREFIX: the build location (aka prefix). Defaults to CMAKE_INSTALL_PREFIX
+# - PKG_BUILD_LIBDIR: the libdir location. Defaults to ${prefix}/lib.
+# - PKG_BUILD_INCLUDEDIR: the includedir location. Defaults to ${prefix}/include.
+#
+
+function(pkg_build_config)
+    set(options)
+    set(oneValueArgs NAME DESCRIPTION VERSION FILENAME LIBS_SELF)
+    set(multiValueArgs LIBS PRIVATE_LIBS REQUIRES CFLAGS)
+
+    cmake_parse_arguments(PKGCONFIG "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+    if (NOT DEFINED PKGCONFIG_FILENAME AND DEFINED PKGCONFIG_NAME)
+        set(PKGCONFIG_FILENAME ${PKGCONFIG_NAME})
+    endif()
+    if (NOT DEFINED PKGCONFIG_FILENAME)
+        message(FATAL_ERROR "Missing FILENAME argument")
+    endif()
+    set(PKGCONFIG_FILE "${PROJECT_BINARY_DIR}/${PKGCONFIG_FILENAME}.pc")
+
+    if (NOT DEFINED PKGCONFIG_DESCRIPTION)
+        message(FATAL_ERROR "Missing DESCRIPTION argument")
+    endif()
+
+    if (NOT DEFINED PKGCONFIG_VERSION)
+        message(FATAL_ERROR "Missing VERSION argument")
+    endif()
+
+    if (DEFINED PKG_BUILD_PREFIX)
+        set(PKGCONFIG_PREFIX "${PKG_BUILD_PREFIX}")
+    else()
+        set(PKGCONFIG_PREFIX "${CMAKE_INSTALL_PREFIX}")
+    endif()
+
+    if(DEFINED PKG_BUILD_LIBDIR)
+        if (IS_ABSOLUTE ${PKG_BUILD_LIBDIR})
+            set(PKGCONFIG_LIBDIR ${PKG_BUILD_LIBDIR})
+        else()
+            set(PKGCONFIG_LIBDIR "\${prefix}/${PKG_BUILD_LIBDIR}")
+        endif()
+    else()
+        set(PKGCONFIG_LIBDIR "\${prefix}/lib")
+    endif()
+
+    if(DEFINED PKG_BUILD_INCLUDEDIR)
+        if (IS_ABSOLUTE ${PKG_BUILD_INCLUDEDIR})
+            set(PKGCONFIG_INCLUDEDIR ${PKG_BUILD_INCLUDEDIR})
+        else()
+            set(PKGCONFIG_INCLUDEDIR "\${prefix}/${PKG_BUILD_INCLUDEDIR}")
+        endif()
+    else()
+        set(PKGCONFIG_INCLUDEDIR "\${prefix}/include")
+    endif()
+
+    # Write .pc "header"
+    file(WRITE "${PKGCONFIG_FILE}"
+        "prefix=\"${PKGCONFIG_PREFIX}\"\n"
+        "libdir=\"${PKGCONFIG_LIBDIR}\"\n"
+        "includedir=\"${PKGCONFIG_INCLUDEDIR}\"\n"
+        "\n"
+        "Name: ${PKGCONFIG_NAME}\n"
+        "Description: ${PKGCONFIG_DESCRIPTION}\n"
+        "Version: ${PKGCONFIG_VERSION}\n"
+    )
+
+    # Prepare Libs
+    if(NOT DEFINED PKGCONFIG_LIBS_SELF)
+        set(PKGCONFIG_LIBS_SELF "${PKGCONFIG_FILE}")
+    endif()
+
+    if(NOT DEFINED PKGCONFIG_LIBS)
+        set(PKGCONFIG_LIBS "-l${PKGCONFIG_LIBS_SELF}")
+    else()
+        list(INSERT PKGCONFIG_LIBS 0 "-l${PKGCONFIG_LIBS_SELF}")
+    endif()
+
+    list(REMOVE_DUPLICATES PKGCONFIG_LIBS)
+    string(REPLACE ";" " " PKGCONFIG_LIBS "${PKGCONFIG_LIBS}")
+    file(APPEND "${PKGCONFIG_FILE}" "Libs: -L\${libdir} ${PKGCONFIG_LIBS}\n")
+
+    # Prepare Libs.private
+    if(DEFINED PKGCONFIG_PRIVATE_LIBS)
+        list(REMOVE_DUPLICATES PKGCONFIG_PRIVATE_LIBS)
+        string(REPLACE ";" " " PKGCONFIG_PRIVATE_LIBS "${PKGCONFIG_PRIVATE_LIBS}")
+        file(APPEND "${PKGCONFIG_FILE}" "Libs.private: ${PKGCONFIG_PRIVATE_LIBS}\n")
+    endif()
+
+    # Prepare Requires.private
+    if(DEFINED PKGCONFIG_REQUIRES)
+        list(REMOVE_DUPLICATES PKGCONFIG_REQUIRES)
+        string(REPLACE ";" " " PKGCONFIG_REQUIRES "${PKGCONFIG_REQUIRES}")
+        file(APPEND "${PKGCONFIG_FILE}" "Requires.private: ${PKGCONFIG_REQUIRES}\n")
+    endif()
+
+    # Prepare Cflags
+    if(DEFINED PKGCONFIG_CFLAGS)
+        string(REPLACE ";" " " PKGCONFIG_CFLAGS "${PKGCONFIG_CFLAGS}")
+    else()
+        set(PKGCONFIG_CFLAGS "")
+    endif()
+    file(APPEND "${PKGCONFIG_FILE}" "Cflags: -I\${includedir} ${PKGCONFIG_CFLAGS}\n")
+
+    # Install .pc file
+    install(FILES "${PKGCONFIG_FILE}"
+        DESTINATION "${PKGCONFIG_PREFIX}/${PKGCONFIG_LIBDIR}/pkgconfig"
+    )
+endfunction()