Add support for absolute CMAKE_INSTALL_*DIR

Author: otegami

CMakeLists.txt

@@ -28,10 +28,16 @@ SET (VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_REVISION})
 
 LIST (APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
 include(GNUInstallDirs)
-SET (prefix ${CMAKE_INSTALL_PREFIX})
-SET (exec_prefix ${CMAKE_INSTALL_PREFIX})
-SET (libdir ${CMAKE_INSTALL_LIBDIR})
-SET (includedir ${CMAKE_INSTALL_INCLUDEDIR})
+if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+    set(MSGPACK_PKG_CONFIG_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+else()
+    set(MSGPACK_PKG_CONFIG_LIBDIR "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+endif()
+if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+    set(MSGPACK_PKG_CONFIG_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+    set(MSGPACK_PKG_CONFIG_INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+endif()
 
 OPTION (MSGPACK_32BIT "32bit compile" OFF)
 

msgpack-c.pc.in

@@ -1,7 +1,6 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@MSGPACK_PKG_CONFIG_INCLUDEDIR@
+libdir=@MSGPACK_PKG_CONFIG_LIBDIR@
 
 Name: MessagePack
 Description: Binary-based efficient object serialization library