[x265] [PATCH] cmake: generate and install pkgconfig file

[Steve Borho]

# HG changeset patch
# User Steve Borho <steve at borho.org>
# Date 1382480398 18000
#      Tue Oct 22 17:19:58 2013 -0500
# Node ID a8d4928926e82026ed71ca0af210a5f4f16d405d
# Parent  6d96d64c4e9a2c526b57274760a7147241328cb3
cmake: generate and install pkgconfig file

This installs the x265.pc into /usr/local/lib/pkgconfig/ with these contents:

prefix=/usr/local
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: x265
Description: H.265/HEVC video encoder
Version: 0.4.1
Libs: -L${libdir} -lx265
Libs.private:  -lstdc++ -lm -lc -lpthread -lrt
Cflags: -I${includedir}

The pkg-config file is only generated and installed if CMake finds pkg-config

Q1: it seems unwise to hard-code "/lib" in a few places, what if lib64 is
used or something else?
Q2: Should x265.pc have a version number like x265-0.4.1.pc?

diff -r 6d96d64c4e9a -r a8d4928926e8 source/CMakeLists.txt
--- a/source/CMakeLists.txt	Tue Oct 22 23:36:36 2013 +0530
+++ b/source/CMakeLists.txt	Tue Oct 22 17:19:58 2013 -0500
@@ -108,7 +108,7 @@
 endif(YASM_FOUND)
 
 if(UNIX)
-    SET(PLATFORM_LIBS pthread m)
+    SET(PLATFORM_LIBS pthread)
     if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
         SET(PLATFORM_LIBS ${PLATFORM_LIBS} rt)
     endif(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
@@ -182,6 +182,18 @@
             RUNTIME DESTINATION bin
             LIBRARY DESTINATION lib
             ARCHIVE DESTINATION lib)
+
+    include(FindPkgConfig QUIET)
+    if(PKG_CONFIG_FOUND)
+        # convert lists of link libraries into -lstdc++ -lm etc..
+        foreach(LIB ${CMAKE_CXX_IMPLICIT_LINK_LIBRARIES} ${PLATFORM_LIBS})
+            set(PRIVATE_LIBS "${PRIVATE_LIBS} -l${LIB}")
+        endforeach()
+        # Produce a pkg-config file for linking against the shared lib
+        configure_file("x265.pc.in" "x265.pc" @ONLY)
+        install(FILES       "${CMAKE_CURRENT_BINARY_DIR}/x265.pc"
+                DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig")
+    endif()
 endif()
 install(TARGETS x265-static
         RUNTIME DESTINATION bin
diff -r 6d96d64c4e9a -r a8d4928926e8 source/x265.pc.in
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/x265.pc.in	Tue Oct 22 17:19:58 2013 -0500
@@ -0,0 +1,11 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: @CMAKE_PROJECT_NAME@
+Description: H.265/HEVC video encoder
+Version: @X265_LATEST_TAG@
+Libs: -L${libdir} -lx265
+Libs.private: @PRIVATE_LIBS@
+Cflags: -I${includedir}