Enable link-time optimization on MSVC

CMakeLists.txt

@@ -384,6 +384,12 @@ if (CMAKE_COMPILER_IS_GNUCC)
     if ("${GCC_VERSION}" VERSION_GREATER 4.6 OR "${GCC_VERSION}" VERSION_EQUAL 4.6)
         SET(CMAKE_CXX_FLAGS "-Wno-unused-but-set-parameter ${CMAKE_CXX_FLAGS}")
     endif("${GCC_VERSION}" VERSION_GREATER 4.6 OR "${GCC_VERSION}" VERSION_EQUAL 4.6)
+elseif (MSVC)
+    # Enable link-time code generation globally for all linking
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /GL")
+    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /LTCG")
+    set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /LTCG")
+    set(CMAKE_STATIC_LINKER_FLAGS_RELEASE "${CMAKE_STATIC_LINKER_FLAGS_RELEASE} /LTCG")
 endif (CMAKE_COMPILER_IS_GNUCC)
 
 IF(NOT WIN32 AND NOT APPLE)