- CMake: use precompiled headers when compiling for msvc. This makes compilation about 40% faster.

CMakeLists.txt

@@ -27,6 +27,8 @@ endif()
 INCLUDE (FindPkgConfig)
 INCLUDE_DIRECTORIES( include )
 
+INCLUDE (PrecompiledHeader)
+
 # If this is an in-source build (CMAKE_SOURCE_DIR == CMAKE_BINARY_DIR),
 # write the library/executable files to the respective directories in the
 # source tree. During an out-of-source build, however, do not litter this

cmake-modules/PrecompiledHeader.cmake

@@ -0,0 +1,25 @@
+MACRO(ADD_MSVC_PRECOMPILED_HEADER PrecompiledHeader PrecompiledSource SourcesVar)
+  IF(MSVC)
+    GET_FILENAME_COMPONENT(PrecompiledBasename ${PrecompiledHeader} NAME_WE)
+    SET(PrecompiledBinary "${CMAKE_CURRENT_BINARY_DIR}/${PrecompiledBasename}.pch")
+    SET(Sources ${${SourcesVar}})
+
+    SET_SOURCE_FILES_PROPERTIES(${PrecompiledSource}
+                                PROPERTIES COMPILE_FLAGS "/Yc\"${PrecompiledHeader}\" /Fp\"${PrecompiledBinary}\""
+                                           OBJECT_OUTPUTS "${PrecompiledBinary}")
+										   
+	# Do not consider .c files
+	foreach(fname ${Sources}) 
+		GET_FILENAME_COMPONENT(fext ${fname} EXT)
+		if(fext STREQUAL ".cpp")
+			SET_SOURCE_FILES_PROPERTIES(${fname}
+                                PROPERTIES COMPILE_FLAGS "/Yu\"${PrecompiledBinary}\" /FI\"${PrecompiledBinary}\" /Fp\"${PrecompiledBinary}\""
+                                           OBJECT_DEPENDS "${PrecompiledBinary}")     
+		endif(fext STREQUAL ".cpp")
+	endforeach(fname) 
+										   
+  ENDIF(MSVC)
+  # Add precompiled header to SourcesVar
+  LIST(APPEND ${SourcesVar} ${PrecompiledSource})
+	
+ENDMACRO(ADD_MSVC_PRECOMPILED_HEADER)

code/CMakeLists.txt

@@ -58,8 +58,6 @@ SET( PUBLIC_HEADERS
 
 SET( Core_SRCS
 	Assimp.cpp
-	AssimpPCH.cpp
-	AssimpPCH.h
 )
 
 SET( Boost_SRCS
@@ -620,7 +618,7 @@ else (UNZIP_FOUND)
 	SET (unzip_compile_SRCS ${unzip_SRCS})
 endif (UNZIP_FOUND)
 
-SET( assim_src
+SET( assimp_src
 	# Assimp Files
 	${Core_SRCS}
 	${Common_SRCS}
@@ -681,13 +679,16 @@ SET( assim_src
 	${PUBLIC_HEADERS}
 	${COMPILER_HEADERS}
 )
+
+ADD_MSVC_PRECOMPILED_HEADER("AssimpPCH.h" "AssimpPCH.cpp" assimp_src)
+
 IF ( ASSIMP_BUILD_STATIC_LIB )
 	ADD_LIBRARY( assimp STATIC
-		${assim_src}
+		${assimp_src}
 	)
 ELSE ( ASSIMP_BUILD_STATIC_LIB )
 	ADD_LIBRARY( assimp SHARED
-		${assim_src}
+		${assimp_src}
 	)
 ENDIF ( ASSIMP_BUILD_STATIC_LIB )