1 files changed, 104 insertions, 0 deletions
diff --git a/src/cmake/macros/FindPCHSupport.cmake b/src/cmake/macros/FindPCHSupport.cmake
new file mode 100644
index 0000000000..b068b69c26
--- /dev/null
+++ b/src/cmake/macros/FindPCHSupport.cmake
@@ -0,0 +1,104 @@
+FUNCTION(GET_COMMON_PCH_PARAMS PCH_HEADER PCH_FE INCLUDE_PREFIX)
+  GET_FILENAME_COMPONENT(PCH_HEADER_N ${PCH_HEADER} NAME)
+  GET_DIRECTORY_PROPERTY(TARGET_INCLUDES INCLUDE_DIRECTORIES)
+
+  FOREACH(ITEM ${TARGET_INCLUDES})
+    LIST(APPEND INCLUDE_FLAGS_LIST "${INCLUDE_PREFIX}\"${ITEM}\" ")
+  ENDFOREACH(ITEM)
+
+  SET(PCH_HEADER_NAME ${PCH_HEADER_N} PARENT_SCOPE)
+  SET(PCH_HEADER_OUT ${CMAKE_CURRENT_BINARY_DIR}/${PCH_HEADER_N}.${PCH_FE} PARENT_SCOPE)
+  SET(INCLUDE_FLAGS ${INCLUDE_FLAGS_LIST} PARENT_SCOPE)
+ENDFUNCTION(GET_COMMON_PCH_PARAMS)
+
+FUNCTION(GENERATE_CXX_PCH_COMMAND TARGET_NAME INCLUDE_FLAGS IN PCH_SRC OUT)
+  IF (CMAKE_BUILD_TYPE)
+    STRING(TOUPPER _${CMAKE_BUILD_TYPE} CURRENT_BUILD_TYPE)
+  ENDIF ()
+
+  SET(COMPILE_FLAGS ${CMAKE_CXX_FLAGS${CURRENT_BUILD_TYPE}})
+  LIST(APPEND COMPILE_FLAGS ${CMAKE_CXX_FLAGS})
+
+  IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Darwin")
+    IF (NOT "${CMAKE_OSX_ARCHITECTURES}" STREQUAL "")
+      LIST(APPEND COMPILE_FLAGS "-arch ${CMAKE_OSX_ARCHITECTURES}")
+    ENDIF ()
+    IF (NOT "${CMAKE_OSX_SYSROOT}" STREQUAL "")
+      LIST(APPEND COMPILE_FLAGS "-isysroot ${CMAKE_OSX_SYSROOT}")
+    ENDIF ()
+    IF (NOT "${CMAKE_OSX_DEPLOYMENT_TARGET}" STREQUAL "")
+      LIST(APPEND COMPILE_FLAGS "-mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET}")
+    ENDIF ()
+  ENDIF ()
+
+  GET_DIRECTORY_PROPERTY(TARGET_DEFINITIONS COMPILE_DEFINITIONS)
+  FOREACH(ITEM ${TARGET_DEFINITIONS})
+    LIST(APPEND DEFINITION_FLAGS "-D${ITEM} ")
+  ENDFOREACH(ITEM)
+
+  SEPARATE_ARGUMENTS(COMPILE_FLAGS)
+  SEPARATE_ARGUMENTS(INCLUDE_FLAGS)
+  SEPARATE_ARGUMENTS(DEFINITION_FLAGS)
+
+  GET_FILENAME_COMPONENT(PCH_SRC_N ${PCH_SRC} NAME)
+  ADD_LIBRARY(${PCH_SRC_N}_dephelp MODULE ${PCH_SRC})
+
+  ADD_CUSTOM_COMMAND(
+    OUTPUT ${OUT}
+    COMMAND ${CMAKE_CXX_COMPILER}
+    ARGS ${DEFINITION_FLAGS} ${COMPILE_FLAGS} ${INCLUDE_FLAGS} -x c++-header ${IN} -o ${OUT}
+    DEPENDS ${IN} ${PCH_SRC_N}_dephelp
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  )
+
+  ADD_CUSTOM_TARGET(generate_${PCH_SRC_N}
+    DEPENDS ${OUT}
+  )
+
+  ADD_DEPENDENCIES(${TARGET_NAME} generate_${PCH_SRC_N})
+ENDFUNCTION(GENERATE_CXX_PCH_COMMAND)
+
+FUNCTION(ADD_CXX_PCH_GCC TARGET_NAME PCH_HEADER PCH_SOURCE)
+  GET_COMMON_PCH_PARAMS(${PCH_HEADER} "gch" "-I")
+  GENERATE_CXX_PCH_COMMAND(${TARGET_NAME} "${INCLUDE_FLAGS}" ${PCH_HEADER} ${PCH_SOURCE} ${PCH_HEADER_OUT})
+  SET_TARGET_PROPERTIES(
+    ${TARGET_NAME} PROPERTIES
+    COMPILE_FLAGS "-include ${CMAKE_CURRENT_BINARY_DIR}/${PCH_HEADER_NAME}"
+  )
+ENDFUNCTION(ADD_CXX_PCH_GCC)
+
+FUNCTION(ADD_CXX_PCH_CLANG TARGET_NAME PCH_HEADER PCH_SOURCE)
+  GET_COMMON_PCH_PARAMS(${PCH_HEADER} "pch" "-I")
+  GENERATE_CXX_PCH_COMMAND(${TARGET_NAME} "${INCLUDE_FLAGS}" ${PCH_HEADER} ${PCH_SOURCE} ${PCH_HEADER_OUT})
+  SET_TARGET_PROPERTIES(
+    ${TARGET_NAME} PROPERTIES
+    COMPILE_FLAGS "-include-pch ${PCH_HEADER_OUT}"
+  )
+ENDFUNCTION(ADD_CXX_PCH_CLANG)
+
+FUNCTION(ADD_CXX_PCH_MSVC TARGET_NAME PCH_HEADER PCH_SOURCE)
+  GET_COMMON_PCH_PARAMS(${PCH_HEADER} "pch" "/I")
+  SET_TARGET_PROPERTIES(
+    ${TARGET_NAME} PROPERTIES
+    COMPILE_FLAGS "/FI${PCH_HEADER_NAME} /Yu${PCH_HEADER_NAME}"
+  )
+  SET_SOURCE_FILES_PROPERTIES(
+    ${PCH_SOURCE} PROPERTIES
+    COMPILE_FLAGS "/Yc${PCH_HEADER_NAME}"
+  )
+ENDFUNCTION(ADD_CXX_PCH_MSVC)
+
+FUNCTION(ADD_CXX_PCH TARGET_NAME PCH_HEADER PCH_SOURCE)
+  IF (MSVC)
+    ADD_CXX_PCH_MSVC(${TARGET_NAME} ${PCH_HEADER} ${PCH_SOURCE})
+  ELSEIF ("${CMAKE_GENERATOR}" MATCHES "Xcode")
+    SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
+      XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER YES
+      XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/${PCH_HEADER}"
+    )
+  ELSEIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
+    ADD_CXX_PCH_CLANG(${TARGET_NAME} ${PCH_HEADER} ${PCH_SOURCE})
+  ELSEIF ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
+    ADD_CXX_PCH_GCC(${TARGET_NAME} ${PCH_HEADER} ${PCH_SOURCE})
+  ENDIF ()
+ENDFUNCTION(ADD_CXX_PCH)