#

# Christoph Heindl 2010

# Precompiled Headers Demo

# http://cheind.wordpress.com

#

# Instructs the MSVC toolset to use the precompiled header PRECOMPILED_HEADER

# for each source file given in the collection named by SOURCE_VARIABLE_NAME.

if(WITH_HEADER_PRECOMP)

if (MSVC)

function(enable_precompiled_headers_msvc PRECOMPILED_HEADER SOURCE_VARIABLE_NAME)

set(files ${${SOURCE_VARIABLE_NAME}})

# Generate precompiled header translation unit

get_filename_component(pch_basename ${PRECOMPILED_HEADER} NAME_WE)

set(pch_abs ${PRECOMPILED_HEADER})

set(pch_unity ${pch_basename}.cpp)

FILE(WRITE ${pch_unity} "// Precompiled header unity generated by CMake\n")

FILE(APPEND ${pch_unity} "#include <${pch_abs}>\n")

set_source_files_properties(${pch_unity} PROPERTIES COMPILE_FLAGS "/Yc\"${pch_abs}\"")

# Update properties of source files to use the precompiled header.

# Additionally, force the inclusion of the precompiled header at beginning of each source file.

foreach(source_file ${files} )

set_source_files_properties(

${source_file}

PROPERTIES COMPILE_FLAGS

"/Yu\"${pch_abs}\" /FI\"${pch_abs}\""

)

endforeach(source_file)

# Finally, update the source file collection to contain the precompiled header translation unit

set(${SOURCE_VARIABLE_NAME} ${${SOURCE_VARIABLE_NAME}} ${pch_unity} PARENT_SCOPE)

endfunction(enable_precompiled_headers_msvc)

elseif(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_IS_CLANG)

function(enable_precompiled_headers_GCC HEADER_NAME TARGET_NAME EXTRA_CXX_FLAGS)

GET_FILENAME_COMPONENT(_name ${HEADER_NAME} NAME)

SET(_source "${PROJECT_SOURCE_DIR}/include/${HEADER_NAME}")

set_directory_properties(PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES _source)

if(CMAKE_CXX_COMPILER_IS_CLANG)

set(precompiled_header "${CMAKE_SOURCE_DIR}/include/${HEADER_NAME}.pch")

set(pch_flags -x c++-header ${_source} -o ${precompiled_header})

set(pch_include_flag "-include-pch ${precompiled_header}")

elseif(CMAKE_COMPILER_IS_GNUCXX)

set(precompiled_header "${CMAKE_SOURCE_DIR}/include/${HEADER_NAME}.gch")

set(pch_flags ${_source} -o ${precompiled_header})

set(pch_include_flag "-include ${HEADER_NAME}")

endif()

set(precompiled_header ${precompiled_header} PARENT_SCOPE)

SET(OPTION_HP "-x c++-header")

STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name)

SET(_compiler_FLAGS ${${_flags_var_name}} ${EXTRA_CXX_FLAGS} ${CMAKE_CXX_FLAGS})

GET_DIRECTORY_PROPERTY(_directory_flags INCLUDE_DIRECTORIES)

include_dirs_to_flags("${_directory_flags}" directory_includes)

list(REMOVE_DUPLICATES directory_includes)

list(APPEND _compiler_FLAGS ${directory_includes})

GET_DIRECTORY_PROPERTY(_directory_flags COMPILE_DEFINITIONS)

foreach(item ${_directory_flags})

LIST(APPEND _compiler_FLAGS "-D${item}")

endforeach()

GET_DIRECTORY_PROPERTY(_directory_flags COMPILE_OPTIONS)

LIST(APPEND _compiler_FLAGS ${_directory_flags})

list(REMOVE_DUPLICATES _compiler_FLAGS)

SEPARATE_ARGUMENTS(_compiler_FLAGS)

ADD_CUSTOM_COMMAND(

OUTPUT ${precompiled_header}

COMMAND ${CMAKE_CXX_COMPILER} ${_compiler_FLAGS} ${pch_flags} -Winvalid-pch

DEPENDS ${_source} IMPLICIT_DEPENDS CXX ${_source})

ADD_CUSTOM_TARGET(${TARGET_NAME}_${EXT_HP} DEPENDS ${precompiled_header})

ADD_DEPENDENCIES(${TARGET_NAME} ${TARGET_NAME}_${EXT_HP})

foreach(file ${Elise_Src_Files})

if (NOT ${file} MATCHES "tiff/el_dcraw.c" AND

NOT ${file} MATCHES "mullgesuhlig/muvmblock.cpp" AND

NOT ${file} MATCHES "mullgesuhlig/mubasic.cpp" AND

NOT ${file} MATCHES "mullgesuhlig/muflaguer.cpp" AND

NOT ${file} MATCHES "mullgesuhlig/mufmueller.cpp")

set_source_files_properties(${file} PROPERTIES COMPILE_FLAGS "${pch_include_flag}")

endif()

endforeach()

endfunction(enable_precompiled_headers_GCC)

endif()

endif()