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# Not supported officially my cmake
# but there is a cmake ticket with examples
# http://www.vtk.org/Bug/view.php?id=1260
# use this macro before <add_library>
#
# _header : header to make a .gch
# _sources: the variable name (do not use ${..}) which contains a
# a list of sources (a.cpp b.cpp c.cpp ...)
# This macro will append a header file to it, then this
# src_list can be used in <add_library>
#
# Now a .gch file should be generated and gcc should use it.
# (add -Winvalid-pch to the cpp flags to verify)
#
# make clean should delete the pch file
#
# example : kst_add_pch_rule(pch.h source_list_name SHARED)
macro(kst_add_pch_rule _header _sources _lib_type)
if(CMAKE_COMPILER_IS_GNUCC)
# first we have to find all compiler arguments
get_directory_property(_definitions COMPILE_DEFINITIONS)
foreach (_it ${_definitions})
list(APPEND _args "$<$<BOOL:${_it}>:-D${_it}>")
endforeach()
list(APPEND _args ${CMAKE_CXX_FLAGS})
if(CMAKE_BUILD_TYPE MATCHES Release)
list(APPEND _args ${CMAKE_CXX_FLAGS_RELEASE})
get_directory_property(_definitions_type COMPILE_DEFINITIONS_RELEASE)
else()
list(APPEND _args ${CMAKE_CXX_FLAGS_DEBUG})
get_directory_property(_definitions_type COMPILE_DEFINITIONS_DEBUG)
endif()
if(${_lib_type} MATCHES SHARED)
list(APPEND _args ${CMAKE_SHARED_LIBRARY_CXX_FLAGS})
endif()
list(APPEND _args "$<$<BOOL:${_definitions_type}>:-D${_definitions_type}>")
#message(STATUS "pch: ${_args}")
get_directory_property(DIRINC INCLUDE_DIRECTORIES)
foreach (_inc ${DIRINC})
LIST(APPEND _args "-I" ${_inc})
endforeach(_inc ${DIRINC})
set(_gch_filename "${_header}.gch")
list(APPEND ${_sources} ${_gch_filename})
list(APPEND _args -c ${_header} -o ${_gch_filename})
separate_arguments(_args)
# now build the pch with the compiler arguments
add_custom_command(OUTPUT ${_gch_filename}
COMMAND ${CMAKE_COMMAND} -E remove ${_gch_filename}
COMMAND ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_COMPILER_ARG1} ${_args}
DEPENDS ${_header})
# all other files should use the pch
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Winvalid-pch -include ${_header}")
else()
file(WRITE ${_header}.tmp "#include \"${_header}\"\n")
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different ${_header}.tmp ${_header}.cpp)
if(MSVC_IDE)
set(use_pch "/Fp${_header}.\$(Configuration).pch")
else()
set(use_pch /Fp${_header}.pch)
endif()
set_source_files_properties(${_header}.cpp PROPERTIES COMPILE_FLAGS "/Yc\"${_header}\" ${use_pch}")
# Bug in cmake: next line also compile .c files with pchs
#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /FI${_header} /Yu${_header} ${use_pch}")
foreach(it ${${_sources}})
get_filename_component(ext ${it} EXT)
if(ext STREQUAL .c)
else()
set_source_files_properties(${it} PROPERTIES COMPILE_FLAGS "/FI${_header} /Yu${_header} ${use_pch}")
endif()
endforeach()
list(APPEND ${_sources} ${_header} ${_header}.cpp)
endif()
endmacro()
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