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macro( precompiled_header includes header_name build_pch)
if (NOT "${CMAKE_GENERATOR}" STREQUAL "Xcode")
message(STATUS "Precompiled header generation")
# Get the compiler flags for this build type
string( TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" flags_for_build_name )
set( compile_flags "${CMAKE_CXX_FLAGS} ${${flags_for_build_name}}" )
# Add all the Qt include directories
foreach( item ${${includes}} )
list( APPEND compile_flags "-I${item}" )
endforeach()
# Get the list of all build-independent preprocessor definitions
get_directory_property( defines_global COMPILE_DEFINITIONS )
list( APPEND defines ${defines_global} )
# Get the list of all build-dependent preprocessor definitions
string( TOUPPER "COMPILE_DEFINITIONS_${CMAKE_BUILD_TYPE}" defines_for_build_name )
get_directory_property( defines_build ${defines_for_build_name} )
list( APPEND defines ${defines_build} )
# Add the "-D" prefix to all of them
foreach( item ${defines} )
list( APPEND all_define_flags "-D${item}" )
endforeach()
list( APPEND compile_flags ${all_define_flags} )
# Prepare the compile flags var for passing to GCC
separate_arguments( compile_flags )
set (PCH_HEADER "${PROJECT_BINARY_DIR}/${header_name}.h")
set (PCH_INCLUDE "-include ${PCH_HEADER}")
if( ${build_pch} )
set (PCH ${PROJECT_BINARY_DIR}/${header_name}.h.gch)
add_custom_command(
OUTPUT ${PROJECT_BINARY_DIR}/${header_name}.h.gch
COMMAND ${CMAKE_CXX_COMPILER} -x c++-header -g ${compile_flags} -o ${header_name}.h.gch ${header_name}.h
DEPENDS ${PROJECT_BINARY_DIR}/${header_name}.h
WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
VERBATIM
)
else ( ${build_pch} )
message(STATUS "No precompiled header")
endif( ${build_pch} )
endif()
endmacro()
# Xcode PCH support. Has to be called *AFTER* the target is created.
# "header_name" - the name of the PCH header, without the extension; "all" or something similar;
# note that the source file compiling the header needs to have the same name
macro( xcode_pch target_name header_name )
if( APPLE )
set_target_properties(
${target_name}
PROPERTIES
XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${PROJECT_BINARY_DIR}/${header_name}.h"
XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES"
)
endif()
endmacro()
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