khanat-opennel-code/code/nel/CMakeModules/PCHSupport.cmake

# - Try to find precompiled headers support for GCC 3.4 and 4.x (and MSVC)
# Once done this will define:
#
# Variable:
#   PCHSupport_FOUND
#
# Macro:
#   ADD_PRECOMPILED_HEADER  _targetName _inputh _inputcpp _dowarn
#   ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use _dowarn
#   ADD_NATIVE_PRECOMPILED_HEADER _targetName _inputh _inputcpp _dowarn

IF(CMAKE_COMPILER_IS_GNUCXX)

	EXEC_PROGRAM(
		${CMAKE_CXX_COMPILER}
		ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
		OUTPUT_VARIABLE gcc_compiler_version)
	#MESSAGE("GCC Version: ${gcc_compiler_version}")
	IF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")
		SET(PCHSupport_FOUND TRUE)
	ELSE(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")
		IF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]")
			SET(PCHSupport_FOUND TRUE)
		ENDIF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]")
	ENDIF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")

	SET(_PCH_include_prefix "-I")

ELSE(CMAKE_COMPILER_IS_GNUCXX)

	IF(WIN32)
		SET(PCHSupport_FOUND TRUE) # for experimental msvc support
		SET(_PCH_include_prefix "/I")
	ELSE(WIN32)
		SET(PCHSupport_FOUND FALSE)
	ENDIF(WIN32)

ENDIF(CMAKE_COMPILER_IS_GNUCXX)

MACRO(_PCH_GET_COMPILE_FLAGS _out_compile_flags)

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

	IF(CMAKE_COMPILER_IS_GNUCXX)

		GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)
		IF(${_targetType} STREQUAL SHARED_LIBRARY AND NOT WIN32)
			LIST(APPEND ${_out_compile_flags} "${${_out_compile_flags}} -fPIC")
		ENDIF(${_targetType} STREQUAL SHARED_LIBRARY AND NOT WIN32)

	ELSE(CMAKE_COMPILER_IS_GNUCXX)
		## TODO ... ? or does it work out of the box
	ENDIF(CMAKE_COMPILER_IS_GNUCXX)

	GET_DIRECTORY_PROPERTY(DIRINC INCLUDE_DIRECTORIES )
	FOREACH(item ${DIRINC})
		LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}${item}")
	ENDFOREACH(item)

	GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS)
	GET_DIRECTORY_PROPERTY(_global_definitions DIRECTORY ${CMAKE_SOURCE_DIR} DEFINITIONS)
	#MESSAGE("_directory_flags ${_directory_flags} ${_global_definitions}" )
	LIST(APPEND ${_out_compile_flags} ${_directory_flags})
	LIST(APPEND ${_out_compile_flags} ${_global_definitions})
	LIST(APPEND ${_out_compile_flags} ${CMAKE_CXX_FLAGS} )

	SEPARATE_ARGUMENTS(${_out_compile_flags})

ENDMACRO(_PCH_GET_COMPILE_FLAGS)

MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)

	FILE(TO_NATIVE_PATH ${_input} _native_input)
	FILE(TO_NATIVE_PATH ${_output} _native_output)


	IF(CMAKE_COMPILER_IS_GNUCXX)
		IF(CMAKE_CXX_COMPILER_ARG1)
			# remove leading space in compiler argument
			STRING(REGEX REPLACE "^ +" "" pchsupport_compiler_cxx_arg1 ${CMAKE_CXX_COMPILER_ARG1})

			SET(${out_command}
				${CMAKE_CXX_COMPILER} ${pchsupport_compiler_cxx_arg1} ${_compile_FLAGS}	-x c++-header -o ${_output} ${_input}
				)
		ELSE(CMAKE_CXX_COMPILER_ARG1)
			SET(${out_command}
				${CMAKE_CXX_COMPILER}  ${_compile_FLAGS}	-x c++-header -o ${_output} ${_input}
				)
		ENDIF(CMAKE_CXX_COMPILER_ARG1)
	ELSE(CMAKE_COMPILER_IS_GNUCXX)

		# nothing to do because std*.cpp are already added to target

	ENDIF(CMAKE_COMPILER_IS_GNUCXX)

ENDMACRO(_PCH_GET_COMPILE_COMMAND )



MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags  _header_name _pch_path _dowarn )

	FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)

	IF(CMAKE_COMPILER_IS_GNUCXX)
		# for use with distcc and gcc >4.0.1 if preprocessed files are accessible
		# on all remote machines set
		# PCH_ADDITIONAL_COMPILER_FLAGS to -fpch-preprocess
		# if you want warnings for invalid header files (which is very inconvenient
		# if you have different versions of the headers for different build types
		# you may set _pch_dowarn
		IF (_dowarn)
			SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include ${CMAKE_CURRENT_BINARY_DIR}/${_header_name} -Winvalid-pch " )
		ELSE (_dowarn)
			SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include ${CMAKE_CURRENT_BINARY_DIR}/${_header_name} " )
		ENDIF (_dowarn)
	ELSE(CMAKE_COMPILER_IS_GNUCXX)

		set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )

	ENDIF(CMAKE_COMPILER_IS_GNUCXX)

ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )

MACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input _output)
	GET_FILENAME_COMPONENT(_name ${_input} NAME)
	GET_FILENAME_COMPONENT(_path ${_input} PATH)
	SET(_output "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch/${_targetName}_${CMAKE_BUILD_TYPE}.gch")
ENDMACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input)


MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )

	# to do: test whether compiler flags match between target  _targetName
	# and _pch_output_to_use
	GET_FILENAME_COMPONENT(_name ${_input} NAME)

	IF( "${ARGN}" STREQUAL "0")
		SET(_dowarn 0)
	ELSE( "${ARGN}" STREQUAL "0")
		SET(_dowarn 1)
	ENDIF("${ARGN}" STREQUAL "0")


	_PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
	#   MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
	SET_TARGET_PROPERTIES(${_targetName}
		PROPERTIES
		COMPILE_FLAGS ${_target_cflags}
	)

	ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
		DEPENDS	${_pch_output_to_use}
	)

	ADD_DEPENDENCIES(${_targetName} pch_Generate_${_targetName} )

ENDMACRO(ADD_PRECOMPILED_HEADER_TO_TARGET)

MACRO(ADD_PRECOMPILED_HEADER _targetName _inputh _inputcpp)

	IF(WITH_PCH)
		SET(_PCH_current_target ${_targetName})

		IF(NOT CMAKE_BUILD_TYPE)
			MESSAGE(FATAL_ERROR
				"This is the ADD_PRECOMPILED_HEADER macro. "
				"You must set CMAKE_BUILD_TYPE!"
			)
		ENDIF(NOT CMAKE_BUILD_TYPE)

		IF( "${ARGN}" STREQUAL "0")
			SET(_dowarn 0)
		ELSE( "${ARGN}" STREQUAL "0")
			SET(_dowarn 1)
		ENDIF("${ARGN}" STREQUAL "0")

		GET_FILENAME_COMPONENT(_name ${_inputh} NAME)
		GET_FILENAME_COMPONENT(_path ${_inputh} PATH)
		GET_PRECOMPILED_HEADER_OUTPUT( ${_targetName} ${_inputh} _output)

		GET_FILENAME_COMPONENT(_outdir ${_output} PATH )

		GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)

		# always build static library because it doesn't need linking
		ADD_LIBRARY(${_targetName}_pch_dephelp STATIC ${_inputcpp})

		FILE(MAKE_DIRECTORY ${_outdir})

		_PCH_GET_COMPILE_FLAGS(_compile_FLAGS)

		#MESSAGE("_compile_FLAGS: ${_compile_FLAGS}")
		#message("COMMAND ${CMAKE_CXX_COMPILER}	${_compile_FLAGS} -x c++-header -o ${_output} ${_input}")
		SET_SOURCE_FILES_PROPERTIES(${CMAKE_CURRENT_BINARY_DIR}/${_name} PROPERTIES GENERATED 1)
		ADD_CUSTOM_COMMAND(
			OUTPUT	${CMAKE_CURRENT_BINARY_DIR}/${_name}
			COMMAND ${CMAKE_COMMAND} -E copy  ${_inputh} ${CMAKE_CURRENT_BINARY_DIR}/${_name} # ensure same directory! Required by gcc
			DEPENDS ${_inputh}
			)

		#message("_command  ${_input} ${_output}")
		_PCH_GET_COMPILE_COMMAND(_command  ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_output})

		#message(${_input} )
		#message("_output ${_output}")

		ADD_CUSTOM_COMMAND(
			OUTPUT ${_output}
			COMMAND ${_command}
			DEPENDS ${_inputh}   ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_targetName}_pch_dephelp
		)

		ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_inputh}  ${_output} ${_dowarn})
	ENDIF(WITH_PCH)

ENDMACRO(ADD_PRECOMPILED_HEADER)

MACRO(ADD_NATIVE_PRECOMPILED_HEADER _targetName _inputh _inputcpp)

	IF(WITH_PCH)
		IF( "${ARGN}" STREQUAL "0")
			SET(_dowarn 0)
		ELSE( "${ARGN}" STREQUAL "0")
			SET(_dowarn 1)
		ENDIF("${ARGN}" STREQUAL "0")

		if(CMAKE_GENERATOR MATCHES Visual*)
			# Auto include the precompile (useful for moc processing, since the use of
			# precompiled is specified at the target level
			# and I don't want to specifiy /F- for each moc/res/ui generated files (using Qt)

			GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
			if (${oldProps} MATCHES NOTFOUND)
				SET(oldProps "")
			endif(${oldProps} MATCHES NOTFOUND)

			SET(newProperties "${oldProps} /Yu\"${_inputh}\" /FI\"${_inputh}\"")
			SET_TARGET_PROPERTIES(${_targetName} PROPERTIES COMPILE_FLAGS "${newProperties}")

			#also inlude ${oldProps} to have the same compile options
			SET_SOURCE_FILES_PROPERTIES(${_inputcpp} PROPERTIES COMPILE_FLAGS "${oldProps} /Yc\"${_inputh}\"")

		else(CMAKE_GENERATOR MATCHES Visual*)

			if (CMAKE_GENERATOR MATCHES Xcode)
				# For Xcode, cmake needs my patch to process
				# GCC_PREFIX_HEADER and GCC_PRECOMPILE_PREFIX_HEADER as target properties

				GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
				if (${oldProps} MATCHES NOTFOUND)
					SET(oldProps "")
				endif(${oldProps} MATCHES NOTFOUND)

				# When buiding out of the tree, precompiled may not be located
				# Use full path instead.
				GET_FILENAME_COMPONENT(fullPath ${_inputh} ABSOLUTE)

				SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${fullPath}")
				SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")

			else (CMAKE_GENERATOR MATCHES Xcode)

				#Fallback to the "old" precompiled suppport
				ADD_PRECOMPILED_HEADER(${_targetName} ${_inputh} ${_inputcpp} ${_dowarn})
			endif(CMAKE_GENERATOR MATCHES Xcode)
		endif(CMAKE_GENERATOR MATCHES Visual*)
	ENDIF(WITH_PCH)

ENDMACRO(ADD_NATIVE_PRECOMPILED_HEADER)