Am Mittwoch, den 20.12.2006, 17:53 +0100 schrieb frederic heem:
> Hi,
> Is there a nice way to find out if a target is using -fPIC ?
> Indeed, this information is needed for generating compiled header.
> At the moment, a kludge is to use the following code:
>
> #If the target is a shared library, add -fPIC to compile
> GET_TARGET_PROPERTY(_targetType ${_targetName} TYPE)
> IF(${_targetType} STREQUAL SHARED_LIBRARY)
> SET(_compile_FLAGS "${_compile_FLAGS} -fPIC")
> ENDIF(${_targetType} STREQUAL SHARED_LIBRARY)
>
> This works but is not a proper solution, one shall not know in which
> case -fPIC is used or not.
> Thanks,
> Frederic Heem
I ran into this problem and your solutions works like a charm.
I also worked on msvc support(see attached file), but it only work if
CMAKE_BUILD_TYPE equals "Release", since /Fd wants to add debugging
informations and fails due to inconsitent pdb files. If someone know's
more about this issue, please give me a hint.
merry Christmas, Maik
# - Try to find precompiled headers support for GCC 3.4 and 4.x
# Once done this will define:
#
# Variable:
# PCHSupport_FOUND
#
# Macro:
# ADD_PRECOMPILED_HEADER
IF(CMAKE_COMPILER_IS_GNUCXX)
EXEC_PROGRAM(
${CMAKE_CXX_COMPILER}
ARGS --version
OUTPUT_VARIABLE _compiler_output)
STRING(REGEX REPLACE ".* ([0-9]\\.[0-9]\\.[0-9]) .*" "\\1"
gcc_compiler_version ${_compiler_output})
#MESSAGE("GCC Version: ${gcc_compiler_version}")
IF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")
SET(PCHSupport_FOUND TRUE)
ELSE(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")
IF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]")
SET(PCHSupport_FOUND TRUE)
ENDIF(gcc_compiler_version MATCHES "3\\.4\\.[0-9]")
ENDIF(gcc_compiler_version MATCHES "4\\.[0-9]\\.[0-9]")
SET(_PCH_include_prefix "-I")
ELSE(CMAKE_COMPILER_IS_GNUCXX)
SET(PCHSupport_FOUND TRUE) # for experimental msvc support
SET(_PCH_include_prefix "/I")
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
MACRO(_PCH_GET_COMPILE_FLAGS _out_compile_flags)
STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name)
SET(_compile_FLAGS ${${_flags_var_name}} )
IF(CMAKE_COMPILER_IS_GNUCXX)
GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)
IF(${_targetType} STREQUAL SHARED_LIBRARY)
LIST(APPEND _compile_FLAGS "${_compile_FLAGS} -fPIC")
ENDIF(${_targetType} STREQUAL SHARED_LIBRARY)
ELSE(CMAKE_COMPILER_IS_GNUCXX)
## TODO ... ? or does it work out of the box
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
FOREACH(item ${_directory_flags})
LIST(APPEND _compile_FLAGS "${_PCH_include_prefix}${item}")
ENDFOREACH(item)
GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS)
LIST(APPEND _compile_FLAGS ${_directory_flags})
LIST(APPEND _compile_FLAGS ${CMAKE_CXX_FLAGS} )
SEPARATE_ARGUMENTS(_compile_FLAGS)
ENDMACRO(_PCH_GET_COMPILE_FLAGS)
MACRO(_PCH_TEST_PATH _path )
GET_DIRECTORY_PROPERTY(_directory_flags INCLUDE_DIRECTORIES)
SET(_CMAKE_CURRENT_BINARY_DIR_included_before_path FALSE)
FOREACH(item ${_directory_flags})
IF(${item} STREQUAL ${_path} AND NOT
_CMAKE_CURRENT_BINARY_DIR_included_before_path )
MESSAGE(FATAL_ERROR
"This is the ADD_PRECOMPILED_HEADER macro. "
"CMAKE_CURREN_BINARY_DIR has to mentioned at
INCLUDE_DIRECTORIES's argument list before :${_path}:, where ${_name} is
located"
)
ENDIF(${item} STREQUAL ${_path} AND NOT
_CMAKE_CURRENT_BINARY_DIR_included_before_path )
IF(${item} STREQUAL ${CMAKE_CURRENT_BINARY_DIR})
SET(_CMAKE_CURRENT_BINARY_DIR_included_before_path TRUE)
ENDIF(${item} STREQUAL ${CMAKE_CURRENT_BINARY_DIR})
ENDFOREACH(item)
ENDMACRO(_PCH_TEST_PATH)
MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)
FILE(TO_NATIVE_PATH ${_input} _native_input)
FILE(TO_NATIVE_PATH ${_output} _native_output)
IF(CMAKE_COMPILER_IS_GNUCXX)
SET(${out_command}
${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header
-o ${_output} ${_input}
)
ELSE(CMAKE_COMPILER_IS_GNUCXX)
SET(_dummy_str "#include <${_input}>")
FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pch_dummy.cpp
${_dummy_str})
SET(${out_command}
${CMAKE_CXX_COMPILER} ${_compile_FLAGS} /c
/Fp${_native_output} /Yc${_native_input} pch_dummy.cpp
)
#/out:${_output}
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
ENDMACRO(_PCH_GET_COMPILE_COMMAND )
MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags _header_name _pch_path )
FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)
message(${_native_pch_path})
IF(CMAKE_COMPILER_IS_GNUCXX)
set(${_cflags} "-include ${_header_name} -Winvalid-pch" )
ELSE(CMAKE_COMPILER_IS_GNUCXX)
set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )
ENDIF(CMAKE_COMPILER_IS_GNUCXX)
ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )
MACRO(ADD_PRECOMPILED_HEADER _targetName _input )
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)
GET_FILENAME_COMPONENT(_name ${_input} NAME)
GET_FILENAME_COMPONENT(_path ${_input} PATH)
SET(_outdir "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch")
SET(_output "${_outdir}/${CMAKE_BUILD_TYPE}.c++")
ADD_CUSTOM_COMMAND(
OUTPUT ${_outdir}
COMMAND mkdir ${_outdir} # TODO: {CMAKE_COMMAND} -E ...
!doesn't work in win32
)
_PCH_TEST_PATH(_path)
_PCH_GET_COMPILE_FLAGS(_compile_FLAGS)
#MESSAGE("_compiler_FLAGS: ${_compiler_FLAGS}")
message(${_compile_FLAGS} )
#message("COMMAND ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header
-o ${_output} ${_input}")
ADD_CUSTOM_COMMAND(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${_name}
COMMAND ${CMAKE_COMMAND} -E copy ${_input}
${CMAKE_CURRENT_BINARY_DIR}/${_name} # ensure same directory! Required by gcc
)
#message("_command ${_input} ${_output}")
_PCH_GET_COMPILE_COMMAND(_command ${_input} ${_output} )
#message(${_input} )
message("${_command}")
ADD_CUSTOM_COMMAND(
OUTPUT ${_output}
COMMAND ${_command}
DEPENDS ${_input} ${_outdir} ${CMAKE_CURRENT_BINARY_DIR}/${_name}
)
ADD_CUSTOM_TARGET(${_targetName}_gch
DEPENDS ${_output}
)
ADD_DEPENDENCIES(${_targetName} ${_targetName}_gch )
_PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_output})
#message("${_target_cflags}")
SET_TARGET_PROPERTIES(${_targetName}
PROPERTIES
COMPILE_FLAGS ${_target_cflags}
)
ENDMACRO(ADD_PRECOMPILED_HEADER)
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