1 # taken from http://public.kitware.com/Bug/view.php?id=1260 and slightly adjusted
3 # - Try to find precompiled headers support for GCC 3.4 and 4.x
4 # Once done this will define:
10 # ADD_PRECOMPILED_HEADER _targetName _input _dowarn
11 # ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use _dowarn
12 # ADD_NATIVE_PRECOMPILED_HEADER _targetName _input _dowarn
13 # GET_NATIVE_PRECOMPILED_HEADER _targetName _input
15 IF(CMAKE_COMPILER_IS_GNUCXX)
19 ARGS ${CMAKE_CXX_COMPILER_ARG1} -dumpversion
20 OUTPUT_VARIABLE gcc_compiler_version)
21 #MESSAGE("GCC Version: ${gcc_compiler_version}")
22 IF(gcc_compiler_version VERSION_GREATER "4.2.-1")
23 SET(PCHSupport_FOUND TRUE)
26 SET(_PCH_include_prefix "-I")
27 SET(_PCH_isystem_prefix "-isystem")
28 SET(_PCH_define_prefix "-D")
30 ELSEIF(CMAKE_GENERATOR MATCHES "^Visual.*$")
31 SET(PCHSupport_FOUND TRUE)
32 SET(_PCH_include_prefix "/I")
33 SET(_PCH_isystem_prefix "/I")
34 SET(_PCH_define_prefix "/D")
36 SET(PCHSupport_FOUND FALSE)
39 MACRO(_PCH_GET_COMPILE_FLAGS _out_compile_flags)
41 STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name)
42 SET(${_out_compile_flags} ${${_flags_var_name}} )
44 IF(CMAKE_COMPILER_IS_GNUCXX)
46 GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)
47 IF(${_targetType} STREQUAL SHARED_LIBRARY AND NOT WIN32)
48 LIST(APPEND ${_out_compile_flags} "-fPIC")
51 GET_TARGET_PROPERTY(_target_definitions ${_PCH_current_target} COMPILE_DEFINITIONS)
52 if(_target_definitions)
53 foreach(_def ${_target_definitions})
54 LIST(APPEND ${_out_compile_flags} "-D${_def}")
59 ## TODO ... ? or does it work out of the box
62 GET_DIRECTORY_PROPERTY(DIRINC INCLUDE_DIRECTORIES )
63 FOREACH(item ${DIRINC})
64 if(item MATCHES "^${OpenCV_SOURCE_DIR}/modules/")
65 LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}\"${item}\"")
67 LIST(APPEND ${_out_compile_flags} "${_PCH_isystem_prefix}\"${item}\"")
71 GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS)
72 GET_DIRECTORY_PROPERTY(_global_definitions DIRECTORY ${OpenCV_SOURCE_DIR} DEFINITIONS)
73 #MESSAGE("_directory_flags ${_directory_flags} ${_global_definitions}" )
74 LIST(APPEND ${_out_compile_flags} ${_directory_flags})
75 LIST(APPEND ${_out_compile_flags} ${_global_definitions})
76 LIST(APPEND ${_out_compile_flags} ${CMAKE_CXX_FLAGS})
78 SEPARATE_ARGUMENTS(${_out_compile_flags})
80 ENDMACRO(_PCH_GET_COMPILE_FLAGS)
83 MACRO(_PCH_WRITE_PCHDEP_CXX _targetName _include_file _dephelp)
85 SET(${_dephelp} ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch_dephelp.cxx)
88 OUTPUT "${${_dephelp}}"
89 COMMAND ${CMAKE_COMMAND} -E echo "#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
90 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction();" >> "${${_dephelp}}"
91 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction()" >> "${${_dephelp}}"
92 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
93 COMMAND ${CMAKE_COMMAND} -E echo " return 0;" >> "${${_dephelp}}"
94 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
95 DEPENDS "${_include_file}"
99 OUTPUT "${${_dephelp}}"
100 COMMAND ${CMAKE_COMMAND} -E echo "\\#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
101 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)\\;" >> "${${_dephelp}}"
102 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)" >> "${${_dephelp}}"
103 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
104 COMMAND ${CMAKE_COMMAND} -E echo " \\return 0\\;" >> "${${_dephelp}}"
105 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
106 DEPENDS "${_include_file}"
110 ENDMACRO(_PCH_WRITE_PCHDEP_CXX )
112 MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)
114 FILE(TO_NATIVE_PATH ${_input} _native_input)
115 FILE(TO_NATIVE_PATH ${_output} _native_output)
117 IF(CMAKE_COMPILER_IS_GNUCXX)
118 IF(CMAKE_CXX_COMPILER_ARG1)
119 # remove leading space in compiler argument
120 STRING(REGEX REPLACE "^ +" "" pchsupport_compiler_cxx_arg1 ${CMAKE_CXX_COMPILER_ARG1})
123 ${CMAKE_CXX_COMPILER} ${pchsupport_compiler_cxx_arg1} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
125 ELSE(CMAKE_CXX_COMPILER_ARG1)
127 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
129 ENDIF(CMAKE_CXX_COMPILER_ARG1)
130 ELSE(CMAKE_COMPILER_IS_GNUCXX)
132 SET(_dummy_str "#include <${_input}>")
133 FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pch_dummy.cpp ${_dummy_str})
136 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} /c /Fp${_native_output} /Yc${_native_input} pch_dummy.cpp
140 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
142 ENDMACRO(_PCH_GET_COMPILE_COMMAND )
145 MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags _header_name _pch_path _dowarn )
147 FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)
149 IF(CMAKE_COMPILER_IS_GNUCXX)
150 # for use with distcc and gcc >4.0.1 if preprocessed files are accessible
151 # on all remote machines set
152 # PCH_ADDITIONAL_COMPILER_FLAGS to -fpch-preprocess
153 # if you want warnings for invalid header files (which is very inconvenient
154 # if you have different versions of the headers for different build types
155 # you may set _pch_dowarn
157 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" -Winvalid-pch " )
159 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" " )
162 ELSE(CMAKE_COMPILER_IS_GNUCXX)
164 set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )
166 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
168 ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )
171 MACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input _output)
173 GET_FILENAME_COMPONENT(_name ${_input} NAME)
174 GET_FILENAME_COMPONENT(_path ${_input} PATH)
175 SET(${_output} "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch/${_targetName}_${CMAKE_BUILD_TYPE}.gch")
177 ENDMACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input)
180 MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
182 # to do: test whether compiler flags match between target _targetName
183 # and _pch_output_to_use
184 GET_FILENAME_COMPONENT(_name ${_input} NAME)
186 IF(ARGN STREQUAL "0")
192 _PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
193 #MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
195 GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
196 FOREACH(src ${_sources})
197 if(NOT "${src}" MATCHES "\\.mm$")
198 get_source_file_property(_flags "${src}" COMPILE_FLAGS)
200 set(_flags "${_flags} ${_target_cflags}")
202 set(_flags "${_target_cflags}")
205 set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_flags}")
209 ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
210 DEPENDS ${_pch_output_to_use}
213 ADD_DEPENDENCIES(${_targetName} pch_Generate_${_targetName} )
215 ENDMACRO(ADD_PRECOMPILED_HEADER_TO_TARGET)
217 MACRO(ADD_PRECOMPILED_HEADER _targetName _input)
219 SET(_PCH_current_target ${_targetName})
221 IF(NOT CMAKE_BUILD_TYPE)
223 "This is the ADD_PRECOMPILED_HEADER macro. "
224 "You must set CMAKE_BUILD_TYPE!"
228 IF(ARGN STREQUAL "0")
234 GET_FILENAME_COMPONENT(_name ${_input} NAME)
235 GET_FILENAME_COMPONENT(_path ${_input} PATH)
236 GET_PRECOMPILED_HEADER_OUTPUT( ${_targetName} ${_input} _output)
238 _PCH_WRITE_PCHDEP_CXX(${_targetName} "${_input}" _pch_dephelp_cxx)
240 ADD_LIBRARY(${_targetName}_pch_dephelp STATIC "${_pch_dephelp_cxx}" "${_input}" )
242 set_target_properties(${_targetName}_pch_dephelp PROPERTIES
243 DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
244 ARCHIVE_OUTPUT_DIRECTORY "${LIBRARY_OUTPUT_PATH}"
247 _PCH_GET_COMPILE_FLAGS(_compile_FLAGS)
249 get_target_property(type ${_targetName} TYPE)
250 if(type STREQUAL "SHARED_LIBRARY")
251 get_target_property(__DEFINES ${_targetName} DEFINE_SYMBOL)
252 if(NOT __DEFINES MATCHES __DEFINES-NOTFOUND)
253 list(APPEND _compile_FLAGS "${_PCH_define_prefix}${__DEFINES}")
257 #MESSAGE("_compile_FLAGS: ${_compile_FLAGS}")
258 #message("COMMAND ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}")
261 OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
262 COMMAND ${CMAKE_COMMAND} -E copy "${_input}" "${CMAKE_CURRENT_BINARY_DIR}/${_name}" # ensure same directory! Required by gcc
266 #message("_command ${_input} ${_output}")
267 _PCH_GET_COMPILE_COMMAND(_command ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_output} )
269 GET_FILENAME_COMPONENT(_outdir ${_output} PATH)
272 COMMAND ${CMAKE_COMMAND} -E make_directory "${_outdir}"
275 DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
276 DEPENDS ${_targetName}_pch_dephelp
279 ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_input} ${_output} ${_dowarn})
281 ENDMACRO(ADD_PRECOMPILED_HEADER)
284 # Generates the use of precompiled in a target,
285 # without using depency targets (2 extra for each target)
286 # Using Visual, must also add ${_targetName}_pch to sources
287 # Not needed by Xcode
289 MACRO(GET_NATIVE_PRECOMPILED_HEADER _targetName _input)
291 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
292 set(_dummy_str "#include \"${_input}\"\n")
294 set(${_targetName}_pch ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch.cpp)
295 if(EXISTS ${${_targetName}_pch})
296 # Check if contents is the same, if not rewrite
299 FILE(WRITE ${${_targetName}_pch} ${_dummy_str})
303 ENDMACRO(GET_NATIVE_PRECOMPILED_HEADER)
306 MACRO(ADD_NATIVE_PRECOMPILED_HEADER _targetName _input)
308 IF(ARGN STREQUAL "0")
314 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
316 # Auto include the precompile (useful for moc processing, since the use of
317 # precompiled is specified at the target level
318 # and I don't want to specifiy /F- for each moc/res/ui generated files (using Qt)
320 GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
321 if (oldProps MATCHES NOTFOUND)
325 SET(newProperties "${oldProps} /Yu\"${_input}\" /FI\"${_input}\"")
326 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES COMPILE_FLAGS "${newProperties}")
328 #also inlude ${oldProps} to have the same compile options
329 SET_SOURCE_FILES_PROPERTIES(${${_targetName}_pch} PROPERTIES COMPILE_FLAGS "${oldProps} /Yc\"${_input}\"")
331 elseif (CMAKE_GENERATOR MATCHES Xcode)
333 # For Xcode, cmake needs my patch to process
334 # GCC_PREFIX_HEADER and GCC_PRECOMPILE_PREFIX_HEADER as target properties
336 # When buiding out of the tree, precompiled may not be located
337 # Use full path instead.
338 GET_FILENAME_COMPONENT(fullPath ${_input} ABSOLUTE)
340 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${fullPath}")
341 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
345 #Fallback to the "old" precompiled suppport
346 #ADD_PRECOMPILED_HEADER(${_targetName} ${_input} ${_dowarn})
350 ENDMACRO(ADD_NATIVE_PRECOMPILED_HEADER)
352 macro(ocv_add_precompiled_header_to_target the_target pch_header)
353 if(PCHSupport_FOUND AND ENABLE_PRECOMPILED_HEADERS AND EXISTS "${pch_header}")
354 if(CMAKE_GENERATOR MATCHES "^Visual" OR CMAKE_GENERATOR MATCHES Xcode)
355 add_native_precompiled_header(${the_target} ${pch_header})
356 elseif(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_GENERATOR MATCHES "Makefiles|Ninja")
357 add_precompiled_header(${the_target} ${pch_header})