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_target_property(DIRINC ${_PCH_current_target} INCLUDE_DIRECTORIES )
72 FOREACH(item ${DIRINC})
73 if(item MATCHES "^${OpenCV_SOURCE_DIR}/modules/")
74 LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}\"${item}\"")
76 LIST(APPEND ${_out_compile_flags} "${_PCH_isystem_prefix}\"${item}\"")
80 GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS)
81 GET_DIRECTORY_PROPERTY(_global_definitions DIRECTORY ${OpenCV_SOURCE_DIR} DEFINITIONS)
82 #MESSAGE("_directory_flags ${_directory_flags} ${_global_definitions}" )
83 LIST(APPEND ${_out_compile_flags} ${_directory_flags})
84 LIST(APPEND ${_out_compile_flags} ${_global_definitions})
85 LIST(APPEND ${_out_compile_flags} ${CMAKE_CXX_FLAGS})
87 SEPARATE_ARGUMENTS(${_out_compile_flags})
89 ENDMACRO(_PCH_GET_COMPILE_FLAGS)
92 MACRO(_PCH_WRITE_PCHDEP_CXX _targetName _include_file _dephelp)
94 SET(${_dephelp} ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch_dephelp.cxx)
97 OUTPUT "${${_dephelp}}"
98 COMMAND ${CMAKE_COMMAND} -E echo "#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
99 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction();" >> "${${_dephelp}}"
100 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction()" >> "${${_dephelp}}"
101 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
102 COMMAND ${CMAKE_COMMAND} -E echo " return 0;" >> "${${_dephelp}}"
103 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
104 DEPENDS "${_include_file}"
108 OUTPUT "${${_dephelp}}"
109 COMMAND ${CMAKE_COMMAND} -E echo "\\#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
110 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)\\;" >> "${${_dephelp}}"
111 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)" >> "${${_dephelp}}"
112 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
113 COMMAND ${CMAKE_COMMAND} -E echo " \\return 0\\;" >> "${${_dephelp}}"
114 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
115 DEPENDS "${_include_file}"
119 ENDMACRO(_PCH_WRITE_PCHDEP_CXX )
121 MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)
123 FILE(TO_NATIVE_PATH ${_input} _native_input)
124 FILE(TO_NATIVE_PATH ${_output} _native_output)
126 IF(CMAKE_COMPILER_IS_GNUCXX)
127 IF(CMAKE_CXX_COMPILER_ARG1)
128 # remove leading space in compiler argument
129 STRING(REGEX REPLACE "^ +" "" pchsupport_compiler_cxx_arg1 ${CMAKE_CXX_COMPILER_ARG1})
132 ${CMAKE_CXX_COMPILER} ${pchsupport_compiler_cxx_arg1} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
134 ELSE(CMAKE_CXX_COMPILER_ARG1)
136 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
138 ENDIF(CMAKE_CXX_COMPILER_ARG1)
139 ELSE(CMAKE_COMPILER_IS_GNUCXX)
141 SET(_dummy_str "#include <${_input}>")
142 FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pch_dummy.cpp ${_dummy_str})
145 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} /c /Fp${_native_output} /Yc${_native_input} pch_dummy.cpp
149 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
151 ENDMACRO(_PCH_GET_COMPILE_COMMAND )
154 MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags _header_name _pch_path _dowarn )
156 FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)
158 IF(CMAKE_COMPILER_IS_GNUCXX)
159 # for use with distcc and gcc >4.0.1 if preprocessed files are accessible
160 # on all remote machines set
161 # PCH_ADDITIONAL_COMPILER_FLAGS to -fpch-preprocess
162 # if you want warnings for invalid header files (which is very inconvenient
163 # if you have different versions of the headers for different build types
164 # you may set _pch_dowarn
166 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" -Winvalid-pch " )
168 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" " )
171 ELSE(CMAKE_COMPILER_IS_GNUCXX)
173 set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )
175 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
177 ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )
180 MACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input _output)
182 GET_FILENAME_COMPONENT(_name ${_input} NAME)
183 GET_FILENAME_COMPONENT(_path ${_input} PATH)
184 SET(${_output} "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch/${_targetName}_${CMAKE_BUILD_TYPE}.gch")
186 ENDMACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input)
189 MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
191 # to do: test whether compiler flags match between target _targetName
192 # and _pch_output_to_use
193 GET_FILENAME_COMPONENT(_name ${_input} NAME)
195 IF(ARGN STREQUAL "0")
201 _PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
202 #MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
204 GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
205 FOREACH(src ${_sources})
206 if(NOT "${src}" MATCHES "\\.mm$")
207 get_source_file_property(_flags "${src}" COMPILE_FLAGS)
209 set(_flags "${_flags} ${_target_cflags}")
211 set(_flags "${_target_cflags}")
214 set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_flags}")
218 ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
219 DEPENDS ${_pch_output_to_use}
222 ADD_DEPENDENCIES(${_targetName} pch_Generate_${_targetName} )
224 ENDMACRO(ADD_PRECOMPILED_HEADER_TO_TARGET)
226 MACRO(ADD_PRECOMPILED_HEADER _targetName _input)
228 SET(_PCH_current_target ${_targetName})
230 IF(NOT CMAKE_BUILD_TYPE)
232 "This is the ADD_PRECOMPILED_HEADER macro. "
233 "You must set CMAKE_BUILD_TYPE!"
237 IF(ARGN STREQUAL "0")
243 GET_FILENAME_COMPONENT(_name ${_input} NAME)
244 GET_FILENAME_COMPONENT(_path ${_input} PATH)
245 GET_PRECOMPILED_HEADER_OUTPUT( ${_targetName} ${_input} _output)
247 _PCH_WRITE_PCHDEP_CXX(${_targetName} "${_input}" _pch_dephelp_cxx)
249 ADD_LIBRARY(${_targetName}_pch_dephelp STATIC "${_pch_dephelp_cxx}" "${_input}" )
251 set_target_properties(${_targetName}_pch_dephelp PROPERTIES
252 DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
253 ARCHIVE_OUTPUT_DIRECTORY "${LIBRARY_OUTPUT_PATH}"
256 _PCH_GET_COMPILE_FLAGS(_compile_FLAGS)
258 get_target_property(type ${_targetName} TYPE)
259 if(type STREQUAL "SHARED_LIBRARY")
260 get_target_property(__DEFINES ${_targetName} DEFINE_SYMBOL)
261 if(NOT __DEFINES MATCHES __DEFINES-NOTFOUND)
262 list(APPEND _compile_FLAGS "${_PCH_define_prefix}${__DEFINES}")
266 get_target_property(DIRINC ${_targetName} INCLUDE_DIRECTORIES)
267 set_target_properties(${_targetName}_pch_dephelp PROPERTIES INCLUDE_DIRECTORIES "${DIRINC}")
269 #MESSAGE("_compile_FLAGS: ${_compile_FLAGS}")
270 #message("COMMAND ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}")
273 OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
274 COMMAND ${CMAKE_COMMAND} -E copy "${_input}" "${CMAKE_CURRENT_BINARY_DIR}/${_name}" # ensure same directory! Required by gcc
278 #message("_command ${_input} ${_output}")
279 _PCH_GET_COMPILE_COMMAND(_command ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_output} )
281 GET_FILENAME_COMPONENT(_outdir ${_output} PATH)
284 COMMAND ${CMAKE_COMMAND} -E make_directory "${_outdir}"
287 DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
288 DEPENDS ${_targetName}_pch_dephelp
291 ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_input} ${_output} ${_dowarn})
293 ENDMACRO(ADD_PRECOMPILED_HEADER)
296 # Generates the use of precompiled in a target,
297 # without using depency targets (2 extra for each target)
298 # Using Visual, must also add ${_targetName}_pch to sources
299 # Not needed by Xcode
301 MACRO(GET_NATIVE_PRECOMPILED_HEADER _targetName _input)
303 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
304 set(_dummy_str "#include \"${_input}\"\n")
306 set(${_targetName}_pch ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch.cpp)
307 if(EXISTS ${${_targetName}_pch})
308 # Check if contents is the same, if not rewrite
311 FILE(WRITE ${${_targetName}_pch} ${_dummy_str})
315 ENDMACRO(GET_NATIVE_PRECOMPILED_HEADER)
318 MACRO(ADD_NATIVE_PRECOMPILED_HEADER _targetName _input)
320 IF(ARGN STREQUAL "0")
326 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
328 # Auto include the precompile (useful for moc processing, since the use of
329 # precompiled is specified at the target level
330 # and I don't want to specifiy /F- for each moc/res/ui generated files (using Qt)
332 GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
333 if (oldProps MATCHES NOTFOUND)
337 SET(newProperties "${oldProps} /Yu\"${_input}\" /FI\"${_input}\"")
338 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES COMPILE_FLAGS "${newProperties}")
340 #also inlude ${oldProps} to have the same compile options
341 SET_SOURCE_FILES_PROPERTIES(${${_targetName}_pch} PROPERTIES COMPILE_FLAGS "${oldProps} /Yc\"${_input}\"")
343 elseif (CMAKE_GENERATOR MATCHES Xcode)
345 # For Xcode, cmake needs my patch to process
346 # GCC_PREFIX_HEADER and GCC_PRECOMPILE_PREFIX_HEADER as target properties
348 # When buiding out of the tree, precompiled may not be located
349 # Use full path instead.
350 GET_FILENAME_COMPONENT(fullPath ${_input} ABSOLUTE)
352 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${fullPath}")
353 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
357 #Fallback to the "old" precompiled suppport
358 #ADD_PRECOMPILED_HEADER(${_targetName} ${_input} ${_dowarn})
362 ENDMACRO(ADD_NATIVE_PRECOMPILED_HEADER)
364 macro(ocv_add_precompiled_header_to_target the_target pch_header)
365 if(PCHSupport_FOUND AND ENABLE_PRECOMPILED_HEADERS AND EXISTS "${pch_header}")
366 if(CMAKE_GENERATOR MATCHES "^Visual" OR CMAKE_GENERATOR MATCHES Xcode)
367 add_native_precompiled_header(${the_target} ${pch_header})
368 elseif(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_GENERATOR MATCHES "Makefiles|Ninja")
369 add_precompiled_header(${the_target} ${pch_header})