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: ${gcc_compiler_version}")
22 IF(gcc_compiler_version VERSION_GREATER "4.2.-1")
23 SET(PCHSupport_FOUND TRUE)
26 SET(_PCH_include_prefix "-I")
27 SET(_PCH_isystem_prefix "-isystem")
29 ELSEIF(CMAKE_GENERATOR MATCHES "^Visual.*$")
30 SET(PCHSupport_FOUND TRUE)
31 SET(_PCH_include_prefix "/I")
32 SET(_PCH_isystem_prefix "/I")
34 SET(PCHSupport_FOUND FALSE)
37 MACRO(_PCH_GET_COMPILE_FLAGS _out_compile_flags)
39 STRING(TOUPPER "CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE}" _flags_var_name)
40 SET(${_out_compile_flags} ${${_flags_var_name}} )
42 IF(CMAKE_COMPILER_IS_GNUCXX)
44 GET_TARGET_PROPERTY(_targetType ${_PCH_current_target} TYPE)
45 IF(${_targetType} STREQUAL SHARED_LIBRARY AND NOT WIN32)
46 LIST(APPEND ${_out_compile_flags} "-fPIC")
50 ## TODO ... ? or does it work out of the box
53 GET_DIRECTORY_PROPERTY(DIRINC INCLUDE_DIRECTORIES )
54 FOREACH(item ${DIRINC})
55 if(item MATCHES "^${OpenCV_SOURCE_DIR}/modules/")
56 LIST(APPEND ${_out_compile_flags} "${_PCH_include_prefix}\"${item}\"")
58 LIST(APPEND ${_out_compile_flags} "${_PCH_isystem_prefix}\"${item}\"")
62 GET_DIRECTORY_PROPERTY(_directory_flags DEFINITIONS)
63 GET_DIRECTORY_PROPERTY(_global_definitions DIRECTORY ${OpenCV_SOURCE_DIR} DEFINITIONS)
64 #MESSAGE("_directory_flags ${_directory_flags} ${_global_definitions}" )
65 LIST(APPEND ${_out_compile_flags} ${_directory_flags})
66 LIST(APPEND ${_out_compile_flags} ${_global_definitions})
67 LIST(APPEND ${_out_compile_flags} ${CMAKE_CXX_FLAGS})
69 SEPARATE_ARGUMENTS(${_out_compile_flags})
71 ENDMACRO(_PCH_GET_COMPILE_FLAGS)
74 MACRO(_PCH_WRITE_PCHDEP_CXX _targetName _include_file _dephelp)
76 SET(${_dephelp} ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch_dephelp.cxx)
79 OUTPUT "${${_dephelp}}"
80 COMMAND ${CMAKE_COMMAND} -E echo "#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
81 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction();" >> "${${_dephelp}}"
82 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction()" >> "${${_dephelp}}"
83 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
84 COMMAND ${CMAKE_COMMAND} -E echo " return 0;" >> "${${_dephelp}}"
85 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
86 DEPENDS "${_include_file}"
90 OUTPUT "${${_dephelp}}"
91 COMMAND ${CMAKE_COMMAND} -E echo "\\#include \\\"${_include_file}\\\"" > "${${_dephelp}}"
92 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)\\;" >> "${${_dephelp}}"
93 COMMAND ${CMAKE_COMMAND} -E echo "int testfunction\\(\\)" >> "${${_dephelp}}"
94 COMMAND ${CMAKE_COMMAND} -E echo "{" >> "${${_dephelp}}"
95 COMMAND ${CMAKE_COMMAND} -E echo " \\return 0\\;" >> "${${_dephelp}}"
96 COMMAND ${CMAKE_COMMAND} -E echo "}" >> "${${_dephelp}}"
97 DEPENDS "${_include_file}"
101 ENDMACRO(_PCH_WRITE_PCHDEP_CXX )
103 MACRO(_PCH_GET_COMPILE_COMMAND out_command _input _output)
105 FILE(TO_NATIVE_PATH ${_input} _native_input)
106 FILE(TO_NATIVE_PATH ${_output} _native_output)
108 IF(CMAKE_COMPILER_IS_GNUCXX)
109 IF(CMAKE_CXX_COMPILER_ARG1)
110 # remove leading space in compiler argument
111 STRING(REGEX REPLACE "^ +" "" pchsupport_compiler_cxx_arg1 ${CMAKE_CXX_COMPILER_ARG1})
114 ${CMAKE_CXX_COMPILER} ${pchsupport_compiler_cxx_arg1} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
116 ELSE(CMAKE_CXX_COMPILER_ARG1)
118 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}
120 ENDIF(CMAKE_CXX_COMPILER_ARG1)
121 ELSE(CMAKE_COMPILER_IS_GNUCXX)
123 SET(_dummy_str "#include <${_input}>")
124 FILE(WRITE ${CMAKE_CURRENT_BINARY_DIR}/pch_dummy.cpp ${_dummy_str})
127 ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} /c /Fp${_native_output} /Yc${_native_input} pch_dummy.cpp
131 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
133 ENDMACRO(_PCH_GET_COMPILE_COMMAND )
136 MACRO(_PCH_GET_TARGET_COMPILE_FLAGS _cflags _header_name _pch_path _dowarn )
138 FILE(TO_NATIVE_PATH ${_pch_path} _native_pch_path)
140 IF(CMAKE_COMPILER_IS_GNUCXX)
141 # for use with distcc and gcc >4.0.1 if preprocessed files are accessible
142 # on all remote machines set
143 # PCH_ADDITIONAL_COMPILER_FLAGS to -fpch-preprocess
144 # if you want warnings for invalid header files (which is very inconvenient
145 # if you have different versions of the headers for different build types
146 # you may set _pch_dowarn
148 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" -Winvalid-pch " )
150 SET(${_cflags} "${PCH_ADDITIONAL_COMPILER_FLAGS} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_header_name}\" " )
153 ELSE(CMAKE_COMPILER_IS_GNUCXX)
155 set(${_cflags} "/Fp${_native_pch_path} /Yu${_header_name}" )
157 ENDIF(CMAKE_COMPILER_IS_GNUCXX)
159 ENDMACRO(_PCH_GET_TARGET_COMPILE_FLAGS )
162 MACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input _output)
164 GET_FILENAME_COMPONENT(_name ${_input} NAME)
165 GET_FILENAME_COMPONENT(_path ${_input} PATH)
166 SET(${_output} "${CMAKE_CURRENT_BINARY_DIR}/${_name}.gch/${_targetName}_${CMAKE_BUILD_TYPE}.gch")
168 ENDMACRO(GET_PRECOMPILED_HEADER_OUTPUT _targetName _input)
171 MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
173 # to do: test whether compiler flags match between target _targetName
174 # and _pch_output_to_use
175 GET_FILENAME_COMPONENT(_name ${_input} NAME)
177 IF(ARGN STREQUAL "0")
183 _PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
184 #MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
186 GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
187 FOREACH(src ${_sources})
188 if(NOT "${src}" MATCHES "\\.mm$")
189 get_source_file_property(_flags "${src}" COMPILE_FLAGS)
191 set(_flags "${_flags} ${_target_cflags}")
193 set(_flags "${_target_cflags}")
196 set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_flags}")
200 ADD_CUSTOM_TARGET(pch_Generate_${_targetName}
201 DEPENDS ${_pch_output_to_use}
204 ADD_DEPENDENCIES(${_targetName} pch_Generate_${_targetName} )
206 ENDMACRO(ADD_PRECOMPILED_HEADER_TO_TARGET)
208 MACRO(ADD_PRECOMPILED_HEADER _targetName _input)
210 SET(_PCH_current_target ${_targetName})
212 IF(NOT CMAKE_BUILD_TYPE)
214 "This is the ADD_PRECOMPILED_HEADER macro. "
215 "You must set CMAKE_BUILD_TYPE!"
219 IF(ARGN STREQUAL "0")
225 GET_FILENAME_COMPONENT(_name ${_input} NAME)
226 GET_FILENAME_COMPONENT(_path ${_input} PATH)
227 GET_PRECOMPILED_HEADER_OUTPUT( ${_targetName} ${_input} _output)
229 _PCH_WRITE_PCHDEP_CXX(${_targetName} "${_input}" _pch_dephelp_cxx)
231 ADD_LIBRARY(${_targetName}_pch_dephelp STATIC "${_pch_dephelp_cxx}" "${_input}" )
233 set_target_properties(${_targetName}_pch_dephelp PROPERTIES
234 DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
235 ARCHIVE_OUTPUT_DIRECTORY "${LIBRARY_OUTPUT_PATH}"
238 _PCH_GET_COMPILE_FLAGS(_compile_FLAGS)
240 #MESSAGE("_compile_FLAGS: ${_compile_FLAGS}")
241 #message("COMMAND ${CMAKE_CXX_COMPILER} ${_compile_FLAGS} -x c++-header -o ${_output} ${_input}")
244 OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
245 COMMAND ${CMAKE_COMMAND} -E copy "${_input}" "${CMAKE_CURRENT_BINARY_DIR}/${_name}" # ensure same directory! Required by gcc
249 #message("_command ${_input} ${_output}")
250 _PCH_GET_COMPILE_COMMAND(_command ${CMAKE_CURRENT_BINARY_DIR}/${_name} ${_output} )
252 GET_FILENAME_COMPONENT(_outdir ${_output} PATH)
255 COMMAND ${CMAKE_COMMAND} -E make_directory "${_outdir}"
258 DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/${_name}"
259 DEPENDS ${_targetName}_pch_dephelp
262 ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_input} ${_output} ${_dowarn})
264 ENDMACRO(ADD_PRECOMPILED_HEADER)
267 # Generates the use of precompiled in a target,
268 # without using depency targets (2 extra for each target)
269 # Using Visual, must also add ${_targetName}_pch to sources
270 # Not needed by Xcode
272 MACRO(GET_NATIVE_PRECOMPILED_HEADER _targetName _input)
274 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
275 SET(_dummy_str "#include \"${_input}\"\n"
276 "// This is required to suppress LNK4221. Very annoying.\n"
277 "void *g_${_targetName}Dummy = 0\;\n")
279 # Use of cxx extension for generated files (as Qt does)
280 SET(${_targetName}_pch ${CMAKE_CURRENT_BINARY_DIR}/${_targetName}_pch.cxx)
281 if(EXISTS ${${_targetName}_pch})
282 # Check if contents is the same, if not rewrite
285 FILE(WRITE ${${_targetName}_pch} ${_dummy_str})
289 ENDMACRO(GET_NATIVE_PRECOMPILED_HEADER)
292 MACRO(ADD_NATIVE_PRECOMPILED_HEADER _targetName _input)
294 IF(ARGN STREQUAL "0")
300 if(CMAKE_GENERATOR MATCHES "^Visual.*$")
302 # Auto include the precompile (useful for moc processing, since the use of
303 # precompiled is specified at the target level
304 # and I don't want to specifiy /F- for each moc/res/ui generated files (using Qt)
306 GET_TARGET_PROPERTY(oldProps ${_targetName} COMPILE_FLAGS)
307 if (oldProps MATCHES NOTFOUND)
311 SET(newProperties "${oldProps} /Yu\"${_input}\" /FI\"${_input}\"")
312 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES COMPILE_FLAGS "${newProperties}")
314 #also inlude ${oldProps} to have the same compile options
315 SET_SOURCE_FILES_PROPERTIES(${${_targetName}_pch} PROPERTIES COMPILE_FLAGS "${oldProps} /Yc\"${_input}\"")
317 elseif (CMAKE_GENERATOR MATCHES Xcode)
319 # For Xcode, cmake needs my patch to process
320 # GCC_PREFIX_HEADER and GCC_PRECOMPILE_PREFIX_HEADER as target properties
322 # When buiding out of the tree, precompiled may not be located
323 # Use full path instead.
324 GET_FILENAME_COMPONENT(fullPath ${_input} ABSOLUTE)
326 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PREFIX_HEADER "${fullPath}")
327 SET_TARGET_PROPERTIES(${_targetName} PROPERTIES XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER "YES")
331 #Fallback to the "old" precompiled suppport
332 #ADD_PRECOMPILED_HEADER(${_targetName} ${_input} ${_dowarn})
336 ENDMACRO(ADD_NATIVE_PRECOMPILED_HEADER)
338 macro(ocv_add_precompiled_header_to_target the_target pch_header)
339 if(PCHSupport_FOUND AND ENABLE_PRECOMPILED_HEADERS AND EXISTS "${pch_header}")
340 if(CMAKE_GENERATOR MATCHES Visual)
341 string(REGEX REPLACE "hpp$" "cpp" ${the_target}_pch "${pch_header}")
342 add_native_precompiled_header(${the_target} ${pch_header})
343 unset(${the_target}_pch)
344 elseif(CMAKE_GENERATOR MATCHES Xcode)
345 add_native_precompiled_header(${the_target} ${pch_header})
346 elseif(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_GENERATOR MATCHES "Makefiles|Ninja")
347 add_precompiled_header(${the_target} ${pch_header})