2 # mingw compiler is known to produce unstable SSE code with -O3 hence we are trying to use -O2 instead
3 if(CMAKE_COMPILER_IS_GNUCXX)
4 foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
5 string(REPLACE "-O3" "-O2" ${flags} "${${flags}}")
9 if(CMAKE_COMPILER_IS_GNUCC)
10 foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_DEBUG)
11 string(REPLACE "-O3" "-O2" ${flags} "${${flags}}")
17 string(REGEX REPLACE "^ *| * $" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
18 string(REGEX REPLACE "^ *| * $" "" CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT}")
19 if(CMAKE_CXX_FLAGS STREQUAL CMAKE_CXX_FLAGS_INIT)
20 # override cmake default exception handling option
21 string(REPLACE "/EHsc" "/EHa" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
22 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "Flags used by the compiler during all build types." FORCE)
26 set(OPENCV_EXTRA_FLAGS "")
27 set(OPENCV_EXTRA_C_FLAGS "")
28 set(OPENCV_EXTRA_CXX_FLAGS "")
29 set(OPENCV_EXTRA_FLAGS_RELEASE "")
30 set(OPENCV_EXTRA_FLAGS_DEBUG "")
31 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "")
32 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "")
33 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "")
35 macro(add_extra_compiler_option option)
37 set(CMAKE_TRY_COMPILE_CONFIGURATION ${CMAKE_BUILD_TYPE})
39 ocv_check_flag_support(CXX "${option}" _varname "${OPENCV_EXTRA_CXX_FLAGS} ${ARGN}")
41 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
44 ocv_check_flag_support(C "${option}" _varname "${OPENCV_EXTRA_C_FLAGS} ${ARGN}")
46 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
51 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
52 # here we are trying to workaround the problem
53 add_extra_compiler_option(-mstackrealign)
54 if(NOT HAVE_CXX_MSTACKREALIGN)
55 add_extra_compiler_option(-mpreferred-stack-boundary=2)
59 if(CMAKE_COMPILER_IS_GNUCXX)
60 # High level of warnings.
61 add_extra_compiler_option(-W)
62 add_extra_compiler_option(-Wall)
63 add_extra_compiler_option(-Werror=return-type)
64 add_extra_compiler_option(-Werror=non-virtual-dtor)
65 add_extra_compiler_option(-Werror=address)
66 add_extra_compiler_option(-Werror=sequence-point)
67 add_extra_compiler_option(-Wformat)
68 add_extra_compiler_option(-Werror=format-security -Wformat)
69 add_extra_compiler_option(-Wmissing-declarations)
70 add_extra_compiler_option(-Wmissing-prototypes)
71 add_extra_compiler_option(-Wstrict-prototypes)
72 add_extra_compiler_option(-Wundef)
73 add_extra_compiler_option(-Winit-self)
74 add_extra_compiler_option(-Wpointer-arith)
75 add_extra_compiler_option(-Wshadow)
76 add_extra_compiler_option(-Wsign-promo)
78 if(ENABLE_NOISY_WARNINGS)
79 add_extra_compiler_option(-Wcast-align)
80 add_extra_compiler_option(-Wstrict-aliasing=2)
82 add_extra_compiler_option(-Wno-narrowing)
83 add_extra_compiler_option(-Wno-delete-non-virtual-dtor)
84 add_extra_compiler_option(-Wno-unnamed-type-template-args)
86 add_extra_compiler_option(-fdiagnostics-show-option)
88 # The -Wno-long-long is required in 64bit systems when including sytem headers.
90 add_extra_compiler_option(-Wno-long-long)
94 if(UNIX AND NOT ANDROID)
95 add_extra_compiler_option(-pthread)
98 if(OPENCV_WARNINGS_ARE_ERRORS)
99 add_extra_compiler_option(-Werror)
102 if(X86 AND NOT MINGW64 AND NOT X86_64 AND NOT APPLE)
103 add_extra_compiler_option(-march=i686)
106 # Other optimizations
107 if(ENABLE_OMIT_FRAME_POINTER)
108 add_extra_compiler_option(-fomit-frame-pointer)
110 add_extra_compiler_option(-fno-omit-frame-pointer)
113 add_extra_compiler_option(-ffast-math)
116 add_extra_compiler_option("-mcpu=G3 -mtune=G5")
119 add_extra_compiler_option(-msse)
122 add_extra_compiler_option(-msse2)
125 # SSE3 and further should be disabled under MingW because it generates compiler errors
128 add_extra_compiler_option(-msse3)
131 if(${CMAKE_OPENCV_GCC_VERSION_NUM} GREATER 402)
132 set(HAVE_GCC43_OR_NEWER 1)
134 if(${CMAKE_OPENCV_GCC_VERSION_NUM} GREATER 401)
135 set(HAVE_GCC42_OR_NEWER 1)
138 if(HAVE_GCC42_OR_NEWER OR APPLE)
140 add_extra_compiler_option(-mssse3)
142 if(HAVE_GCC43_OR_NEWER OR APPLE)
144 add_extra_compiler_option(-msse4.1)
147 add_extra_compiler_option(-msse4.2)
154 if(NOT APPLE AND CMAKE_SIZEOF_VOID_P EQUAL 4)
156 add_extra_compiler_option(-mfpmath=sse)# !! important - be on the same wave with x64 compilers
158 add_extra_compiler_option(-mfpmath=387)
165 add_extra_compiler_option("-pg -g")
166 # turn off incompatible options
167 foreach(flags CMAKE_CXX_FLAGS CMAKE_C_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS_DEBUG
168 OPENCV_EXTRA_FLAGS_RELEASE OPENCV_EXTRA_FLAGS_DEBUG OPENCV_EXTRA_C_FLAGS OPENCV_EXTRA_CXX_FLAGS)
169 string(REPLACE "-fomit-frame-pointer" "" ${flags} "${${flags}}")
170 string(REPLACE "-ffunction-sections" "" ${flags} "${${flags}}")
172 elseif(NOT APPLE AND NOT ANDROID)
173 # Remove unreferenced functions: function level linking
174 add_extra_compiler_option(-ffunction-sections)
177 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
178 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0 -DDEBUG -D_DEBUG")
179 if(BUILD_WITH_DEBUG_INFO)
180 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -ggdb3")
185 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS")
186 # 64-bit portability warnings, in MSVC80
188 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Wp64")
191 if(BUILD_WITH_DEBUG_INFO)
192 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /debug")
195 # Remove unreferenced functions: function level linking
196 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Gy")
197 if(NOT MSVC_VERSION LESS 1400)
198 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /bigobj")
200 if(BUILD_WITH_DEBUG_INFO)
201 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /Zi")
205 # 64-bit MSVC compiler uses SSE/SSE2 by default
207 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE")
210 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE2")
215 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE3")
218 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE4.1")
221 if(ENABLE_SSE OR ENABLE_SSE2 OR ENABLE_SSE3 OR ENABLE_SSE4_1)
222 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Oi")
226 if(CMAKE_SIZEOF_VOID_P EQUAL 4 AND ENABLE_SSE2)
227 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /fp:fast")# !! important - be on the same wave with x64 compilers
232 # Extra link libs if the user selects building static libs:
233 if(NOT BUILD_SHARED_LIBS AND CMAKE_COMPILER_IS_GNUCXX AND NOT ANDROID)
234 # Android does not need these settings because they are already set by toolchain file
235 set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} stdc++)
236 set(OPENCV_EXTRA_FLAGS "-fPIC ${OPENCV_EXTRA_FLAGS}")
239 # Add user supplied extra options (optimization, etc...)
240 # ==========================================================
241 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS}" CACHE INTERNAL "Extra compiler options")
242 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS}" CACHE INTERNAL "Extra compiler options for C sources")
243 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS}" CACHE INTERNAL "Extra compiler options for C++ sources")
244 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE}" CACHE INTERNAL "Extra compiler options for Release build")
245 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG}" CACHE INTERNAL "Extra compiler options for Debug build")
246 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS}" CACHE INTERNAL "Extra linker flags")
247 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}" CACHE INTERNAL "Extra linker flags for Release build")
248 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}" CACHE INTERNAL "Extra linker flags for Debug build")
250 #combine all "extra" options
251 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_C_FLAGS}")
252 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}")
253 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
254 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
255 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
256 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
257 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OPENCV_EXTRA_EXE_LINKER_FLAGS}")
258 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}")
259 set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}")
262 # avoid warnings from MSVC about overriding the /W* option
263 # we replace /W3 with /W4 only for C++ files,
264 # since all the 3rd-party libraries OpenCV uses are in C,
265 # and we do not care about their warnings.
266 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
267 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
268 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
270 if(NOT ENABLE_NOISY_WARNINGS AND MSVC_VERSION EQUAL 1400)
271 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4510 /wd4610 /wd4312 /wd4201 /wd4244 /wd4328 /wd4267)
274 # allow extern "C" functions throw exceptions
275 foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
276 string(REPLACE "/EHsc-" "/EHs" ${flags} "${${flags}}")
277 string(REPLACE "/EHsc" "/EHs" ${flags} "${${flags}}")
279 string(REPLACE "/Zm1000" "" ${flags} "${${flags}}")
282 if(NOT ENABLE_NOISY_WARNINGS)
283 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4251") #class 'std::XXX' needs to have dll-interface to be used by clients of YYY
288 if (MSVC AND ENABLE_MULTI_PROCESSOR_COMPILATION)
289 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")