1 if(MINGW OR (X86 AND UNIX AND NOT APPLE))
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}")
50 # OpenCV fails some tests when 'char' is 'unsigned' by default
51 add_extra_compiler_option(-fsigned-char)
54 # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
55 # here we are trying to workaround the problem
56 add_extra_compiler_option(-mstackrealign)
57 if(NOT HAVE_CXX_MSTACKREALIGN)
58 add_extra_compiler_option(-mpreferred-stack-boundary=2)
62 if(OPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
63 add_definitions(-DOPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
66 if(CMAKE_COMPILER_IS_GNUCXX)
67 # High level of warnings.
68 add_extra_compiler_option(-W)
69 add_extra_compiler_option(-Wall)
70 add_extra_compiler_option(-Werror=return-type)
71 if(OPENCV_CAN_BREAK_BINARY_COMPATIBILITY)
72 add_extra_compiler_option(-Werror=non-virtual-dtor)
74 add_extra_compiler_option(-Werror=address)
75 add_extra_compiler_option(-Werror=sequence-point)
76 add_extra_compiler_option(-Wformat)
77 add_extra_compiler_option(-Werror=format-security -Wformat)
78 add_extra_compiler_option(-Wmissing-declarations)
79 add_extra_compiler_option(-Wmissing-prototypes)
80 add_extra_compiler_option(-Wstrict-prototypes)
81 add_extra_compiler_option(-Wundef)
82 add_extra_compiler_option(-Winit-self)
83 add_extra_compiler_option(-Wpointer-arith)
84 add_extra_compiler_option(-Wshadow)
85 add_extra_compiler_option(-Wsign-promo)
87 if(ENABLE_NOISY_WARNINGS)
88 add_extra_compiler_option(-Wcast-align)
89 add_extra_compiler_option(-Wstrict-aliasing=2)
91 add_extra_compiler_option(-Wno-narrowing)
92 add_extra_compiler_option(-Wno-delete-non-virtual-dtor)
93 add_extra_compiler_option(-Wno-unnamed-type-template-args)
95 add_extra_compiler_option(-fdiagnostics-show-option)
97 # The -Wno-long-long is required in 64bit systems when including sytem headers.
99 add_extra_compiler_option(-Wno-long-long)
103 if(UNIX AND NOT ANDROID AND NOT (APPLE AND CMAKE_COMPILER_IS_CLANGCXX))
104 add_extra_compiler_option(-pthread)
107 if(OPENCV_WARNINGS_ARE_ERRORS)
108 add_extra_compiler_option(-Werror)
111 if(X86 AND NOT MINGW64 AND NOT X86_64 AND NOT APPLE)
112 add_extra_compiler_option(-march=i686)
115 # Other optimizations
116 if(ENABLE_OMIT_FRAME_POINTER)
117 add_extra_compiler_option(-fomit-frame-pointer)
119 add_extra_compiler_option(-fno-omit-frame-pointer)
122 add_extra_compiler_option(-ffast-math)
125 add_extra_compiler_option("-mcpu=G3 -mtune=G5")
128 add_extra_compiler_option(-msse)
131 add_extra_compiler_option(-msse2)
134 add_extra_compiler_option("-mfpu=neon")
136 if (ENABLE_VFPV3 AND NOT ENABLE_NEON)
137 add_extra_compiler_option("-mfpu=vfpv3")
140 # SSE3 and further should be disabled under MingW because it generates compiler errors
143 add_extra_compiler_option(-mavx)
146 # GCC depresses SSEx instructions when -mavx is used. Instead, it generates new AVX instructions or AVX equivalence for all SSEx instructions when needed.
147 if(NOT OPENCV_EXTRA_CXX_FLAGS MATCHES "-mavx")
149 add_extra_compiler_option(-msse3)
153 add_extra_compiler_option(-mssse3)
157 add_extra_compiler_option(-msse4.1)
161 add_extra_compiler_option(-msse4.2)
167 if(NOT APPLE AND CMAKE_SIZEOF_VOID_P EQUAL 4)
168 if(OPENCV_EXTRA_CXX_FLAGS MATCHES "-m(sse2|avx)")
169 add_extra_compiler_option(-mfpmath=sse)# !! important - be on the same wave with x64 compilers
171 add_extra_compiler_option(-mfpmath=387)
178 add_extra_compiler_option("-pg -g")
179 # turn off incompatible options
180 foreach(flags CMAKE_CXX_FLAGS CMAKE_C_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS_DEBUG
181 OPENCV_EXTRA_FLAGS_RELEASE OPENCV_EXTRA_FLAGS_DEBUG OPENCV_EXTRA_C_FLAGS OPENCV_EXTRA_CXX_FLAGS)
182 string(REPLACE "-fomit-frame-pointer" "" ${flags} "${${flags}}")
183 string(REPLACE "-ffunction-sections" "" ${flags} "${${flags}}")
185 elseif(NOT APPLE AND NOT ANDROID)
186 # Remove unreferenced functions: function level linking
187 add_extra_compiler_option(-ffunction-sections)
190 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
191 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0 -DDEBUG -D_DEBUG")
195 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS")
196 # 64-bit portability warnings, in MSVC80
198 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Wp64")
201 if(BUILD_WITH_DEBUG_INFO)
202 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /debug")
205 # Remove unreferenced functions: function level linking
206 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Gy")
207 if(NOT MSVC_VERSION LESS 1400)
208 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /bigobj")
210 if(BUILD_WITH_DEBUG_INFO)
211 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /Zi")
214 if(ENABLE_AVX AND NOT MSVC_VERSION LESS 1600)
215 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:AVX")
218 if(ENABLE_SSE4_1 AND CV_ICC AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
219 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE4.1")
222 if(ENABLE_SSE3 AND CV_ICC AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
223 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE3")
227 # 64-bit MSVC compiler uses SSE/SSE2 by default
228 if(ENABLE_SSE2 AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
229 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE2")
231 if(ENABLE_SSE AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
232 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE")
236 if(ENABLE_SSE OR ENABLE_SSE2 OR ENABLE_SSE3 OR ENABLE_SSE4_1 OR ENABLE_AVX)
237 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Oi")
241 if(CMAKE_SIZEOF_VOID_P EQUAL 4 AND ENABLE_SSE2)
242 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /fp:fast") # !! important - be on the same wave with x64 compilers
246 if(OPENCV_WARNINGS_ARE_ERRORS)
247 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /WX")
251 # Extra link libs if the user selects building static libs:
252 if(NOT BUILD_SHARED_LIBS AND CMAKE_COMPILER_IS_GNUCXX AND NOT ANDROID)
253 # Android does not need these settings because they are already set by toolchain file
254 set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} stdc++)
255 set(OPENCV_EXTRA_FLAGS "-fPIC ${OPENCV_EXTRA_FLAGS}")
258 # Add user supplied extra options (optimization, etc...)
259 # ==========================================================
260 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS}" CACHE INTERNAL "Extra compiler options")
261 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS}" CACHE INTERNAL "Extra compiler options for C sources")
262 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS}" CACHE INTERNAL "Extra compiler options for C++ sources")
263 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE}" CACHE INTERNAL "Extra compiler options for Release build")
264 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG}" CACHE INTERNAL "Extra compiler options for Debug build")
265 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS}" CACHE INTERNAL "Extra linker flags")
266 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}" CACHE INTERNAL "Extra linker flags for Release build")
267 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}" CACHE INTERNAL "Extra linker flags for Debug build")
269 #combine all "extra" options
270 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_C_FLAGS}")
271 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}")
272 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
273 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
274 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
275 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
276 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OPENCV_EXTRA_EXE_LINKER_FLAGS}")
277 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}")
278 set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}")
281 # avoid warnings from MSVC about overriding the /W* option
282 # we replace /W3 with /W4 only for C++ files,
283 # since all the 3rd-party libraries OpenCV uses are in C,
284 # and we do not care about their warnings.
285 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
286 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
287 string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
289 if(NOT ENABLE_NOISY_WARNINGS AND MSVC_VERSION EQUAL 1400)
290 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4510 /wd4610 /wd4312 /wd4201 /wd4244 /wd4328 /wd4267)
293 # allow extern "C" functions throw exceptions
294 foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
295 string(REPLACE "/EHsc-" "/EHs" ${flags} "${${flags}}")
296 string(REPLACE "/EHsc" "/EHs" ${flags} "${${flags}}")
298 string(REPLACE "/Zm1000" "" ${flags} "${${flags}}")
301 if(NOT ENABLE_NOISY_WARNINGS)
302 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4251") #class 'std::XXX' needs to have dll-interface to be used by clients of YYY