1 if("${CMAKE_CXX_COMPILER};${CMAKE_C_COMPILER};${CMAKE_CXX_COMPILER_LAUNCHER}" MATCHES "ccache")
2 set(CMAKE_COMPILER_IS_CCACHE 1) # TODO: FIXIT Avoid setting of CMAKE_ variables
3 set(OPENCV_COMPILER_IS_CCACHE 1)
5 function(access_CMAKE_COMPILER_IS_CCACHE)
6 if(NOT OPENCV_SUPPRESS_DEPRECATIONS)
7 message(WARNING "DEPRECATED: CMAKE_COMPILER_IS_CCACHE is replaced to OPENCV_COMPILER_IS_CCACHE.")
10 variable_watch(CMAKE_COMPILER_IS_CCACHE access_CMAKE_COMPILER_IS_CCACHE)
11 if(ENABLE_CCACHE AND NOT OPENCV_COMPILER_IS_CCACHE)
12 # This works fine with Unix Makefiles and Ninja generators
13 find_host_program(CCACHE_PROGRAM ccache)
15 message(STATUS "Looking for ccache - found (${CCACHE_PROGRAM})")
16 get_property(__OLD_RULE_LAUNCH_COMPILE GLOBAL PROPERTY RULE_LAUNCH_COMPILE)
17 if(CMAKE_GENERATOR MATCHES "Xcode")
18 configure_file("${CMAKE_CURRENT_LIST_DIR}/templates/xcode-launch-c.in" "${CMAKE_BINARY_DIR}/xcode-launch-c")
19 configure_file("${CMAKE_CURRENT_LIST_DIR}/templates/xcode-launch-cxx.in" "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
20 execute_process(COMMAND chmod a+rx
21 "${CMAKE_BINARY_DIR}/xcode-launch-c"
22 "${CMAKE_BINARY_DIR}/xcode-launch-cxx"
24 # Xcode project attributes
25 set(CMAKE_XCODE_ATTRIBUTE_CC "${CMAKE_BINARY_DIR}/xcode-launch-c")
26 set(CMAKE_XCODE_ATTRIBUTE_CXX "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
27 set(CMAKE_XCODE_ATTRIBUTE_LD "${CMAKE_BINARY_DIR}/xcode-launch-c")
28 set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
29 set(OPENCV_COMPILER_IS_CCACHE 1)
30 message(STATUS "ccache: enable support through Xcode project properties")
31 elseif(__OLD_RULE_LAUNCH_COMPILE)
32 message(STATUS "Can't replace CMake compiler launcher")
34 set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
35 # NOTE: Actually this check doesn't work as expected.
36 # "RULE_LAUNCH_COMPILE" is ignored by CMake during try_compile() step.
37 # ocv_check_compiler_flag(CXX "" IS_CCACHE_WORKS)
38 set(IS_CCACHE_WORKS 1)
40 set(OPENCV_COMPILER_IS_CCACHE 1)
42 message(STATUS "Unable to compile program with enabled ccache, reverting...")
43 set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${__OLD_RULE_LAUNCH_COMPILE}")
47 message(STATUS "Looking for ccache - not found")
51 if((CV_CLANG AND NOT CMAKE_GENERATOR MATCHES "Xcode") # PCH has no support for Clang
52 OR OPENCV_COMPILER_IS_CCACHE
54 set(ENABLE_PRECOMPILED_HEADERS OFF CACHE BOOL "" FORCE)
57 macro(add_extra_compiler_option option)
58 ocv_check_flag_support(CXX "${option}" _varname "${OPENCV_EXTRA_CXX_FLAGS} ${ARGN}")
60 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
63 ocv_check_flag_support(C "${option}" _varname "${OPENCV_EXTRA_C_FLAGS} ${ARGN}")
65 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
69 macro(add_extra_compiler_option_force option)
70 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
71 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
75 # Gets environment variable and puts its value to the corresponding preprocessor definition
76 # Useful for WINRT that has no access to environment variables
77 macro(add_env_definitions option)
78 set(value $ENV{${option}})
79 if("${value}" STREQUAL "")
80 message(WARNING "${option} environment variable is empty. Please set it to appropriate location to get correct results")
82 string(REPLACE "\\" "\\\\" value ${value})
84 add_definitions("-D${option}=\"${value}\"")
88 # OpenCV fails some tests when 'char' is 'unsigned' by default
89 add_extra_compiler_option(-fsigned-char)
93 if(NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " /fp:")
95 add_extra_compiler_option("/fp:fast")
97 add_extra_compiler_option("/fp:precise")
101 if(NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " /fp:"
102 AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fp-model"
104 if(NOT ENABLE_FAST_MATH)
105 add_extra_compiler_option("-fp-model precise")
108 elseif(CV_GCC OR CV_CLANG)
110 add_extra_compiler_option(-ffast-math)
114 if(CV_GCC OR CV_CLANG)
115 # High level of warnings.
116 add_extra_compiler_option(-W)
118 # clang-cl interprets -Wall as MSVC would: -Weverything, which is more than
120 add_extra_compiler_option(-Wall)
122 add_extra_compiler_option(-Werror=return-type)
123 add_extra_compiler_option(-Werror=non-virtual-dtor)
124 add_extra_compiler_option(-Werror=address)
125 add_extra_compiler_option(-Werror=sequence-point)
126 add_extra_compiler_option(-Wformat)
127 add_extra_compiler_option(-Werror=format-security -Wformat)
128 add_extra_compiler_option(-Wmissing-declarations)
129 add_extra_compiler_option(-Wmissing-prototypes)
130 add_extra_compiler_option(-Wstrict-prototypes)
131 add_extra_compiler_option(-Wundef)
132 add_extra_compiler_option(-Winit-self)
133 add_extra_compiler_option(-Wpointer-arith)
134 add_extra_compiler_option(-Wshadow)
135 add_extra_compiler_option(-Wsign-promo)
136 add_extra_compiler_option(-Wuninitialized)
137 if(CV_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0) AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0))
138 add_extra_compiler_option(-Wno-psabi)
141 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT ENABLE_PRECOMPILED_HEADERS)
142 add_extra_compiler_option(-Wsuggest-override)
143 elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
144 add_extra_compiler_option(-Winconsistent-missing-override)
148 if(ENABLE_NOISY_WARNINGS)
149 add_extra_compiler_option(-Wcast-align)
150 add_extra_compiler_option(-Wstrict-aliasing=2)
152 add_extra_compiler_option(-Wno-delete-non-virtual-dtor)
153 add_extra_compiler_option(-Wno-unnamed-type-template-args)
154 add_extra_compiler_option(-Wno-comment)
155 if(NOT OPENCV_SKIP_IMPLICIT_FALLTHROUGH
156 AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES "implicit-fallthrough"
157 AND (CV_GCC AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0.0)
159 add_extra_compiler_option(-Wimplicit-fallthrough=3)
161 if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
162 add_extra_compiler_option(-Wno-strict-overflow) # Issue appears when compiling surf.cpp from opencv_contrib/modules/xfeatures2d
164 if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
165 add_extra_compiler_option(-Wno-missing-field-initializers) # GCC 4.x emits warnings about {}, fixed in GCC 5+
167 if(CV_CLANG AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
168 add_extra_compiler_option(-Wno-deprecated-enum-enum-conversion)
169 add_extra_compiler_option(-Wno-deprecated-anon-enum-enum-conversion)
172 add_extra_compiler_option(-fdiagnostics-show-option)
174 # The -Wno-long-long is required in 64bit systems when including system headers.
176 add_extra_compiler_option(-Wno-long-long)
182 AND NOT (APPLE AND CV_CLANG)
185 OR (EMSCRIPTEN AND WITH_PTHREADS_PF) # https://github.com/opencv/opencv/issues/20285
187 add_extra_compiler_option(-pthread)
191 add_extra_compiler_option(-Qunused-arguments)
194 if(OPENCV_WARNINGS_ARE_ERRORS)
195 add_extra_compiler_option(-Werror)
199 add_extra_compiler_option(-Wno-semicolon-before-method-body)
202 # Other optimizations
203 if(ENABLE_OMIT_FRAME_POINTER)
204 add_extra_compiler_option(-fomit-frame-pointer)
205 elseif(DEFINED ENABLE_OMIT_FRAME_POINTER)
206 add_extra_compiler_option(-fno-omit-frame-pointer)
211 # turn off incompatible options
212 foreach(flags CMAKE_CXX_FLAGS CMAKE_C_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS_DEBUG
213 OPENCV_EXTRA_FLAGS_RELEASE OPENCV_EXTRA_FLAGS_DEBUG OPENCV_EXTRA_C_FLAGS OPENCV_EXTRA_CXX_FLAGS)
214 string(REPLACE "-fomit-frame-pointer" "" ${flags} "${${flags}}")
215 string(REPLACE "-ffunction-sections" "" ${flags} "${${flags}}")
216 string(REPLACE "-fdata-sections" "" ${flags} "${${flags}}")
218 # -pg should be placed both in the linker and in the compiler settings
219 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pg")
220 add_extra_compiler_option("-pg -g")
223 # TODO: Clang/C2 is not supported
224 elseif(((IOS OR ANDROID) AND NOT BUILD_SHARED_LIBS) AND NOT OPENCV_FORCE_FUNCTIONS_SECTIONS)
225 # don't create separate sections for functions/data, reduce package size
227 # Remove unreferenced functions: function level linking
228 add_extra_compiler_option(-ffunction-sections)
229 add_extra_compiler_option(-fdata-sections)
230 if(NOT OPENCV_SKIP_GC_SECTIONS)
232 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} -Wl,-dead_strip")
233 set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} -Wl,-dead_strip")
234 set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} -Wl,-dead_strip")
236 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} -Wl,--gc-sections")
237 set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} -Wl,--gc-sections")
238 set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} -Wl,--gc-sections")
245 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} --coverage")
246 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} --coverage")
247 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
250 if(ENABLE_INSTRUMENTATION)
252 message(WARNING "ENABLE_INSTRUMENTATION requires C++11 support")
254 set(WITH_VTK OFF) # There are issues with VTK 6.0
258 add_extra_compiler_option(-flto)
261 add_extra_compiler_option(-flto=thin)
264 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
265 if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG} " MATCHES "-O")
266 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0")
268 set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -DDEBUG -D_DEBUG")
270 if(BUILD_WITH_DEBUG_INFO)
271 # https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
272 # '-g' is equal to '-g2', '-g1' produces minimal information, enough for making backtraces
273 ocv_update(OPENCV_DEBUG_OPTION "-g1")
274 if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS_RELEASE}" MATCHES " -g")
275 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} ${OPENCV_DEBUG_OPTION}")
281 #TODO Code refactoring is required to resolve security warnings
282 #if(NOT ENABLE_BUILD_HARDENING)
283 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS")
286 if(BUILD_WITH_DEBUG_INFO)
287 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /Zi")
288 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /debug")
289 set(OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE} /debug")
290 set(OPENCV_EXTRA_MODULE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_MODULE_LINKER_FLAGS_RELEASE} /debug")
293 # Remove unreferenced functions: function level linking
294 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Gy")
295 if(NOT MSVC_VERSION LESS 1400)
296 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /bigobj")
299 if(OPENCV_WARNINGS_ARE_ERRORS)
300 set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /WX")
304 set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /GL")
305 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /LTCG")
308 if(NOT MSVC_VERSION LESS 1800 AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
309 set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} /FS")
310 set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} /FS")
314 include(cmake/OpenCVCompilerOptimizations.cmake)
315 if(COMMAND ocv_compiler_optimization_options)
316 ocv_compiler_optimization_options()
318 if(COMMAND ocv_compiler_optimization_options_finalize)
319 ocv_compiler_optimization_options_finalize()
322 # set default visibility to hidden
323 if((CV_GCC OR CV_CLANG)
325 AND NOT OPENCV_SKIP_VISIBILITY_HIDDEN
326 AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fvisibility")
327 add_extra_compiler_option(-fvisibility=hidden)
328 add_extra_compiler_option(-fvisibility-inlines-hidden)
331 # workaround gcc bug for aligned ld/st
332 # https://github.com/opencv/opencv/issues/13211
333 if((PPC64LE AND NOT CMAKE_CROSSCOMPILING) OR OPENCV_FORCE_COMPILER_CHECK_VSX_ALIGNED)
334 ocv_check_runtime_flag("${CPU_BASELINE_FLAGS}" OPENCV_CHECK_VSX_ALIGNED "${OpenCV_SOURCE_DIR}/cmake/checks/runtime/cpu_vsx_aligned.cpp")
335 if(NOT OPENCV_CHECK_VSX_ALIGNED)
336 add_extra_compiler_option_force(-DCV_COMPILER_VSX_BROKEN_ALIGNED)
339 # validate inline asm with fixes register number and constraints wa, wd, wf
341 ocv_check_compiler_flag(CXX "${CPU_BASELINE_FLAGS}" OPENCV_CHECK_VSX_ASM "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_vsx_asm.cpp")
342 if(NOT OPENCV_CHECK_VSX_ASM)
343 add_extra_compiler_option_force(-DCV_COMPILER_VSX_BROKEN_ASM)
347 # Apply "-Wl,--as-needed" linker flags: https://github.com/opencv/opencv/issues/7001
348 if(NOT OPENCV_SKIP_LINK_AS_NEEDED)
349 if(UNIX AND (NOT APPLE OR NOT CMAKE_VERSION VERSION_LESS "3.2"))
350 set(_option "-Wl,--as-needed")
351 set(_saved_CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
352 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${_option}") # requires CMake 3.2+ and CMP0056
353 ocv_check_compiler_flag(CXX "" HAVE_LINK_AS_NEEDED)
354 set(CMAKE_EXE_LINKER_FLAGS "${_saved_CMAKE_EXE_LINKER_FLAGS}")
355 if(HAVE_LINK_AS_NEEDED)
356 set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} ${_option}")
357 set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} ${_option}")
358 set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} ${_option}")
363 # combine all "extra" options
364 if(NOT OPENCV_SKIP_EXTRA_COMPILER_FLAGS)
365 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_C_FLAGS}")
366 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}")
367 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
368 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
369 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
370 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
371 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OPENCV_EXTRA_EXE_LINKER_FLAGS}")
372 set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}")
373 set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}")
374 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS}")
375 set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE}")
376 set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS_DEBUG}")
377 set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${OPENCV_EXTRA_MODULE_LINKER_FLAGS}")
378 set(CMAKE_MODULE_LINKER_FLAGS_RELEASE "${CMAKE_MODULE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_MODULE_LINKER_FLAGS_RELEASE}")
379 set(CMAKE_MODULE_LINKER_FLAGS_DEBUG "${CMAKE_MODULE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_MODULE_LINKER_FLAGS_DEBUG}")
383 if(NOT ENABLE_NOISY_WARNINGS)
384 if(MSVC_VERSION EQUAL 1400)
385 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4510 /wd4610 /wd4312 /wd4201 /wd4244 /wd4328 /wd4267)
389 foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
390 string(REPLACE "/Zm1000" "" ${flags} "${${flags}}")
393 # Enable 'extern "C"' and asynchronous (division by zero, access violation) exceptions
394 if(NOT OPENCV_SKIP_MSVC_EXCEPTIONS_FLAG)
395 foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
396 string(REGEX REPLACE " /EH[^ ]* " " " ${flags} " ${${flags}}")
398 if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_DEBUG}" MATCHES " /EH")
399 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHa")
403 if(NOT ENABLE_NOISY_WARNINGS)
404 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127) # conditional expression is constant
405 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4251) # class 'std::XXX' needs to have dll-interface to be used by clients of YYY
406 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4324) # 'struct_name' : structure was padded due to __declspec(align())
407 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4275) # non dll-interface class 'std::exception' used as base for dll-interface class 'cv::Exception'
408 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4512) # Assignment operator could not be generated
409 ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4589) # Constructor of abstract class 'cv::ORB' ignores initializer for virtual base class 'cv::Algorithm'
412 if(CV_ICC AND NOT ENABLE_NOISY_WARNINGS)
413 foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_DEBUG)
414 string(REGEX REPLACE "( |^)/W[0-9]+( |$)" "\\1\\2" ${flags} "${${flags}}")
416 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Qwd673") # PCH warning
420 if(APPLE AND NOT CMAKE_CROSSCOMPILING AND NOT DEFINED ENV{LDFLAGS} AND EXISTS "/usr/local/lib")
421 link_directories("/usr/local/lib")
424 if(ENABLE_BUILD_HARDENING)
425 include(${CMAKE_CURRENT_LIST_DIR}/OpenCVCompilerDefenses.cmake)
429 include(cmake/OpenCVCRTLinkage.cmake)
430 add_definitions(-D_VARIADIC_MAX=10)
433 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
434 get_directory_property(__DIRECTORY_COMPILE_DEFINITIONS COMPILE_DEFINITIONS)
435 if((NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS_RELEASE} ${__DIRECTORY_COMPILE_DEFINITIONS}" MATCHES "_WIN32_WINNT"
436 AND NOT OPENCV_CMAKE_SKIP_MACRO_WIN32_WINNT)
437 OR OPENCV_CMAKE_FORCE_MACRO_WIN32_WINNT
439 # https://docs.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt
440 # Target Windows 7 API
441 set(OPENCV_CMAKE_MACRO_WIN32_WINNT "0x0601" CACHE STRING "Value of _WIN32_WINNT macro")
442 add_definitions(-D_WIN32_WINNT=${OPENCV_CMAKE_MACRO_WIN32_WINNT})
446 # Enable compiler options for OpenCV modules/apps/samples only (ignore 3rdparty)
447 macro(ocv_add_modules_compiler_options)
448 if(MSVC AND NOT OPENCV_SKIP_MSVC_W4_OPTION)
449 foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
450 string(REPLACE "/W3" "/W4" ${flags} "${${flags}}")
453 if(OPENCV_ENABLE_MEMORY_SANITIZER)
454 add_definitions(-DOPENCV_ENABLE_MEMORY_SANITIZER=1)
458 # adjust -Wl,-rpath-link
460 if((NOT CMAKE_CROSSCOMPILING OR OPENCV_ENABLE_LINKER_RPATH_LINK_ORIGIN) AND NOT OPENCV_SKIP_LINKER_RPATH_LINK_ORIGIN)
461 if(DEFINED CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN)
462 list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN}")
464 list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "\$ORIGIN")
466 elseif(NOT OPENCV_SKIP_LINKER_RPATH_LINK_BINARY_LIB)
467 list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${LIBRARY_OUTPUT_PATH}")
470 if(OPENCV_EXTRA_RPATH_LINK_PATH)
471 string(REPLACE ":" ";" OPENCV_EXTRA_RPATH_LINK_PATH_ "${OPENCV_EXTRA_RPATH_LINK_PATH}")
472 list(APPEND CMAKE_PLATFORM_RUNTIME_PATH ${OPENCV_EXTRA_RPATH_LINK_PATH_})
473 if(NOT CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG)
474 message(WARNING "OPENCV_EXTRA_RPATH_LINK_PATH may not work properly because CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG is not defined (not supported)")
478 # Control MSVC /MP flag
479 # Input variables: OPENCV_MSVC_PARALLEL (ON,1,2,3,...) + OPENCV_SKIP_MSVC_PARALLEL
481 # - https://docs.microsoft.com/en-us/cpp/build/reference/mp-build-with-multiple-processes
482 # - https://docs.microsoft.com/en-us/cpp/build/reference/cl-environment-variables
483 # - https://gitlab.kitware.com/cmake/cmake/merge_requests/1718/diffs
484 if(CMAKE_GENERATOR MATCHES "Visual Studio" AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC|Intel")
485 ocv_check_environment_variables(OPENCV_SKIP_MSVC_PARALLEL)
486 if(OPENCV_SKIP_MSVC_PARALLEL)
488 elseif(" ${CMAKE_CXX_FLAGS}" MATCHES "/MP")
489 # nothing, already defined in compiler flags
490 elseif(DEFINED ENV{CL} AND " $ENV{CL}" MATCHES "/MP")
491 # nothing, compiler will use CL environment variable
492 elseif(DEFINED ENV{_CL_} AND " $ENV{_CL_}" MATCHES "/MP")
493 # nothing, compiler will use _CL_ environment variable
495 ocv_check_environment_variables(OPENCV_MSVC_PARALLEL)
497 if(DEFINED OPENCV_MSVC_PARALLEL)
498 set(_mp_value "${OPENCV_MSVC_PARALLEL}")
500 set(OPENCV_MSVC_PARALLEL "${_mp_value}" CACHE STRING "Control MSVC /MP flag")
502 if(_mp_value GREATER 0)
503 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP${_mp_value}")
504 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP${_mp_value}")
506 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
507 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")