if(MINGW OR (X86 AND UNIX AND NOT APPLE))
# mingw compiler is known to produce unstable SSE code with -O3 hence we are trying to use -O2 instead
if(CMAKE_COMPILER_IS_GNUCXX)
foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
string(REPLACE "-O3" "-O2" ${flags} "${${flags}}")
endforeach()
endif()
if(CMAKE_COMPILER_IS_GNUCC)
foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_DEBUG)
string(REPLACE "-O3" "-O2" ${flags} "${${flags}}")
endforeach()
endif()
endif()
if(MSVC)
string(REGEX REPLACE "^ *| * $" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REGEX REPLACE "^ *| * $" "" CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT}")
if(CMAKE_CXX_FLAGS STREQUAL CMAKE_CXX_FLAGS_INIT)
# override cmake default exception handling option
string(REPLACE "/EHsc" "/EHa" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "Flags used by the compiler during all build types." FORCE)
endif()
endif()
set(OPENCV_EXTRA_FLAGS "")
set(OPENCV_EXTRA_C_FLAGS "")
set(OPENCV_EXTRA_CXX_FLAGS "")
set(OPENCV_EXTRA_FLAGS_RELEASE "")
set(OPENCV_EXTRA_FLAGS_DEBUG "")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "")
macro(add_extra_compiler_option option)
if(CMAKE_BUILD_TYPE)
set(CMAKE_TRY_COMPILE_CONFIGURATION ${CMAKE_BUILD_TYPE})
endif()
ocv_check_flag_support(CXX "${option}" _varname "${OPENCV_EXTRA_CXX_FLAGS} ${ARGN}")
if(${_varname})
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
endif()
ocv_check_flag_support(C "${option}" _varname "${OPENCV_EXTRA_C_FLAGS} ${ARGN}")
if(${_varname})
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
endif()
endmacro()
# OpenCV fails some tests when 'char' is 'unsigned' by default
add_extra_compiler_option(-fsigned-char)
if(MINGW)
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
# here we are trying to workaround the problem
add_extra_compiler_option(-mstackrealign)
if(NOT HAVE_CXX_MSTACKREALIGN)
add_extra_compiler_option(-mpreferred-stack-boundary=2)
endif()
endif()
if(CMAKE_COMPILER_IS_GNUCXX)
# High level of warnings.
add_extra_compiler_option(-W)
add_extra_compiler_option(-Wall)
add_extra_compiler_option(-Werror=return-type)
add_extra_compiler_option(-Werror=non-virtual-dtor)
add_extra_compiler_option(-Werror=address)
add_extra_compiler_option(-Werror=sequence-point)
add_extra_compiler_option(-Wformat)
add_extra_compiler_option(-Werror=format-security -Wformat)
add_extra_compiler_option(-Wmissing-declarations)
add_extra_compiler_option(-Wmissing-prototypes)
add_extra_compiler_option(-Wstrict-prototypes)
add_extra_compiler_option(-Wundef)
add_extra_compiler_option(-Winit-self)
add_extra_compiler_option(-Wpointer-arith)
add_extra_compiler_option(-Wshadow)
add_extra_compiler_option(-Wsign-promo)
if(ENABLE_NOISY_WARNINGS)
add_extra_compiler_option(-Wcast-align)
add_extra_compiler_option(-Wstrict-aliasing=2)
else()
add_extra_compiler_option(-Wno-narrowing)
add_extra_compiler_option(-Wno-delete-non-virtual-dtor)
add_extra_compiler_option(-Wno-unnamed-type-template-args)
endif()
add_extra_compiler_option(-fdiagnostics-show-option)
# The -Wno-long-long is required in 64bit systems when including sytem headers.
if(X86_64)
add_extra_compiler_option(-Wno-long-long)
endif()
# We need pthread's
if(UNIX AND NOT ANDROID AND NOT (APPLE AND CMAKE_COMPILER_IS_CLANGCXX))
add_extra_compiler_option(-pthread)
endif()
if(CMAKE_COMPILER_IS_CLANGCXX)
add_extra_compiler_option(-Qunused-arguments)
endif()
if(OPENCV_WARNINGS_ARE_ERRORS)
add_extra_compiler_option(-Werror)
endif()
if(X86 AND NOT MINGW64 AND NOT X86_64 AND NOT APPLE)
add_extra_compiler_option(-march=i686)
endif()
if(APPLE)
add_extra_compiler_option(-Wno-semicolon-before-method-body)
endif()
# Other optimizations
if(ENABLE_OMIT_FRAME_POINTER)
add_extra_compiler_option(-fomit-frame-pointer)
else()
add_extra_compiler_option(-fno-omit-frame-pointer)
endif()
if(ENABLE_FAST_MATH)
add_extra_compiler_option(-ffast-math)
endif()
if(ENABLE_POWERPC)
add_extra_compiler_option("-mcpu=G3 -mtune=G5")
endif()
if(ENABLE_SSE)
add_extra_compiler_option(-msse)
endif()
if(ENABLE_SSE2)
add_extra_compiler_option(-msse2)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-sse2)
endif()
if(ENABLE_NEON)
add_extra_compiler_option("-mfpu=neon")
endif()
if(ENABLE_VFPV3 AND NOT ENABLE_NEON)
add_extra_compiler_option("-mfpu=vfpv3")
endif()
# SSE3 and further should be disabled under MingW because it generates compiler errors
if(NOT MINGW)
if(ENABLE_AVX)
add_extra_compiler_option(-mavx)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-avx)
endif()
if(ENABLE_AVX2)
add_extra_compiler_option(-mavx2)
if(ENABLE_FMA3)
add_extra_compiler_option(-mfma)
endif()
endif()
# GCC depresses SSEx instructions when -mavx is used. Instead, it generates new AVX instructions or AVX equivalence for all SSEx instructions when needed.
if(NOT OPENCV_EXTRA_CXX_FLAGS MATCHES "-mavx")
if(ENABLE_SSE3)
add_extra_compiler_option(-msse3)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-sse3)
endif()
if(ENABLE_SSSE3)
add_extra_compiler_option(-mssse3)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-ssse3)
endif()
if(ENABLE_SSE41)
add_extra_compiler_option(-msse4.1)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-sse4.1)
endif()
if(ENABLE_SSE42)
add_extra_compiler_option(-msse4.2)
elseif(X86 OR X86_64)
add_extra_compiler_option(-mno-sse4.2)
endif()
if(ENABLE_POPCNT)
add_extra_compiler_option(-mpopcnt)
endif()
endif()
endif(NOT MINGW)
if(X86 OR X86_64)
if(NOT APPLE AND CMAKE_SIZEOF_VOID_P EQUAL 4)
if(OPENCV_EXTRA_CXX_FLAGS MATCHES "-m(sse2|avx)")
add_extra_compiler_option(-mfpmath=sse)# !! important - be on the same wave with x64 compilers
else()
add_extra_compiler_option(-mfpmath=387)
endif()
endif()
endif()
# Profiling?
if(ENABLE_PROFILING)
add_extra_compiler_option("-pg -g")
# turn off incompatible options
foreach(flags CMAKE_CXX_FLAGS CMAKE_C_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS_DEBUG
OPENCV_EXTRA_FLAGS_RELEASE OPENCV_EXTRA_FLAGS_DEBUG OPENCV_EXTRA_C_FLAGS OPENCV_EXTRA_CXX_FLAGS)
string(REPLACE "-fomit-frame-pointer" "" ${flags} "${${flags}}")
string(REPLACE "-ffunction-sections" "" ${flags} "${${flags}}")
endforeach()
elseif(NOT APPLE AND NOT ANDROID)
# Remove unreferenced functions: function level linking
add_extra_compiler_option(-ffunction-sections)
endif()
if(ENABLE_COVERAGE)
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} --coverage")
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} --coverage")
endif()
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0 -DDEBUG -D_DEBUG")
endif()
if(MSVC)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS")
# 64-bit portability warnings, in MSVC80
if(MSVC80)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Wp64")
endif()
if(BUILD_WITH_DEBUG_INFO)
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /debug")
endif()
# Remove unreferenced functions: function level linking
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Gy")
if(NOT MSVC_VERSION LESS 1400)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /bigobj")
endif()
if(BUILD_WITH_DEBUG_INFO)
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /Zi")
endif()
if(ENABLE_AVX2 AND NOT MSVC_VERSION LESS 1800)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:AVX2")
endif()
if(ENABLE_AVX AND NOT MSVC_VERSION LESS 1600 AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:AVX")
endif()
if(ENABLE_SSE4_1 AND CV_ICC AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE4.1")
endif()
if(ENABLE_SSE3 AND CV_ICC AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE3")
endif()
if(NOT MSVC64)
# 64-bit MSVC compiler uses SSE/SSE2 by default
if(ENABLE_SSE2 AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE2")
endif()
if(ENABLE_SSE AND NOT OPENCV_EXTRA_FLAGS MATCHES "/arch:")
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /arch:SSE")
endif()
endif()
if(ENABLE_SSE OR ENABLE_SSE2 OR ENABLE_SSE3 OR ENABLE_SSE4_1 OR ENABLE_AVX OR ENABLE_AVX2)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Oi")
endif()
if(X86 OR X86_64)
if(CMAKE_SIZEOF_VOID_P EQUAL 4 AND ENABLE_SSE2)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /fp:fast") # !! important - be on the same wave with x64 compilers
endif()
endif()
if(OPENCV_WARNINGS_ARE_ERRORS)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /WX")
endif()
endif()
if(MSVC12 AND NOT CMAKE_GENERATOR MATCHES "Visual Studio")
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} /FS")
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} /FS")
endif()
# Extra link libs if the user selects building static libs:
if(NOT BUILD_SHARED_LIBS AND CMAKE_COMPILER_IS_GNUCXX AND NOT ANDROID)
# Android does not need these settings because they are already set by toolchain file
set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} stdc++)
set(OPENCV_EXTRA_FLAGS "-fPIC ${OPENCV_EXTRA_FLAGS}")
endif()
# Add user supplied extra options (optimization, etc...)
# ==========================================================
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS}" CACHE INTERNAL "Extra compiler options")
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS}" CACHE INTERNAL "Extra compiler options for C sources")
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS}" CACHE INTERNAL "Extra compiler options for C++ sources")
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE}" CACHE INTERNAL "Extra compiler options for Release build")
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG}" CACHE INTERNAL "Extra compiler options for Debug build")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS}" CACHE INTERNAL "Extra linker flags")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}" CACHE INTERNAL "Extra linker flags for Release build")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}" CACHE INTERNAL "Extra linker flags for Debug build")
# set default visibility to hidden
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_OPENCV_GCC_VERSION_NUM GREATER 399)
add_extra_compiler_option(-fvisibility=hidden)
add_extra_compiler_option(-fvisibility-inlines-hidden)
endif()
#combine all "extra" options
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${OPENCV_EXTRA_FLAGS_RELEASE}")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OPENCV_EXTRA_EXE_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE}")
set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}")
if(MSVC)
# avoid warnings from MSVC about overriding the /W* option
# we replace /W3 with /W4 only for C++ files,
# since all the 3rd-party libraries OpenCV uses are in C,
# and we do not care about their warnings.
string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
string(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
if(NOT ENABLE_NOISY_WARNINGS AND MSVC_VERSION EQUAL 1400)
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4510 /wd4610 /wd4312 /wd4201 /wd4244 /wd4328 /wd4267)
endif()
# allow extern "C" functions throw exceptions
foreach(flags CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_RELEASE CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
string(REPLACE "/EHsc-" "/EHs" ${flags} "${${flags}}")
string(REPLACE "/EHsc" "/EHs" ${flags} "${${flags}}")
string(REPLACE "/Zm1000" "" ${flags} "${${flags}}")
endforeach()
if(NOT ENABLE_NOISY_WARNINGS)
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4251) # class 'std::XXX' needs to have dll-interface to be used by clients of YYY
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4324) # 'struct_name' : structure was padded due to __declspec(align())
endif()
endif()