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if("${CMAKE_CXX_COMPILER};${CMAKE_C_COMPILER};${CMAKE_CXX_COMPILER_LAUNCHER}" MATCHES "ccache")
set(CMAKE_COMPILER_IS_CCACHE 1) # TODO: FIXIT Avoid setting of CMAKE_ variables
set(OPENCV_COMPILER_IS_CCACHE 1)
endif()
function(access_CMAKE_COMPILER_IS_CCACHE)
if(NOT OPENCV_SUPPRESS_DEPRECATIONS)
message(WARNING "DEPRECATED: CMAKE_COMPILER_IS_CCACHE is replaced to OPENCV_COMPILER_IS_CCACHE.")
endif()
endfunction()
variable_watch(CMAKE_COMPILER_IS_CCACHE access_CMAKE_COMPILER_IS_CCACHE)
if(ENABLE_CCACHE AND NOT OPENCV_COMPILER_IS_CCACHE AND NOT CMAKE_GENERATOR MATCHES "Xcode")
# This works fine with Unix Makefiles and Ninja generators
find_host_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
message(STATUS "Looking for ccache - found (${CCACHE_PROGRAM})")
get_property(__OLD_RULE_LAUNCH_COMPILE GLOBAL PROPERTY RULE_LAUNCH_COMPILE)
if(__OLD_RULE_LAUNCH_COMPILE)
message(STATUS "Can't replace CMake compiler launcher")
else()
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_PROGRAM}")
# NOTE: Actually this check doesn't work as expected.
# "RULE_LAUNCH_COMPILE" is ignored by CMake during try_compile() step.
# ocv_check_compiler_flag(CXX "" IS_CCACHE_WORKS)
set(IS_CCACHE_WORKS 1)
if(IS_CCACHE_WORKS)
set(OPENCV_COMPILER_IS_CCACHE 1)
else()
message(STATUS "Unable to compile program with enabled ccache, reverting...")
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${__OLD_RULE_LAUNCH_COMPILE}")
endif()
endif()
else()
message(STATUS "Looking for ccache - not found")
endif()
endif()
if((CV_CLANG AND NOT CMAKE_GENERATOR MATCHES "Xcode") # PCH has no support for Clang
OR OPENCV_COMPILER_IS_CCACHE
)
set(ENABLE_PRECOMPILED_HEADERS OFF CACHE BOOL "" FORCE)
endif()
macro(add_extra_compiler_option option)
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} ${option}")
endif()
endmacro()
macro(add_extra_compiler_option_force option)
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
endmacro()
# Gets environment variable and puts its value to the corresponding preprocessor definition
# Useful for WINRT that has no access to environment variables
macro(add_env_definitions option)
set(value $ENV{${option}})
if("${value}" STREQUAL "")
message(WARNING "${option} environment variable is empty. Please set it to appropriate location to get correct results")
else()
string(REPLACE "\\" "\\\\" value ${value})
endif()
add_definitions("-D${option}=\"${value}\"")
endmacro()
if(NOT MSVC)
# OpenCV fails some tests when 'char' is 'unsigned' by default
add_extra_compiler_option(-fsigned-char)
endif()
if(CV_ICC AND NOT ENABLE_FAST_MATH)
if(MSVC)
add_extra_compiler_option("/fp:precise")
else()
add_extra_compiler_option("-fp-model precise")
endif()
endif()
if(CV_GCC OR CV_CLANG)
# 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)
add_extra_compiler_option(-Wuninitialized)
add_extra_compiler_option(-Winit-self)
if(HAVE_CXX11)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND NOT ENABLE_PRECOMPILED_HEADERS)
add_extra_compiler_option(-Wsuggest-override)
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
add_extra_compiler_option(-Winconsistent-missing-override)
endif()
endif()
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)
add_extra_compiler_option(-Wno-comment)
if(NOT OPENCV_SKIP_IMPLICIT_FALLTHROUGH
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES "implicit-fallthrough"
AND (CV_GCC AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0.0)
)
add_extra_compiler_option(-Wimplicit-fallthrough=3)
endif()
if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 7.0)
add_extra_compiler_option(-Wno-strict-overflow) # Issue appears when compiling surf.cpp from opencv_contrib/modules/xfeatures2d
endif()
endif()
add_extra_compiler_option(-fdiagnostics-show-option)
# The -Wno-long-long is required in 64bit systems when including system 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 CV_CLANG)) # TODO
add_extra_compiler_option(-pthread)
endif()
if(CV_CLANG)
add_extra_compiler_option(-Qunused-arguments)
endif()
if(OPENCV_WARNINGS_ARE_ERRORS)
add_extra_compiler_option(-Werror)
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)
elseif(DEFINED ENABLE_OMIT_FRAME_POINTER)
add_extra_compiler_option(-fno-omit-frame-pointer)
endif()
if(ENABLE_FAST_MATH)
add_extra_compiler_option(-ffast-math)
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}}")
string(REPLACE "-fdata-sections" "" ${flags} "${${flags}}")
endforeach()
elseif(NOT ((IOS OR ANDROID) AND NOT BUILD_SHARED_LIBS))
# Remove unreferenced functions: function level linking
add_extra_compiler_option(-ffunction-sections)
add_extra_compiler_option(-fdata-sections)
if(NOT APPLE AND NOT OPENCV_SKIP_GC_SECTIONS)
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} -Wl,--gc-sections")
endif()
endif()
if(ENABLE_COVERAGE)
set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} --coverage")
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} --coverage")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} --coverage")
endif()
if(ENABLE_INSTRUMENTATION)
if(NOT HAVE_CXX11)
message(WARNING "ENABLE_INSTRUMENTATION requires C++11 support")
endif()
set(WITH_VTK OFF) # There are issues with VTK 6.0
endif()
if(ENABLE_LTO)
add_extra_compiler_option(-flto)
endif()
if(ENABLE_THIN_LTO)
add_extra_compiler_option(-flto=thin)
endif()
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} -DNDEBUG")
if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG} ${OPENCV_EXTRA_FLAGS_DEBUG} " MATCHES "-O")
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -O0")
endif()
set(OPENCV_EXTRA_FLAGS_DEBUG "${OPENCV_EXTRA_FLAGS_DEBUG} -DDEBUG -D_DEBUG")
if(BUILD_WITH_DEBUG_INFO)
# https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
# '-g' is equal to '-g2', '-g1' produces minimal information, enough for making backtraces
ocv_update(OPENCV_DEBUG_OPTION "-g1")
if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS_RELEASE}" MATCHES " -g")
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} ${OPENCV_DEBUG_OPTION}")
endif()
endif()
endif()
if(MSVC)
#TODO Code refactoring is required to resolve security warnings
#if(NOT ENABLE_BUILD_HARDENING)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS")
#endif()
if(BUILD_WITH_DEBUG_INFO)
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /Zi")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /debug")
set(OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE} /debug")
endif()
# Remove unreferenced functions: function level linking
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /Gy")
if(NOT MSVC_VERSION LESS 1400)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /bigobj")
endif()
if(OPENCV_WARNINGS_ARE_ERRORS)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /WX")
endif()
if(ENABLE_LTO)
set(OPENCV_EXTRA_FLAGS_RELEASE "${OPENCV_EXTRA_FLAGS_RELEASE} /GL")
set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE} /LTCG")
endif()
if(NOT MSVC_VERSION LESS 1800 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()
endif()
# Adding additional using directory for WindowsPhone 8.0 to get Windows.winmd properly
if(WINRT_PHONE AND WINRT_8_0)
set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} /AI\$(WindowsSDK_MetadataPath)")
endif()
include(cmake/OpenCVCompilerOptimizations.cmake)
if(COMMAND ocv_compiler_optimization_options)
ocv_compiler_optimization_options()
endif()
if(COMMAND ocv_compiler_optimization_options_finalize)
ocv_compiler_optimization_options_finalize()
endif()
# set default visibility to hidden
if((CV_GCC OR CV_CLANG)
AND NOT OPENCV_SKIP_VISIBILITY_HIDDEN
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fvisibility")
add_extra_compiler_option(-fvisibility=hidden)
add_extra_compiler_option(-fvisibility-inlines-hidden)
endif()
# combine all "extra" options
if(NOT OPENCV_SKIP_EXTRA_COMPILER_FLAGS)
set(CMAKE_C_FLAGS "${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} ${OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE}")
set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_SHARED_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS_DEBUG}")
endif()
if(MSVC)
if(NOT ENABLE_NOISY_WARNINGS)
if(MSVC_VERSION EQUAL 1400)
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4510 /wd4610 /wd4312 /wd4201 /wd4244 /wd4328 /wd4267)
endif()
endif()
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 "/Zm1000" "" ${flags} "${${flags}}")
endforeach()
# Enable 'extern "C"' and asynchronous (division by zero, access violation) exceptions
if(NOT OPENCV_SKIP_MSVC_EXCEPTIONS_FLAG)
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(REGEX REPLACE " /EH[^ ]* " " " ${flags} " ${${flags}}")
endforeach()
if(NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${CMAKE_CXX_FLAGS_DEBUG}" MATCHES " /EH")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHa")
endif()
endif()
if(NOT ENABLE_NOISY_WARNINGS)
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4127) # conditional expression is constant
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())
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4275) # non dll-interface class 'std::exception' used as base for dll-interface class 'cv::Exception'
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4512) # Assignment operator could not be generated
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4589) # Constructor of abstract class 'cv::ORB' ignores initializer for virtual base class 'cv::Algorithm'
endif()
if(CV_ICC AND NOT ENABLE_NOISY_WARNINGS)
foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_DEBUG)
string(REGEX REPLACE "( |^)/W[0-9]+( |$)" "\\1\\2" ${flags} "${${flags}}")
endforeach()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Qwd673") # PCH warning
endif()
endif()
if(APPLE AND NOT CMAKE_CROSSCOMPILING AND NOT DEFINED ENV{LDFLAGS} AND EXISTS "/usr/local/lib")
link_directories("/usr/local/lib")
endif()
if(ENABLE_BUILD_HARDENING)
include(${CMAKE_CURRENT_LIST_DIR}/OpenCVCompilerDefenses.cmake)
endif()
if(MSVC)
include(cmake/OpenCVCRTLinkage.cmake)
add_definitions(-D_VARIADIC_MAX=10)
endif()
# Enable compiler options for OpenCV modules/apps/samples only (ignore 3rdparty)
macro(ocv_add_modules_compiler_options)
if(MSVC AND NOT OPENCV_SKIP_MSVC_W4_OPTION)
foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG)
string(REPLACE "/W3" "/W4" ${flags} "${${flags}}")
endforeach()
endif()
endmacro()