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OpenCVDetectCXXCompiler.cmake
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# Compilers:
# - CV_GCC - GNU compiler (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# - CV_CLANG - Clang-compatible compiler (CMAKE_CXX_COMPILER_ID MATCHES "Clang" - Clang or AppleClang, see CMP0025)
# - CV_ICC - Intel compiler
# - MSVC - Microsoft Visual Compiler (CMake variable)
# - MINGW / CYGWIN / CMAKE_COMPILER_IS_MINGW / CMAKE_COMPILER_IS_CYGWIN (CMake original variables)
#
# CPU Platforms:
# - X86 / X86_64
# - ARM - ARM CPU, not defined for AArch64
# - AARCH64 - ARMv8+ (64-bit)
# - PPC64 / PPC64LE - PowerPC
# - MIPS
#
# OS:
# - WIN32 - Windows | MINGW
# - UNIX - Linux | MacOSX | ANDROID
# - ANDROID
# - IOS
# - APPLE - MacOSX | iOS
# ----------------------------------------------------------------------------
ocv_declare_removed_variables(MINGW64 MSVC64)
# do not use (CMake variables): CMAKE_CL_64
if(NOT DEFINED CV_GCC AND CMAKE_CXX_COMPILER_ID MATCHES "GNU")
set(CV_GCC 1)
endif()
if(NOT DEFINED CV_CLANG AND CMAKE_CXX_COMPILER_ID MATCHES "Clang") # Clang or AppleClang (see CMP0025)
set(CV_CLANG 1)
set(CMAKE_COMPILER_IS_CLANGCXX 1) # TODO next release: remove this
set(CMAKE_COMPILER_IS_CLANGCC 1) # TODO next release: remove this
endif()
function(access_CMAKE_COMPILER_IS_CLANGCXX)
if(NOT OPENCV_SUPPRESS_DEPRECATIONS)
message(WARNING "DEPRECATED: CMAKE_COMPILER_IS_CLANGCXX support is deprecated in OpenCV.
Consider using:
- CV_GCC # GCC
- CV_CLANG # Clang or AppleClang (see CMP0025)
")
endif()
endfunction()
variable_watch(CMAKE_COMPILER_IS_CLANGCXX access_CMAKE_COMPILER_IS_CLANGCXX)
variable_watch(CMAKE_COMPILER_IS_CLANGCC access_CMAKE_COMPILER_IS_CLANGCXX)
# ----------------------------------------------------------------------------
# Detect Intel ICC compiler
# ----------------------------------------------------------------------------
if(UNIX)
if(__ICL)
set(CV_ICC __ICL)
elseif(__ICC)
set(CV_ICC __ICC)
elseif(__ECL)
set(CV_ICC __ECL)
elseif(__ECC)
set(CV_ICC __ECC)
elseif(__INTEL_COMPILER)
set(CV_ICC __INTEL_COMPILER)
elseif(CMAKE_C_COMPILER MATCHES "icc")
set(CV_ICC icc_matches_c_compiler)
endif()
endif()
if(MSVC AND CMAKE_C_COMPILER MATCHES "icc|icl")
set(CV_ICC __INTEL_COMPILER_FOR_WINDOWS)
endif()
if(NOT DEFINED CMAKE_CXX_COMPILER_VERSION
AND NOT OPENCV_SUPPRESS_MESSAGE_MISSING_COMPILER_VERSION)
message(WARNING "OpenCV: Compiler version is not available: CMAKE_CXX_COMPILER_VERSION is not set")
endif()
if((NOT DEFINED CMAKE_SYSTEM_PROCESSOR OR CMAKE_SYSTEM_PROCESSOR STREQUAL "")
AND NOT OPENCV_SUPPRESS_MESSAGE_MISSING_CMAKE_SYSTEM_PROCESSOR)
message(WARNING "OpenCV: CMAKE_SYSTEM_PROCESSOR is not defined. Perhaps CMake toolchain is broken")
endif()
if(NOT DEFINED CMAKE_SIZEOF_VOID_P
AND NOT OPENCV_SUPPRESS_MESSAGE_MISSING_CMAKE_SIZEOF_VOID_P)
message(WARNING "OpenCV: CMAKE_SIZEOF_VOID_P is not defined. Perhaps CMake toolchain is broken")
endif()
message(STATUS "Detected processor: ${CMAKE_SYSTEM_PROCESSOR}")
if(OPENCV_SKIP_SYSTEM_PROCESSOR_DETECTION)
# custom setup: required variables are passed through cache / CMake's command-line
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(X86_64 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "i686.*|i386.*|x86.*")
set(X86 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*|arm64.*|ARM64.*)")
set(AARCH64 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
set(ARM 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64le")
set(PPC64LE 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)64")
set(PPC64 1)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(mips.*|MIPS.*)")
set(MIPS 1)
else()
if(NOT OPENCV_SUPPRESS_MESSAGE_UNRECOGNIZED_SYSTEM_PROCESSOR)
message(WARNING "OpenCV: unrecognized target processor configuration")
endif()
endif()
# Workaround for 32-bit operating systems on x86_64
if(CMAKE_SIZEOF_VOID_P EQUAL 4 AND X86_64
AND NOT FORCE_X86_64 # deprecated (2019-12)
AND NOT OPENCV_FORCE_X86_64
)
message(STATUS "sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode")
if(X86_64)
unset(X86_64)
set(X86 1)
endif()
endif()
# Workaround for 32-bit operating systems on aarch64 processor
if(CMAKE_SIZEOF_VOID_P EQUAL 4 AND AARCH64
AND NOT OPENCV_FORCE_AARCH64
)
message(STATUS "sizeof(void) = 4 on 64 bit processor. Assume 32-bit compilation mode")
if(AARCH64)
unset(AARCH64)
set(ARM 1)
endif()
endif()
# Similar code exists in OpenCVConfig.cmake
if(NOT DEFINED OpenCV_STATIC)
# look for global setting
if(NOT DEFINED BUILD_SHARED_LIBS OR BUILD_SHARED_LIBS)
set(OpenCV_STATIC OFF)
else()
set(OpenCV_STATIC ON)
endif()
endif()
if(DEFINED OpenCV_ARCH AND DEFINED OpenCV_RUNTIME)
# custom overridden values
elseif(MSVC)
# see Modules/CMakeGenericSystem.cmake
if("${CMAKE_GENERATOR}" MATCHES "(Win64|IA64)")
set(OpenCV_ARCH "x64")
elseif("${CMAKE_GENERATOR_PLATFORM}" MATCHES "ARM64")
set(OpenCV_ARCH "ARM64")
elseif("${CMAKE_GENERATOR}" MATCHES "ARM")
set(OpenCV_ARCH "ARM")
elseif("${CMAKE_SIZEOF_VOID_P}" STREQUAL "8")
set(OpenCV_ARCH "x64")
else()
set(OpenCV_ARCH x86)
endif()
if(MSVC_VERSION EQUAL 1400)
set(OpenCV_RUNTIME vc8)
elseif(MSVC_VERSION EQUAL 1500)
set(OpenCV_RUNTIME vc9)
elseif(MSVC_VERSION EQUAL 1600)
set(OpenCV_RUNTIME vc10)
elseif(MSVC_VERSION EQUAL 1700)
set(OpenCV_RUNTIME vc11)
elseif(MSVC_VERSION EQUAL 1800)
set(OpenCV_RUNTIME vc12)
elseif(MSVC_VERSION EQUAL 1900)
set(OpenCV_RUNTIME vc14)
elseif(MSVC_VERSION MATCHES "^191[0-9]$")
set(OpenCV_RUNTIME vc15)
elseif(MSVC_VERSION MATCHES "^192[0-9]$")
set(OpenCV_RUNTIME vc16)
else()
message(WARNING "OpenCV does not recognize MSVC_VERSION \"${MSVC_VERSION}\". Cannot set OpenCV_RUNTIME")
endif()
elseif(MINGW)
set(OpenCV_RUNTIME mingw)
if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64.*|x86_64.*|AMD64.*")
set(OpenCV_ARCH x64)
else()
set(OpenCV_ARCH x86)
endif()
endif()
# Fix handling of duplicated files in the same static library:
# https://public.kitware.com/Bug/view.php?id=14874
if(CMAKE_VERSION VERSION_LESS "3.1")
foreach(var CMAKE_C_ARCHIVE_APPEND CMAKE_CXX_ARCHIVE_APPEND)
if(${var} MATCHES "^<CMAKE_AR> r")
string(REPLACE "<CMAKE_AR> r" "<CMAKE_AR> q" ${var} "${${var}}")
endif()
endforeach()
endif()
if(NOT OPENCV_SKIP_CMAKE_CXX_STANDARD)
ocv_update(CMAKE_CXX_STANDARD 11)
ocv_update(CMAKE_CXX_STANDARD_REQUIRED TRUE)
ocv_update(CMAKE_CXX_EXTENSIONS OFF) # use -std=c++11 instead of -std=gnu++11
if(CMAKE_CXX11_COMPILE_FEATURES)
set(HAVE_CXX11 ON)
endif()
endif()
if(NOT HAVE_CXX11)
ocv_check_compiler_flag(CXX "" HAVE_CXX11 "${OpenCV_SOURCE_DIR}/cmake/checks/cxx11.cpp")
if(NOT HAVE_CXX11)
ocv_check_compiler_flag(CXX "-std=c++11" HAVE_STD_CXX11 "${OpenCV_SOURCE_DIR}/cmake/checks/cxx11.cpp")
if(HAVE_STD_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
set(HAVE_CXX11 ON)
endif()
endif()
endif()
if(NOT HAVE_CXX11)
message(FATAL_ERROR "OpenCV 4.x requires C++11")
endif()
if((HAVE_CXX11
AND NOT MSVC
AND NOT (X86 OR X86_64)
AND NOT OPENCV_SKIP_LIBATOMIC_COMPILER_CHECK)
OR OPENCV_FORCE_LIBATOMIC_COMPILER_CHECK
)
ocv_check_compiler_flag(CXX "" HAVE_CXX_ATOMICS_WITHOUT_LIB "${OpenCV_SOURCE_DIR}/cmake/checks/atomic_check.cpp")
if(NOT HAVE_CXX_ATOMICS_WITHOUT_LIB)
list(APPEND CMAKE_REQUIRED_LIBRARIES atomic)
ocv_check_compiler_flag(CXX "" HAVE_CXX_ATOMICS_WITH_LIB "${OpenCV_SOURCE_DIR}/cmake/checks/atomic_check.cpp")
if(HAVE_CXX_ATOMICS_WITH_LIB)
list(APPEND OPENCV_LINKER_LIBS atomic)
else()
message(FATAL_ERROR "C++11 compiler must support std::atomic")
endif()
endif()
endif()