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opencv/cmake/OpenCVCompilerOptions.cmake
Maksim Shabunin 4c81e174bf
Merge pull request #25901 from mshabunin:fix-riscv-aarch-baseline 
RISC-V/AArch64: disable CPU features detection #25901

This PR is the first step in fixing current issues with NEON/RVV, FP16, BF16 and other CPU features on AArch64 and RISC-V platforms.

On AArch64 and RISC-V platforms we usually have the platform set by default in the toolchain when we compile it or in the cmake toolchain file or in CMAKE_CXX_FLAGS by user. Then, there are two ways to set platform options: a) "-mcpu=<some_cpu>" ; b) "-march=<arch description>" (e.g. "rv64gcv"). Furthermore, there are no similar "levels" of optimizations as for x86_64, instead we have features (RVV, FP16,...) which can be enabled or disabled. So, for example, if a user has "rv64gc" set by the toolchain and we want to enable RVV. Then we need to somehow parse their current feature set and append "v" (vector optimizations) to this string. This task is quite hard and the whole procedure is prone to errors.

I propose to use "CPU_BASELINE=DETECT" by default on AArch64 and RISC-V platforms. And somehow remove other features or make them read-only/detect-only, so that OpenCV wouldn't add any extra "-march" flags to the default configuration. We would rely only on the flags provided by the compiler and cmake toolchain file. We can have some predefined configurations in our cmake toolchain files.

Changes made by this PR:
- `CMakeLists.txt`: 
  - use `CMAKE_CROSSCOMPILING` instead of `CMAKE_TOOLCHAIN_FILE` to detect cross-compilation. This might be useful in cases of native compilation with a toolchain file
  - removed obsolete variables `ENABLE_NEON` and `ENABLE_VFPV3`, the first one have been turned ON by default on AArch64 platform which caused setting `CPU_BASELINE=NEON`
  - raise minimum cmake version allowed to 3.7 to allow using `CMAKE_CXX_FLAGS_INIT` in toolchain files
- added separate files with arch flags for native compilation on AArch64 and RISC-V, these files will be used in our toolchain files and in regular cmake
- use `DETECT` as default value for `CPU_BASELINE` also allow `NATIVE`, warn user if other values were used (only for AArch64 and RISC-V)
- for each feature listed in `CPU_DISPATCH` check if corresponding `CPU_${opt}_FLAGS_ON` has been provided, warn user if it is empty (only for AArch64 and RISC-V)
- use `CPU_BASELINE_DISABLE` variable to actually turn off macros responsible for corresponding features even if they are enabled by compiler
- removed Aarch64 feature merge procedure (it didn't support `-mcpu` and built-in `-march`)
- reworked AArch64 and two RISC-V cmake toolchain files (does not affect Android/OSX/iOS/Win):
  - use `CMAKE_CXX_FLAGS_INIT` to set compiler flags
  - use variables `ENABLE_BF16`, `ENABLE_DOTPROD`, `ENABLE_RVV`, `ENABLE_FP16` to control `-march`
  - AArch64: removed other compiler and linker flags
    - `-fdata-sections`, `-fsigned-char`, `-Wl,--no-undefined`, `-Wl,--gc-sections`   - already set by OpenCV
    - `-Wa,--noexecstack`, `-Wl,-z,noexecstack`, `-Wl,-z,relro`, `-Wl,-z,now` - can be enabled by OpenCV via `ENABLE_HARDENING`
    - `-Wno-psabi` - this option used to disable some warnings on older ARM platforms, shouldn't harm
  - ARM: removed same common flags as for AArch64, but left `-mthumb` and `--fix-cortex-a8`, `-z nocopyreloc`
2024-09-12 18:07:24 +03:00

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if("${CMAKE_CXX_COMPILER};${CMAKE_C_COMPILER};${CMAKE_CXX_COMPILER_LAUNCHER}" MATCHES "ccache")
set(OPENCV_COMPILER_IS_CCACHE 1)
endif()
if(ENABLE_CCACHE AND NOT OPENCV_COMPILER_IS_CCACHE)
# This works fine with Unix Makefiles and Ninja generators
find_host_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
message(STATUS "Looking for ccache - found (${CCACHE_PROGRAM})")
get_property(__OLD_RULE_LAUNCH_COMPILE GLOBAL PROPERTY RULE_LAUNCH_COMPILE)
if(CMAKE_GENERATOR MATCHES "Xcode")
configure_file("${CMAKE_CURRENT_LIST_DIR}/templates/xcode-launch-c.in" "${CMAKE_BINARY_DIR}/xcode-launch-c")
configure_file("${CMAKE_CURRENT_LIST_DIR}/templates/xcode-launch-cxx.in" "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
execute_process(COMMAND chmod a+rx
"${CMAKE_BINARY_DIR}/xcode-launch-c"
"${CMAKE_BINARY_DIR}/xcode-launch-cxx"
)
# Xcode project attributes
set(CMAKE_XCODE_ATTRIBUTE_CC "${CMAKE_BINARY_DIR}/xcode-launch-c")
set(CMAKE_XCODE_ATTRIBUTE_CXX "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
set(CMAKE_XCODE_ATTRIBUTE_LD "${CMAKE_BINARY_DIR}/xcode-launch-c")
set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${CMAKE_BINARY_DIR}/xcode-launch-cxx")
set(OPENCV_COMPILER_IS_CCACHE 1)
message(STATUS "ccache: enable support through Xcode project properties")
elseif(__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}=\"${value}\"")
endmacro()
# Use same flags for native AArch64 and RISC-V compilation as for cross-compile (Linux)
if(NOT CMAKE_CROSSCOMPILING AND NOT CMAKE_TOOLCHAIN_FILE AND COMMAND ocv_set_platform_flags)
unset(platform_flags)
ocv_set_platform_flags(platform_flags)
# externally-provided flags should have higher priority - prepend our flags
if(platform_flags)
set(CMAKE_CXX_FLAGS "${platform_flags} ${CMAKE_CXX_FLAGS}")
set(CMAKE_C_FLAGS "${platform_flags} ${CMAKE_C_FLAGS}")
endif()
endif()
if(NOT MSVC)
# OpenCV fails some tests when 'char' is 'unsigned' by default
add_extra_compiler_option(-fsigned-char)
endif()
if(MSVC)
if(NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " /fp:")
if(ENABLE_FAST_MATH)
add_extra_compiler_option("/fp:fast")
else()
add_extra_compiler_option("/fp:precise")
endif()
endif()
elseif(CV_ICC)
if(NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " /fp:"
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fp-model"
)
if(NOT ENABLE_FAST_MATH)
add_extra_compiler_option("-fp-model precise")
endif()
endif()
elseif(CV_ICX)
# ICX uses -ffast-math by default.
# use own flags, if no one of the flags provided by user: -fp-model, -ffast-math -fno-fast-math
if(NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " /fp:"
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fp-model"
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -ffast-math"
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fno-fast-math"
)
if(NOT ENABLE_FAST_MATH)
add_extra_compiler_option(-fno-fast-math)
add_extra_compiler_option(-fp-model=precise)
endif()
endif()
elseif(CV_GCC OR CV_CLANG)
if(ENABLE_FAST_MATH)
add_extra_compiler_option(-ffast-math)
add_extra_compiler_option(-fno-finite-math-only)
endif()
endif()
if(CV_GCC OR CV_CLANG OR CV_ICX)
# High level of warnings.
add_extra_compiler_option(-W)
if (NOT MSVC)
# clang-cl interprets -Wall as MSVC would: -Weverything, which is more than
# we want.
add_extra_compiler_option(-Wall)
endif()
add_extra_compiler_option(-Wreturn-type)
add_extra_compiler_option(-Wnon-virtual-dtor)
add_extra_compiler_option(-Waddress)
add_extra_compiler_option(-Wsequence-point)
add_extra_compiler_option(-Wformat)
add_extra_compiler_option(-Wformat-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)
if(NOT (CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "5.0"))
add_extra_compiler_option(-Wshadow) # old GCC emits warnings for variables + methods combination
endif()
add_extra_compiler_option(-Wsign-promo)
add_extra_compiler_option(-Wuninitialized)
if(CV_GCC AND (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0) AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.0 OR ARM))
add_extra_compiler_option(-Wno-psabi)
endif()
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-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()
if(CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
add_extra_compiler_option(-Wno-missing-field-initializers) # GCC 4.x emits warnings about {}, fixed in GCC 5+
endif()
if(CV_CLANG AND NOT CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
add_extra_compiler_option(-Wno-deprecated-enum-enum-conversion)
add_extra_compiler_option(-Wno-deprecated-anon-enum-enum-conversion)
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, unless we have explicitly disabled multi-thread execution.
if(NOT OPENCV_DISABLE_THREAD_SUPPORT
AND (
(UNIX
AND NOT ANDROID
AND NOT (APPLE AND CV_CLANG)
AND NOT EMSCRIPTEN
)
OR (EMSCRIPTEN AND WITH_PTHREADS_PF) # https://github.com/opencv/opencv/issues/20285
)
) # 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()
# Profiling?
if(ENABLE_PROFILING)
# 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" "" ${flags} "${${flags}}")
endforeach()
# -pg should be placed both in the linker and in the compiler settings
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pg")
add_extra_compiler_option("-pg -g")
else()
if(MSVC)
# TODO: Clang/C2 is not supported
elseif(((IOS OR ANDROID) AND NOT BUILD_SHARED_LIBS) AND NOT OPENCV_FORCE_FUNCTIONS_SECTIONS)
# don't create separate sections for functions/data, reduce package size
else()
# Remove unreferenced functions: function level linking
add_extra_compiler_option(-ffunction-sections)
add_extra_compiler_option(-fdata-sections)
if(NOT OPENCV_SKIP_GC_SECTIONS)
if(APPLE)
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} -Wl,-dead_strip")
set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} -Wl,-dead_strip")
set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} -Wl,-dead_strip")
else()
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} -Wl,--gc-sections")
set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} -Wl,--gc-sections")
set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} -Wl,--gc-sections")
endif()
endif()
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 "${CMAKE_EXE_LINKER_FLAGS} --coverage")
endif()
if(ENABLE_INSTRUMENTATION)
if(NOT HAVE_CXX11)
message(WARNING "ENABLE_INSTRUMENTATION requires C++11 support")
endif()
set(WITH_VTK OFF) # There are issues with VTK 6.0
endif()
if(ENABLE_LTO)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 12)
add_extra_compiler_option(-flto=auto)
else()
add_extra_compiler_option(-flto)
endif()
endif()
if(ENABLE_THIN_LTO)
add_extra_compiler_option(-flto=thin)
endif()
set(OPENCV_EXTRA_FLAGS_RELEASE "${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 "${OPENCV_EXTRA_SHARED_LINKER_FLAGS_RELEASE} /debug")
set(OPENCV_EXTRA_MODULE_LINKER_FLAGS_RELEASE "${OPENCV_EXTRA_MODULE_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 "${OPENCV_EXTRA_CXX_FLAGS} /FS")
endif()
if(AARCH64 AND NOT MSVC_VERSION LESS 1930)
set(OPENCV_EXTRA_FLAGS "${OPENCV_EXTRA_FLAGS} /D _ARM64_DISTINCT_NEON_TYPES")
endif()
endif()
if(PROJECT_NAME STREQUAL "OpenCV")
include("${OpenCV_SOURCE_DIR}/cmake/OpenCVCompilerOptimizations.cmake")
endif()
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 OR CV_ICX)
AND NOT MSVC
AND NOT OPENCV_SKIP_VISIBILITY_HIDDEN
AND NOT " ${CMAKE_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS} ${OPENCV_EXTRA_CXX_FLAGS}" MATCHES " -fvisibility")
add_extra_compiler_option(-fvisibility=hidden)
add_extra_compiler_option(-fvisibility-inlines-hidden)
endif()
# workaround gcc bug for aligned ld/st
# https://github.com/opencv/opencv/issues/13211
if((PPC64LE AND NOT CMAKE_CROSSCOMPILING) OR OPENCV_FORCE_COMPILER_CHECK_VSX_ALIGNED)
ocv_check_runtime_flag("${CPU_BASELINE_FLAGS}" OPENCV_CHECK_VSX_ALIGNED "${OpenCV_SOURCE_DIR}/cmake/checks/runtime/cpu_vsx_aligned.cpp")
if(NOT OPENCV_CHECK_VSX_ALIGNED)
add_extra_compiler_option_force(-DCV_COMPILER_VSX_BROKEN_ALIGNED)
endif()
endif()
# validate inline asm with fixes register number and constraints wa, wd, wf
if(PPC64LE)
ocv_check_compiler_flag(CXX "${CPU_BASELINE_FLAGS}" OPENCV_CHECK_VSX_ASM "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_vsx_asm.cpp")
if(NOT OPENCV_CHECK_VSX_ASM)
add_extra_compiler_option_force(-DCV_COMPILER_VSX_BROKEN_ASM)
endif()
endif()
# Apply "-Wl,--as-needed" linker flags: https://github.com/opencv/opencv/issues/7001
if(NOT OPENCV_SKIP_LINK_AS_NEEDED)
if(UNIX AND (NOT APPLE OR NOT CMAKE_VERSION VERSION_LESS "3.2"))
set(_option "-Wl,--as-needed")
set(_saved_CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${_option}") # requires CMake 3.2+ and CMP0056
ocv_check_compiler_flag(CXX "" HAVE_LINK_AS_NEEDED)
set(CMAKE_EXE_LINKER_FLAGS "${_saved_CMAKE_EXE_LINKER_FLAGS}")
if(HAVE_LINK_AS_NEEDED)
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} ${_option}")
set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} ${_option}")
set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} ${_option}")
endif()
endif()
endif()
# Apply "-Wl,--no-undefined" linker flags: https://github.com/opencv/opencv/pull/21347
if(NOT OPENCV_SKIP_LINK_NO_UNDEFINED)
if(UNIX AND ((NOT APPLE OR NOT CMAKE_VERSION VERSION_LESS "3.2") AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD"))
set(_option "-Wl,--no-undefined")
set(_saved_CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${_option}") # requires CMake 3.2+ and CMP0056
ocv_check_compiler_flag(CXX "" HAVE_LINK_NO_UNDEFINED)
set(CMAKE_EXE_LINKER_FLAGS "${_saved_CMAKE_EXE_LINKER_FLAGS}")
if(HAVE_LINK_NO_UNDEFINED)
set(OPENCV_EXTRA_EXE_LINKER_FLAGS "${OPENCV_EXTRA_EXE_LINKER_FLAGS} ${_option}")
set(OPENCV_EXTRA_SHARED_LINKER_FLAGS "${OPENCV_EXTRA_SHARED_LINKER_FLAGS} ${_option}")
set(OPENCV_EXTRA_MODULE_LINKER_FLAGS "${OPENCV_EXTRA_MODULE_LINKER_FLAGS} ${_option}")
endif()
endif()
endif()
# combine all "extra" options
if(NOT OPENCV_SKIP_EXTRA_COMPILER_FLAGS)
set(CMAKE_C_FLAGS "${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} ${OPENCV_EXTRA_SHARED_LINKER_FLAGS_DEBUG}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${OPENCV_EXTRA_MODULE_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS_RELEASE "${CMAKE_MODULE_LINKER_FLAGS_RELEASE} ${OPENCV_EXTRA_MODULE_LINKER_FLAGS_RELEASE}")
set(CMAKE_MODULE_LINKER_FLAGS_DEBUG "${CMAKE_MODULE_LINKER_FLAGS_DEBUG} ${OPENCV_EXTRA_MODULE_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()
# Enable [[attribute]] syntax checking to prevent silent failure: "attribute is ignored in this syntactic position"
add_extra_compiler_option("/w15240")
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'
ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4819) # Symbols like delta or epsilon cannot be represented
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_CURRENT_LIST_DIR}/OpenCVCRTLinkage.cmake")
add_definitions(-D_VARIADIC_MAX=10)
endif()
if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
get_directory_property(__DIRECTORY_COMPILE_DEFINITIONS COMPILE_DEFINITIONS)
if((NOT " ${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} ${OPENCV_EXTRA_CXX_FLAGS} ${OPENCV_EXTRA_FLAGS_RELEASE} ${__DIRECTORY_COMPILE_DEFINITIONS}" MATCHES "_WIN32_WINNT"
AND NOT OPENCV_CMAKE_SKIP_MACRO_WIN32_WINNT)
OR OPENCV_CMAKE_FORCE_MACRO_WIN32_WINNT
)
# https://docs.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt
# Target Windows 7 API
set(OPENCV_CMAKE_MACRO_WIN32_WINNT "0x0601" CACHE STRING "Value of _WIN32_WINNT macro")
add_definitions(-D_WIN32_WINNT=${OPENCV_CMAKE_MACRO_WIN32_WINNT})
endif()
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" ${flags} "${${flags}}")
endforeach()
endif()
if(OPENCV_ENABLE_MEMORY_SANITIZER)
add_definitions(-DOPENCV_ENABLE_MEMORY_SANITIZER=1)
endif()
endmacro()
# adjust -Wl,-rpath-link
if(CMAKE_SKIP_RPATH)
if((NOT CMAKE_CROSSCOMPILING OR OPENCV_ENABLE_LINKER_RPATH_LINK_ORIGIN) AND NOT OPENCV_SKIP_LINKER_RPATH_LINK_ORIGIN)
if(DEFINED CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN)
list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${CMAKE_SHARED_LIBRARY_RPATH_ORIGIN_TOKEN}")
else()
list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "\$ORIGIN")
endif()
elseif(NOT OPENCV_SKIP_LINKER_RPATH_LINK_BINARY_LIB)
list(APPEND CMAKE_PLATFORM_RUNTIME_PATH "${LIBRARY_OUTPUT_PATH}")
endif()
endif()
if(OPENCV_EXTRA_RPATH_LINK_PATH)
string(REPLACE ":" ";" OPENCV_EXTRA_RPATH_LINK_PATH_ "${OPENCV_EXTRA_RPATH_LINK_PATH}")
list(APPEND CMAKE_PLATFORM_RUNTIME_PATH ${OPENCV_EXTRA_RPATH_LINK_PATH_})
if(NOT CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG)
message(WARNING "OPENCV_EXTRA_RPATH_LINK_PATH may not work properly because CMAKE_EXECUTABLE_RPATH_LINK_CXX_FLAG is not defined (not supported)")
endif()
endif()
# Control MSVC /MP flag
# Input variables: OPENCV_MSVC_PARALLEL (ON,1,2,3,...) + OPENCV_SKIP_MSVC_PARALLEL
# Details:
# - https://docs.microsoft.com/en-us/cpp/build/reference/mp-build-with-multiple-processes
# - https://docs.microsoft.com/en-us/cpp/build/reference/cl-environment-variables
# - https://gitlab.kitware.com/cmake/cmake/merge_requests/1718/diffs
if(CMAKE_GENERATOR MATCHES "Visual Studio" AND CMAKE_CXX_COMPILER_ID MATCHES "MSVC|Intel")
ocv_check_environment_variables(OPENCV_SKIP_MSVC_PARALLEL)
if(OPENCV_SKIP_MSVC_PARALLEL)
# nothing
elseif(" ${CMAKE_CXX_FLAGS}" MATCHES "/MP")
# nothing, already defined in compiler flags
elseif(DEFINED ENV{CL} AND " $ENV{CL}" MATCHES "/MP")
# nothing, compiler will use CL environment variable
elseif(DEFINED ENV{_CL_} AND " $ENV{_CL_}" MATCHES "/MP")
# nothing, compiler will use _CL_ environment variable
else()
ocv_check_environment_variables(OPENCV_MSVC_PARALLEL)
set(_mp_value "ON")
if(DEFINED OPENCV_MSVC_PARALLEL)
set(_mp_value "${OPENCV_MSVC_PARALLEL}")
endif()
set(OPENCV_MSVC_PARALLEL "${_mp_value}" CACHE STRING "Control MSVC /MP flag")
if(_mp_value)
if(_mp_value GREATER 0)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP${_mp_value}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP${_mp_value}")
else()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /MP")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
endif()
endif()
endif()
endif()
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