c++ - 使用 cmake 制作一个没有 sse 支持的库(windows 版本)

Question

我想使用 CMake 为 Visual Studio 2019 设置 OpenCV。在调试我的程序时完成所有这些过程后，我收到此错误:

yaabolfazl.exe 中 0x00007FFCF1FF2382 (opencv_world412d.dll) 处的未处理异常:0xC000001D:非法指令。发生了。

我认为这是由于我的处理器不支持 AVX(Windows 8.1，core i5 M520 2.4GHz)造成的。 (我对吗？)我发现我可以通过使用 CPU_DISPATCH 和 CPU_BASELINE 选项使用不支持 AVX 的 CMake 制作新版本的 OpenCV，但是当我改变它们的值时，我得到这个错误:

配置过程出错，工程文件可能无效。

那么如何在没有 AVX 支持的情况下使用 CMake 构建 OpenCV(例如，仅使用 SSE 支持)？

我的 CMake 配置

CPU指令集:

Answer 1

问题很可能是您的 CPU 不支持 OpenCV 使用的某些 CPU 功能(如 AVX)。我不确定在构建 OpenCV 时禁用这些功能的确切 CMake 标志是什么，但是还有另一种方法可以解决这个问题(蛮力方法 :D)。从 this link 下载 OpenCV 源代码并解压(目前最新版本是4.1.1)。转到 opencv-4.1.1\cmake 文件夹并在文本编辑器中打开 OpenCVCompilerOptimizations.cmake。它包含针对不同 CPU 架构的优化。问题中附带的屏幕截图显示了您的 CPU 支持的指令。在 OpenCVCompilerOptimizations.cmake 文件中，只需删除(或注释掉)您的 CPU 不支持的每个指令选项。这是我的版本(我只包括修改所在的文件的前半部分。将其与原始文件进行比较以查看差异):

# x86/x86-64 arch:
# SSE / SSE2 (always available on 64-bit CPUs)
# SSE3 / SSSE3
# SSE4_1 / SSE4_2 / POPCNT
# AVX / AVX2 / AVX_512F
# FMA3
#
# CPU features groups:
# AVX512_COMMON (Common instructions AVX-512F/CD for all CPUs that support AVX-512)
# AVX512_KNL (Knights Landing with AVX-512F/CD/ER/PF)
# AVX512_KNM (Knights Mill with AVX-512F/CD/ER/PF/4FMAPS/4VNNIW/VPOPCNTDQ)
# AVX512_SKX (Skylake-X with AVX-512F/CD/BW/DQ/VL)
# AVX512_CNL (Cannon Lake with AVX-512F/CD/BW/DQ/VL/IFMA/VBMI)
# AVX512_CEL (Cascade Lake with AVX-512F/CD/BW/DQ/VL/IFMA/VBMI/VNNI)
# AVX512_ICL (Ice Lake with AVX-512F/CD/BW/DQ/VL/IFMA/VBMI/VNNI/VBMI2/BITALG/VPOPCNTDQ/VPCLMULQDQ*/GFNI*/VAES*)

# ppc64le arch:
# VSX  (always available on Power8)
# VSX3 (always available on Power9)

# CPU_{opt}_SUPPORTED=ON/OFF - compiler support (possibly with additional flag)
# CPU_{opt}_IMPLIES=<list>
# CPU_{opt}_FORCE=<list> - subset of "implies" list
# CPU_{opt}_GROUP=<list> - similar to "implies" list, but additionally merges compiler flags
# CPU_{opt}_FLAGS_ON=""
# CPU_{opt}_FEATURE_ALIAS - mapping to CV_CPU_* HWFeature enum

# Input variables:
# CPU_BASELINE=<list> - preferred list of baseline optimizations
# CPU_DISPATCH=<list> - preferred list of dispatched optimizations

# Advanced input variables:
# CPU_BASELINE_REQUIRE=<list> - list of required baseline optimizations
# CPU_DISPATCH_REQUIRE=<list> - list of required dispatched optimizations
# CPU_BASELINE_DISABLE=<list> - list of disabled baseline optimizations

# Output variables:
# CPU_BASELINE_FINAL=<list> - final list of enabled compiler optimizations
# CPU_DISPATCH_FINAL=<list> - final list of dispatched optimizations
#
# CPU_DISPATCH_FLAGS_${opt} - flags for source files compiled separately (<name>.avx2.cpp)
#
# CPU_{opt}_ENABLED_DEFAULT=ON/OFF - has compiler support without additional flag (CPU_BASELINE_DETECT=ON only)

set(CPU_ALL_OPTIMIZATIONS "SSE;SSE2;SSE3;SSSE3;SSE4_1;SSE4_2")
##list(APPEND CPU_ALL_OPTIMIZATIONS "AVX512_COMMON;AVX512_KNL;AVX512_KNM;AVX512_SKX;AVX512_CNL;AVX512_CEL;AVX512_ICL")
##list(APPEND CPU_ALL_OPTIMIZATIONS NEON VFPV3 FP16)
##list(APPEND CPU_ALL_OPTIMIZATIONS VSX VSX3)
list(REMOVE_DUPLICATES CPU_ALL_OPTIMIZATIONS)

ocv_update(CPU_VFPV3_FEATURE_ALIAS "")


set(HELP_CPU_BASELINE "Specify list of enabled baseline CPU optimizations")
set(HELP_CPU_BASELINE_REQUIRE "Specify list of required baseline CPU optimizations")
set(HELP_CPU_BASELINE_DISABLE "Specify list of forbidden baseline CPU optimizations")
set(HELP_CPU_DISPATCH "Specify list of dispatched CPU optimizations")
set(HELP_CPU_DISPATCH_REQUIRE "Specify list of required dispatched CPU optimizations")

foreach(var CPU_BASELINE CPU_BASELINE_REQUIRE CPU_BASELINE_DISABLE CPU_DISPATCH CPU_DISPATCH_REQUIRE)
  if(DEFINED ${var})
    string(REPLACE "," ";" _list "${${var}}")
    set(${var} "${_list}" CACHE STRING "${HELP_${var}}" FORCE)
  endif()
endforeach()

# process legacy flags
macro(ocv_optimization_process_obsolete_option legacy_flag OPT legacy_warn)
  if(DEFINED "${legacy_flag}")
    if("${legacy_warn}")
      message(STATUS "WARNING: Option ${legacy_flag}='${${legacy_flag}}' is deprecated and should not be used anymore")
      message(STATUS "         Behaviour of this option is not backward compatible")
      message(STATUS "         Refer to 'CPU_BASELINE'/'CPU_DISPATCH' CMake options documentation")
    endif()
    if("${${legacy_flag}}")
      if(NOT ";${CPU_BASELINE_REQUIRE};" MATCHES ";${OPT};")
        set(CPU_BASELINE_REQUIRE "${CPU_BASELINE_REQUIRE};${OPT}" CACHE STRING "${HELP_CPU_BASELINE_REQUIRE}" FORCE)
      endif()
    else()
      if(NOT ";${CPU_BASELINE_DISABLE};" MATCHES ";${OPT};")
        set(CPU_BASELINE_DISABLE "${CPU_BASELINE_DISABLE};${OPT}" CACHE STRING "${HELP_CPU_BASELINE_DISABLE}" FORCE)
      endif()
    endif()
  endif()
endmacro()
ocv_optimization_process_obsolete_option(ENABLE_SSE SSE ON)
ocv_optimization_process_obsolete_option(ENABLE_SSE2 SSE2 ON)
ocv_optimization_process_obsolete_option(ENABLE_SSE3 SSE3 ON)
ocv_optimization_process_obsolete_option(ENABLE_SSSE3 SSSE3 ON)
ocv_optimization_process_obsolete_option(ENABLE_SSE41 SSE4_1 ON)
ocv_optimization_process_obsolete_option(ENABLE_SSE42 SSE4_2 ON)
# ocv_optimization_process_obsolete_option(ENABLE_POPCNT POPCNT ON)
# ocv_optimization_process_obsolete_option(ENABLE_AVX AVX OFF)
# ocv_optimization_process_obsolete_option(ENABLE_AVX2 AVX2 OFF)
#ocv_optimization_process_obsolete_option(ENABLE_FMA3 FMA3 ON)

# ocv_optimization_process_obsolete_option(ENABLE_VFPV3 VFPV3 OFF)
# ocv_optimization_process_obsolete_option(ENABLE_NEON NEON OFF)

# ocv_optimization_process_obsolete_option(ENABLE_VSX VSX ON)

macro(ocv_is_optimization_in_list resultvar check_opt)
  set(__checked "")
  set(__queue ${ARGN})
  set(${resultvar} 0)
  while(__queue AND NOT ${resultvar})
    list(REMOVE_DUPLICATES __queue)
    set(__queue_current ${__queue})
    set(__queue "")
    foreach(OPT ${__queue_current})
      if("x${OPT}" STREQUAL "x${check_opt}")
        set(${resultvar} 1)
        break()
      elseif(NOT ";${__checked};" MATCHES ";${OPT};")
        list(APPEND __queue ${CPU_${OPT}_IMPLIES})
      endif()
      list(APPEND __checked ${OPT})
    endforeach()
  endwhile()
endmacro()

macro(ocv_is_optimization_in_force_list resultvar check_opt)
  set(__checked "")
  set(__queue ${ARGN})
  set(${resultvar} 0)
  while(__queue AND NOT ${resultvar})
    list(REMOVE_DUPLICATES __queue)
    set(__queue_current ${__queue})
    set(__queue "")
    foreach(OPT ${__queue_current})
      if(OPT STREQUAL "${check_opt}")
        set(${resultvar} 1)
        break()
      elseif(NOT ";${__checked};" MATCHES ";${OPT};")
        list(APPEND __queue ${CPU_${OPT}_FORCE})
      endif()
      list(APPEND __checked ${OPT})
    endforeach()
  endwhile()
endmacro()

macro(ocv_append_optimization_flag var OPT)
  if(CPU_${OPT}_FLAGS_CONFLICT)
    string(REGEX REPLACE " ${CPU_${OPT}_FLAGS_CONFLICT}" "" ${var} " ${${var}} ")
    string(REGEX REPLACE "^ +" "" ${var} "${${var}}")
  endif()
  set(${var} "${${var}} ${CPU_${OPT}_FLAGS_ON}")
endmacro()

# Support GCC -march=native or Intel Compiler -xHost flags
if(";${CPU_BASELINE};" MATCHES ";NATIVE;" OR ";${CPU_BASELINE};" MATCHES ";HOST;")
  set(CPU_BASELINE_DETECT ON)
  set(_add_native_flag ON)
elseif(";${CPU_BASELINE};" MATCHES ";DETECT;")
  set(CPU_BASELINE_DETECT ON)
elseif(" ${CMAKE_CXX_FLAGS} " MATCHES " -march=native | -xHost | /QxHost ")
  if(DEFINED CPU_BASELINE)
    message(STATUS "CPU: Detected '-march=native' or '-xHost' compiler flag. Force CPU_BASELINE=DETECT.")
  endif()
  set(CPU_BASELINE "DETECT" CACHE STRING "${HELP_CPU_BASELINE}")
  set(CPU_BASELINE_DETECT ON)
endif()

if(X86 OR X86_64)
  ocv_update(CPU_KNOWN_OPTIMIZATIONS "SSE;SSE2;SSE3;SSSE3;SSE4_1;SSE4_2")

  # ocv_update(CPU_AVX512_COMMON_GROUP "AVX_512F;AVX_512CD")
  # ocv_update(CPU_AVX512_KNL_GROUP "AVX512_COMMON;AVX512_KNL_EXTRA")
  # ocv_update(CPU_AVX512_KNM_GROUP "AVX512_KNL;AVX512_KNM_EXTRA;AVX_512VPOPCNTDQ")
  # ocv_update(CPU_AVX512_SKX_GROUP "AVX512_COMMON;AVX_512VL;AVX_512BW;AVX_512DQ")
  # ocv_update(CPU_AVX512_CNL_GROUP "AVX512_SKX;AVX_512IFMA;AVX_512VBMI")
  # ocv_update(CPU_AVX512_CEL_GROUP "AVX512_CNL;AVX_512VNNI")
  # ocv_update(CPU_AVX512_ICL_GROUP "AVX512_CEL;AVX_512VBMI2;AVX_512BITALG;AVX_512VPOPCNTDQ") # ? VPCLMULQDQ, GFNI, VAES

  ocv_update(CPU_SSE_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_sse.cpp")
  ocv_update(CPU_SSE2_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_sse2.cpp")
  ocv_update(CPU_SSE3_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_sse3.cpp")
  ocv_update(CPU_SSSE3_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_ssse3.cpp")
  ocv_update(CPU_SSE4_1_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_sse41.cpp")
  ocv_update(CPU_SSE4_2_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_sse42.cpp")
  # ocv_update(CPU_POPCNT_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_popcnt.cpp")
  # ocv_update(CPU_AVX_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx.cpp")
  # ocv_update(CPU_AVX2_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx2.cpp")
  # ocv_update(CPU_FP16_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_fp16.cpp")
  # ocv_update(CPU_AVX_512F_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512.cpp")
  # ocv_update(CPU_AVX512_COMMON_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512common.cpp")
  # ocv_update(CPU_AVX512_KNL_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512knl.cpp")
  # ocv_update(CPU_AVX512_KNM_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512knm.cpp")
  # ocv_update(CPU_AVX512_SKX_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512skx.cpp")
  # ocv_update(CPU_AVX512_CNL_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512cnl.cpp")
  # ocv_update(CPU_AVX512_CEL_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512cel.cpp")
  # ocv_update(CPU_AVX512_ICL_TEST_FILE "${OpenCV_SOURCE_DIR}/cmake/checks/cpu_avx512icl.cpp")

  if(NOT OPENCV_CPU_OPT_IMPLIES_IGNORE)
    # ocv_update(CPU_AVX512_ICL_IMPLIES "AVX512_CEL")
    # ocv_update(CPU_AVX512_CEL_IMPLIES "AVX512_CNL")
    # ocv_update(CPU_AVX512_CNL_IMPLIES "AVX512_SKX")
    # ocv_update(CPU_AVX512_SKX_IMPLIES "AVX512_COMMON")
    # ocv_update(CPU_AVX512_KNM_IMPLIES "AVX512_KNL")
    # ocv_update(CPU_AVX512_KNL_IMPLIES "AVX512_COMMON")
    # ocv_update(CPU_AVX512_COMMON_IMPLIES "AVX_512F")
    # ocv_update(CPU_AVX_512F_IMPLIES "AVX2")
    # ocv_update(CPU_AVX_512F_FORCE "") # Don't force other optimizations
    # ocv_update(CPU_AVX2_IMPLIES "AVX;FMA3;FP16")
    # ocv_update(CPU_FMA3_IMPLIES "AVX2")
    # ocv_update(CPU_FMA3_FORCE "") # Don't force other optimizations
    # ocv_update(CPU_FP16_IMPLIES "AVX")
    # ocv_update(CPU_FP16_FORCE "") # Don't force other optimizations
    # ocv_update(CPU_AVX_IMPLIES "SSE4_2")
    ###ocv_update(CPU_SSE4_2_IMPLIES "SSE4_1;POPCNT")
    ocv_update(CPU_SSE4_2_IMPLIES "SSE4_1")
    ocv_update(CPU_POPCNT_IMPLIES "SSE4_1")
    ocv_update(CPU_POPCNT_FORCE "") # Don't force other optimizations
    ocv_update(CPU_SSE4_1_IMPLIES "SSE3;SSSE3")
    ocv_update(CPU_SSSE3_IMPLIES "SSE3")
    ocv_update(CPU_SSE3_IMPLIES "SSE2")
    ocv_update(CPU_SSE2_IMPLIES "SSE")
  endif()

  if(CV_ICC)
    macro(ocv_intel_compiler_optimization_option name unix_flags msvc_flags)
      ocv_update(CPU_${name}_FLAGS_NAME "${name}")
      if(MSVC)
        set(enable_flags "${msvc_flags}")
        set(flags_conflict "/arch:[^ ]*|/Qx:[^ ]+")
      else()
        set(enable_flags "${unix_flags}")
        set(flags_conflict "-msse[^ ]*|-mssse3|-mavx[^ ]*|-march[^ ]*|-x[^ ]+")
      endif()
      ocv_update(CPU_${name}_FLAGS_ON "${enable_flags}")
      if(flags_conflict)
        ocv_update(CPU_${name}_FLAGS_CONFLICT "${flags_conflict}")
      endif()
    endmacro()
    # ocv_intel_compiler_optimization_option(AVX2 "-march=core-avx2" "/arch:CORE-AVX2")
    # ocv_intel_compiler_optimization_option(FP16 "-mavx" "/arch:AVX")
    # ocv_intel_compiler_optimization_option(AVX "-mavx" "/arch:AVX")
    # ocv_intel_compiler_optimization_option(FMA3 "" "")
    # ocv_intel_compiler_optimization_option(POPCNT "" "")
    ocv_intel_compiler_optimization_option(SSE4_2 "-msse4.2" "/arch:SSE4.2")
    ocv_intel_compiler_optimization_option(SSE4_1 "-msse4.1" "/arch:SSE4.1")
    ocv_intel_compiler_optimization_option(SSE3 "-msse3" "/arch:SSE3")
    ocv_intel_compiler_optimization_option(SSSE3 "-mssse3" "/arch:SSSE3")
    ocv_intel_compiler_optimization_option(SSE2 "-msse2" "/arch:SSE2")
    if(NOT X86_64) # x64 compiler doesn't support /arch:sse
      ocv_intel_compiler_optimization_option(SSE "-msse" "/arch:SSE")
    endif()
    # ocv_intel_compiler_optimization_option(AVX_512F "-xCOMMON-AVX512" "/Qx:COMMON-AVX512")
    # ocv_intel_compiler_optimization_option(AVX512_COMMON "-xCOMMON-AVX512" "/Qx:COMMON-AVX512")
    # ocv_intel_compiler_optimization_option(AVX512_KNL "-xKNL" "/Qx:KNL")
    # ocv_intel_compiler_optimization_option(AVX512_KNM "-xKNM" "/Qx:KNM")
    # ocv_intel_compiler_optimization_option(AVX512_SKX "-xSKYLAKE-AVX512" "/Qx:SKYLAKE-AVX512")
    # ocv_intel_compiler_optimization_option(AVX512_CNL "-xCANNONLAKE" "/Qx:CANNONLAKE")
    # ocv_intel_compiler_optimization_option(AVX512_CEL "-xCASCADELAKE" "/Qx:CASCADELAKE")
    # ocv_intel_compiler_optimization_option(AVX512_ICL "-xICELAKE-CLIENT" "/Qx:ICELAKE-CLIENT")
  elseif(CV_GCC OR CV_CLANG)
    # ocv_update(CPU_AVX2_FLAGS_ON "-mavx2")
    # ocv_update(CPU_FP16_FLAGS_ON "-mf16c")
    # ocv_update(CPU_AVX_FLAGS_ON "-mavx")
    # ocv_update(CPU_FMA3_FLAGS_ON "-mfma")
    # ocv_update(CPU_POPCNT_FLAGS_ON "-mpopcnt")
    ocv_update(CPU_SSE4_2_FLAGS_ON "-msse4.2")
    ocv_update(CPU_SSE4_1_FLAGS_ON "-msse4.1")
    ocv_update(CPU_SSE3_FLAGS_ON "-msse3")
    ocv_update(CPU_SSSE3_FLAGS_ON "-mssse3")
    ocv_update(CPU_SSE2_FLAGS_ON "-msse2")
    ocv_update(CPU_SSE_FLAGS_ON "-msse")
    # if(NOT (CV_GCC AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "5.0"))  # GCC >= 5.0
      # # ocv_update(CPU_AVX_512F_FLAGS_ON "-mavx512f")
      # # ocv_update(CPU_AVX_512CD_FLAGS_ON "-mavx512cd")
      # # ocv_update(CPU_AVX512_KNL_EXTRA_FLAGS_ON "-mavx512er -mavx512pf")
      # # ocv_update(CPU_AVX512_KNM_EXTRA_FLAGS_ON "-mavx5124fmaps -mavx5124vnniw")
      # # ocv_update(CPU_AVX_512BW_FLAGS_ON "-mavx512bw")
      # # ocv_update(CPU_AVX_512DQ_FLAGS_ON "-mavx512dq")
      # # ocv_update(CPU_AVX_512VL_FLAGS_ON "-mavx512vl")
      # # ocv_update(CPU_AVX_512IFMA_FLAGS_ON "-mavx512ifma")
      # # ocv_update(CPU_AVX_512VBMI_FLAGS_ON "-mavx512vbmi")
      # # ocv_update(CPU_AVX_512VNNI_FLAGS_ON "-mavx512vnni")
      # # ocv_update(CPU_AVX_512VBMI2_FLAGS_ON "-mavx512vbmi2")
      # # ocv_update(CPU_AVX_512BITALG_FLAGS_ON "-mavx512bitalg")
      # # ocv_update(CPU_AVX_512VPOPCNTDQ_FLAGS_ON "-mavx512vpopcntdq")
    # else()
      # ocv_update(CPU_AVX_512F_SUPPORTED OFF)
    # endif()
  elseif(MSVC)
    # ocv_update(CPU_AVX2_FLAGS_ON "/arch:AVX2")
    # ocv_update(CPU_AVX_FLAGS_ON "/arch:AVX")
    # ocv_update(CPU_FP16_FLAGS_ON "/arch:AVX")
    if(NOT MSVC64)
      # 64-bit MSVC compiler uses SSE/SSE2 by default
      ocv_update(CPU_SSE_FLAGS_ON "/arch:SSE")
      ocv_update(CPU_SSE_SUPPORTED ON)
      ocv_update(CPU_SSE2_FLAGS_ON "/arch:SSE2")
      ocv_update(CPU_SSE2_SUPPORTED ON)
    else()
      ocv_update(CPU_SSE_SUPPORTED ON)
      ocv_update(CPU_SSE2_SUPPORTED ON)
      # ocv_update(CPU_AVX_512F_FLAGS_ON "/arch:AVX512")
    endif()
    # Other instruction sets are supported by default since MSVC 2008 at least
  else()
    message(WARNING "TODO: Unsupported compiler")
  endif()

  # if(NOT DEFINED CPU_DISPATCH)
    # if(X86_64)
      # set(CPU_DISPATCH "SSE4_1;SSE4_2;AVX;FP16;AVX2;AVX512_SKX" CACHE STRING "${HELP_CPU_DISPATCH}")
    # else()
      # set(CPU_DISPATCH "SSE4_1;SSE4_2;AVX;FP16" CACHE STRING "${HELP_CPU_DISPATCH}")
    # endif()
  # endif()

  if(NOT DEFINED CPU_BASELINE)
    if(APPLE)
      # MacOS X has limited set of possible supported H/W, so compiler is configured well
      set(CPU_BASELINE "DETECT" CACHE STRING "${HELP_CPU_BASELINE}")
    elseif(X86_64)
      set(CPU_BASELINE "SSE3" CACHE STRING "${HELP_CPU_BASELINE}")
    else()
      set(CPU_BASELINE "SSE2" CACHE STRING "${HELP_CPU_BASELINE}")
    endif()
  endif()

之后，您只需使用 CMake 构建 OpenCV。这是我的做法:

1. 转到 opencv-4.1.1 文件夹并创建一个新文件夹，我们将其命名为 build
2. 打开命令提示符或 PowerShell 窗口并导航至 build 文件夹(或只需按 Shif+右键单击 并选择在此处打开 PowerShell 窗口)

3. 执行以下命令(我已禁用构建示例和测试，因为其中一些会失败)(不要忘记命令末尾的 ..!)(对于 Visual Studio 2019 替换 “Visual Studio 15 2017” 与 “Visual Studio 16 2019”):

   cmake -D ENABLE_AVX=OFF -D ENABLE_AVX2=OFF -D BUILD_EXAMPLES=OFF -D BUILD_DOCS=OFF -D BUILD_PERF_TESTS=OFF -D BUILD_TESTS=OFF -G "Visual Studio 15 2017"..

4. CMake 完成生成项目后，使用 Visual Studio 打开构建文件夹中的解决方案文件 (OpenCV.sln)

5. 构建ALL_BUILD项目

6. 一个项目会失败。如果您查看错误，它会显示类似'CV_CPU_HAS_SUPPORT_AVX512_SKX': undeclared identifier 只需将代码中的关键字 CV_CPU_HAS_SUPPORT_AVX512_SKX 替换为 false(它显示整个解决方案中的 3 次，替换所有 3) 并再次点击 build on ALL_BUILD

7. 构建INSTALL 项目。它将在我们的构建文件夹中创建一个名为 install 的文件夹。

8. 使用项目中 install 文件夹中新构建的 OpenCV 库、二进制文件和包含项，它应该可以工作。