交叉编译：尝试为 Windows 编译 OpenCV 项目时出错

Question

我正在尝试使用 cmake 从我的 GNU/Linux 机器（64 位，Debian Jessie）编译适用于 Windows 的 C++/OpenCV 项目。 我的编译器是 mingw，因此我使用以下工具链启动 cmake：

# the name of the target operating system
SET(CMAKE_SYSTEM_NAME Windows)
set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
set(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")

# which compilers to use for C and C++
SET(CMAKE_C_COMPILER i686-w64-mingw32-gcc)
SET(CMAKE_CXX_COMPILER i686-w64-mingw32-g++)
SET(CMAKE_RC_COMPILER i586-mingw32-windres)
SET(CUDA_TOOLKIT_ROOT_DIR /usr/bin/nvcc)


# here is the target environment located
SET(CMAKE_FIND_ROOT_PATH /usr/i686-mingw32)

# adjust the default behaviour of the FIND_XXX() commands:
# search headers and libraries in the target environment, search 
# programs in the host environment
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

但是cmake返回如下错误：

-- The C compiler identification is GNU 4.9.1
-- The CXX compiler identification is GNU 4.9.1
-- Check for working C compiler: /usr/bin/x86_64-w64-mingw32-gcc
-- Check for working C compiler: /usr/bin/x86_64-w64-mingw32-gcc -- broken
CMake Error at /usr/share/cmake-3.0/Modules/CMakeTestCCompiler.cmake:61 (message):
  The C compiler "/usr/bin/x86_64-w64-mingw32-gcc" is not able to compile a
  simple test program.

  It fails with the following output:

   Change Dir: /data/These/1_A/programmes/remanence/online_version_win32/CMakeFiles/CMakeTmp



  Run Build Command:"/usr/bin/make" "cmTryCompileExec3184109505/fast"

  /usr/bin/make -f CMakeFiles/cmTryCompileExec3184109505.dir/build.make
  CMakeFiles/cmTryCompileExec3184109505.dir/build

  make[1]: Entering directory
  '/data/These/1_A/programmes/remanence/online_version_win32/CMakeFiles/CMakeTmp'


  /usr/bin/cmake -E cmake_progress_report
  /data/These/1_A/programmes/remanence/online_version_win32/CMakeFiles/CMakeTmp/CMakeFiles
  1

  Building C object
  CMakeFiles/cmTryCompileExec3184109505.dir/testCCompiler.c.o

  /usr/bin/x86_64-w64-mingw32-gcc -o
  CMakeFiles/cmTryCompileExec3184109505.dir/testCCompiler.c.o -c
  /data/These/1_A/programmes/remanence/online_version_win32/CMakeFiles/CMakeTmp/testCCompiler.c


  Linking C executable cmTryCompileExec3184109505

  /usr/bin/cmake -E cmake_link_script
  CMakeFiles/cmTryCompileExec3184109505.dir/link.txt --verbose=1

  /usr/bin/x86_64-w64-mingw32-gcc
  CMakeFiles/cmTryCompileExec3184109505.dir/testCCompiler.c.o -o
  cmTryCompileExec3184109505 -rdynamic

  x86_64-w64-mingw32-gcc: erreur: unrecognized command line option
  ‘-rdynamic’

  CMakeFiles/cmTryCompileExec3184109505.dir/build.make:88: recipe for target
  'cmTryCompileExec3184109505' failed

  make[1]: Leaving directory
  '/data/These/1_A/programmes/remanence/online_version_win32/CMakeFiles/CMakeTmp'


  make[1]: *** [cmTryCompileExec3184109505] Error 1

  Makefile:118: recipe for target 'cmTryCompileExec3184109505/fast' failed

  make: *** [cmTryCompileExec3184109505/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:3 (project)


-- Configuring incomplete, errors occurred!

但是我不明白为什么...好像C编译器有问题但是我真的不明白如何解决它...

如果您有任何想法，请提前非常感谢您！

汤姆

*********编辑******* 亲爱的弗洛里安，

感谢您的帮助！

我尝试使用您链接的工具链，但出现以下错误：

CUDA_TOOLKIT_ROOT_DIR not found or specified
CMake Error at /usr/share/cmake-3.0/Modules/FindCUDA.cmake:605 (if):
  if given arguments:

    "CUDA_VERSION" "VERSION_GREATER" "5.0" "AND" "CMAKE_CROSSCOMPILING" "AND" "MATCHES" "arm" "AND" "EXISTS" "CUDA_TOOLKIT_ROOT_DIR-NOTFOUND/targets/armv7-linux-gnueabihf"

  Unknown arguments specified
Call Stack (most recent call first):
  CMakeLists.txt:4 (find_package)


-- Configuring incomplete, errors occurred!

还有here CMakeOutput.log

CMake 似乎找不到正确的 CUDA，但我不明白为什么，因为当我为 GNU/Linux 编译时它运行良好...

Answer 1

正如@datenwolf 所说，CUDA 不适用于 MinGW。为了让 OpenCV 项目编译为 Windows，不幸的是，必须在普通 Windows 或虚拟机上使用 VS 编译它。