不确定如何为 MinGW 构建 OpenCV

Question

TL; 博士;

我正在尝试为 MinGW 构建 OpenCV。 cmake一直抱怨没有健全的 CXX 编译器，尽管我可以用 g++.exe 编译示例代码。

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长版

我尝试为 MinGW 找到一个二进制文件， 但这没有用。

我尝试为 MinGW 进行编译，但由于 sh.exe 不在 $PATH 中出现一些错误而失败。 我很困惑，因为在文件系统上重命名目标文件并没有解决问题。

E:\work\opencv\mybuild> cmake -G "MinGW Makefiles" ../sources
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeMin
GWFindMake.cmake:22 (message):
  sh.exe was found in your PATH, here:


  C:/Users/desuna/AppData/Local/GitHub/PortableGit_054f2e797ebafd44a30203088cd3d
58663c627ef/bin/sh.exe


  For MinGW make to work correctly sh.exe must NOT be in your path.

  Run cmake from a shell that does not have sh.exe in your PATH.

  If you want to use a UNIX shell, then use MSYS Makefiles.

Call Stack (most recent call first):
  CMakeLists.txt:56 (project)


CMake Error: CMake was unable to find a build program corresponding to "MinGW Ma
kefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a differe
nt build tool.
CMake Error: CMake was unable to find a build program corresponding to "MinGW Ma
kefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a differe
nt build tool.
CMake Error: Error required internal CMake variable not set, cmake may be not be
 built correctly.
Missing variable is:
CMAKE_CXX_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be not be
 built correctly.
Missing variable is:
CMAKE_CXX_COMPILER
CMake Error: Could not find cmake module file: E:/work/opencv/mybuild/CMakeFiles
/2.8.12.2/CMakeCXXCompiler.cmake
CMake Error: Error required internal CMake variable not set, cmake may be not be
 built correctly.
Missing variable is:
CMAKE_C_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be not be
 built correctly.
Missing variable is:
CMAKE_C_COMPILER
CMake Error: Could not find cmake module file: E:/work/opencv/mybuild/CMakeFiles
/2.8.12.2/CMakeCCompiler.cmake
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!

后来有人告诉我，MSYS 生成文件没有这个要求。 现在有一个关于 C++ 编译器的错误。 但是，C++ 编译器被正确识别。 另外，我尝试编译一个虚拟的 test.cxx 程序并且它起作用了。

E:\work\opencv\mybuild> cmake -G "MSYS Makefiles" ../sources
-- The CXX compiler identification is GNU 4.8.1
-- The C compiler identification is GNU 4.8.1
-- Check for working CXX compiler: C:/MinGW/bin/g++.exe
-- Check for working CXX compiler: C:/MinGW/bin/g++.exe -- broken
CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeTes
tCXXCompiler.cmake:54 (message):
  The C++ compiler "C:/MinGW/bin/g++.exe" is not able to compile a simple
  test program.

  It fails with the following output:

   Change Dir: E:/work/opencv/mybuild/CMakeFiles/CMakeTmp

错误日志是：

Determining if the CXX compiler works failed with the following output:
Change Dir: E:/work/opencv/mybuild/CMakeFiles/CMakeTmp

Run Build Command:C:/PROGRA~2/GnuWin32/bin/make.exe "cmTryCompileExec1507552824/fast"
C:/PROGRA~2/GnuWin32/bin/make.exe -f CMakeFiles/cmTryCompileExec1507552824.dir/build.make CMakeFiles/cmTryCompileExec1507552824.dir/build

make.exe[1]: Entering directory `E:/work/opencv/mybuild/CMakeFiles/CMakeTmp'

"/C/Program Files (x86)/CMake 2.8/bin/cmake.exe" -E cmake_progress_report /E/work/opencv/mybuild/CMakeFiles/CMakeTmp/CMakeFiles 1

Building CXX object CMakeFiles/cmTryCompileExec1507552824.dir/testCXXCompiler.cxx.obj
/C/MinGW/bin/g++.exe     -o CMakeFiles/cmTryCompileExec1507552824.dir/testCXXCompiler.cxx.obj -c /E/work/opencv/mybuild/CMakeFiles/CMakeTmp/testCXXCompiler.cxx

process_begin: CreateProcess(NULL, /C/MinGW/bin/g++.exe -o CMakeFiles/cmTryCompileExec1507552824.dir/testCXXCompiler.cxx.obj -c /E/work/opencv/mybuild/CMakeFiles/CMakeTmp/testCXXCompiler.cxx, ...) failed.

make (e=2): The system cannot find the file specified.


make.exe[1]: *** [CMakeFiles/cmTryCompileExec1507552824.dir/testCXXCompiler.cxx.obj] Error 2

make.exe[1]: Leaving directory `E:/work/opencv/mybuild/CMakeFiles/CMakeTmp'

make.exe: *** [cmTryCompileExec1507552824/fast] Error 2

我的目标是在 Windows 7 下为 C++ 中的小型应用程序进行一步构建，该应用程序链接到 onecv_core、opencv_highgui 等。 为此，我似乎需要在 mingw 下使用 gcc 从源代码构建 OpenCV。 请告知正确的方法是什么。

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编辑：

我尝试了barek的答案，错误与 MSYS 目标相同 - 没有健全的 C++ 编译器。 我接下来尝试了cmake-gui ，指定了编译器。 另外，我确保 MinGW/bin 在我的路径中。 遵循错误消息：

CMake Error: CMake was unable to find a build program corresponding to "MinGW Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
CMake Error: CMake was unable to find a build program corresponding to "MinGW Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER_ENV_VAR
CMake Error: Could not find cmake module file: E:/work/opencv/mybuild/CMakeFiles/2.8.12.2/CMakeCXXCompiler.cmake
CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_C_COMPILER_ENV_VAR
CMake Error: Could not find cmake module file: E:/work/opencv/mybuild/CMakeFiles/2.8.12.2/CMakeCCompiler.cmake
Configuring incomplete, errors occurred!

我怀疑问题出在某些非常愚蠢的地方，例如由于 MinGW 安装不当，CMAKE 无法更改目录。

这里可以找到讨论，但我：

• 检查 MinGW/bin 是否在我的路径中
• 还在cmake-gui手动指定了 C 和 C++ 编译器路径
• 使用 SourceForge 的安装程序安装 MinGW 并选择复选框“Alter PATH”。

Answer 1

1. 清理！ 删除所有以前的构建尝试、 CmakeFile.cache等。

2. 在路径上有 MingW/bin

3. 在 opencv 目录中创建一个名为 build_mingw 的文件夹， cd在那里

4. cmake -G "MinGW Makefiles" -D CMAKE_CXX_COMPILER=mingw32-g++.exe -D CMAKE_MAKE_PROGRAM=mingw32-make.exe .. # <-- 注意末尾的点

5. mingw32-make

6. mingw32-make install

Answer 2

我尝试了这里提到的所有内容， 但未找到 CMAKE_MAKE_PROGRAM，但没有任何帮助。 然后重新启动计算机，它就可以工作了。