不确定如何为 MinGW 构建 OpenCV

2021-12-26 00:00:00 opencv cmake c++

TL;DR;

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.

I am trying to build OpenCV for MinGW. cmake keeps complaining about no sane CXX compiler, although I can compile sample code with g++.exe.

长版

我尝试为 MinGW 找到一个二进制文件，但这没有用.

I tried finding a binary for MinGW, but this didn't work.

我尝试为 MinGW 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.

I tried compiling for MinGW but that fails with some error about sh.exe not being in $PATH. I am puzzled, as renaming the target file on the filesystem did not resolve the issue.

E:workopencvmybuild> 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，我尝试编译了一个虚拟的 test.cxx 程序，并且成功了.

I was advised later, that MSYS makefiles do not have this requirement. Now there was an error about the C++ compiler. However, the C++ compiler is correctly identified. Also, I tried compiling a dummy test.cxx program and it worked.

E:workopencvmybuild> 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.

My aim is to have one-step build under Windows 7 for a small application in C++, that links against onecv_core, opencv_highgui and several more. For this, it appears that I need to build OpenCV from source with gcc under mingw. Please advise what is the correct approach to that.

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，指定编译器.另外，我确保 MinGW/bin 在我的路径中.遵循错误消息:

I tried barek's answer, and the error is the same as with MSYS target - no sane c++ compiler. I next tried cmake-gui, specifying compilers. Also, I made sure that MinGW/bin is in my path. Follows the error message:

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.

I suspect the problem lies in somethign really stupid, like CMAKE not being able to change directories, due to impropper MinGW isntallation.

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
    • 中手动指定了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".

推荐答案

  1. 清理！删除所有以前的构建尝试，CmakeFile.cache 等

在路径上有 MingW/bin

have MingW/bin on the path

在 opencv 目录中创建一个文件夹，名为 build_mingw，cd 在那里

make a folder within the opencv dir, called build_mingw, cd there

cmake -G "MinGW Makefiles" -D CMAKE_CXX_COMPILER=mingw32-g++.exe -D CMAKE_MAKE_PROGRAM=mingw32-make.exe .. # <-- 注意点结束

cmake -G "MinGW Makefiles" -D CMAKE_CXX_COMPILER=mingw32-g++.exe -D CMAKE_MAKE_PROGRAM=mingw32-make.exe .. # <-- note the dots at the end

mingw32-make

mingw32-make install

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