build mingw64 error

[missionsave]

error log | 日志或报错信息 | ログ

CMake Error: Could not create named generator MinGW Makefiles

how to reproduce | 复现步骤 | 再現方法

cmake -DNCNN_VULKAN=ON -G "MinGW Makefiles" ..

[nihui]

To resolve the CMake Error: Could not create named generator MinGW Makefiles, follow these steps:

1. Verify MinGW Installation

Ensure MinGW (preferably MinGW-w64) is installed correctly. Check if mingw32-make.exe, gcc.exe, and g++.exe exist in the MinGW\bin directory (e.g., C:\Qt\Qt5.12.11\Tools\mingw730_64\bin).

2. Set Environment Variables

Add the MinGW bin directory to your system PATH:

• Right-click This PC → Properties → Advanced system settings → Environment Variables → Edit PATH → Add the MinGW bin path (e.g., C:\MinGW\bin).

3. Explicitly Specify Generator and Compiler Paths

Run CMake with the MinGW Makefiles generator and define compiler paths explicitly:

cmake -G "MinGW Makefiles" \
      -DCMAKE_MAKE_PROGRAM="C:/MinGW/bin/mingw32-make.exe" \
      -DCMAKE_C_COMPILER="C:/MinGW/bin/gcc.exe" \
      -DCMAKE_CXX_COMPILER="C:/MinGW/bin/g++.exe" \
      <source_path>

4. Clean Build Cache

Delete CMakeCache.txt and the CMakeFiles directory if you previously used a different generator (e.g., Visual Studio).

5. Handle Large File Compilation (Optional)

If encountering too many sections errors, add -Wa,-mbig-obj to CMAKE_CXX_FLAGS in CMake:

cmake ... -DCMAKE_CXX_FLAGS="-Wa,-mbig-obj"

Verification

Check toolchain validity:

gcc --version      # Should show GCC version
mingw32-make --version  # Should show Make version

Then compile using mingw32-make.

Notes

• Avoid spaces or non-ASCII characters in paths.
• For Qt’s MinGW, ensure paths match (e.g., C:/Qt/Qt5.12.11/Tools/mingw730_64/bin).

If the issue persists, reinstall MinGW or use CMake GUI to configure paths interactively.