Cannot link with default settings in win32/x86

[biojppm]

With this configuration in Github, cibuildwheel fails to build the wheel for the windows 32 bit builds (commented below). The failure only happens with the win32 builds; all other windows and linux builds succeed.

  python_wheels:
    name: python/${{matrix.config.pythonv}}/${{matrix.config.osname}}/${{matrix.config.cibw_arch}}
    runs-on: ${{matrix.config.os}}
    env: {DEV: OFF,
          BT: Release,
          OS: "${{matrix.config.os}}",
          PYTHONV: "${{matrix.config.pythonv}}",
          API: ON,
          CMAKE_FLAGS: "-DRYML_DEV=OFF -DRYML_BUILD_API=ON -DRYML_API_TESTS=OFF -DRYML_API_BENCHMARKS=OFF",
          CIBW_BUILD: "cp${{matrix.config.cibw_pyv}}*-${{matrix.config.cibw_platform}}",
          CIBW_ARCHS: "${{matrix.config.cibw_arch}}"}
    strategy:
      fail-fast: false
      matrix:
        config:
          - {pythonv: 3.9 , cibw_pyv: 39 , cibw_arch: x86_64, osname: linux, cibw_platform: manylinux_x86_64, os: ubuntu-20.04}
          - {pythonv: 3.9 , cibw_pyv: 39 , cibw_arch: i686  , osname: linux, cibw_platform: manylinux_i686  , os: ubuntu-20.04}
          - {pythonv: 3.9 , cibw_pyv: 39 , cibw_arch: AMD64 , osname: win  , cibw_platform: win_amd64       , os: windows-2019, cxx: vs2019}
          # error:
          - {pythonv: 3.9 , cibw_pyv: 39 , cibw_arch: x86   , osname: win  , cibw_platform: win32           , os: windows-2019, cxx: vs2019}
          - {pythonv: 3.8 , cibw_pyv: 38 , cibw_arch: x86_64, osname: linux, cibw_platform: manylinux_x86_64, os: ubuntu-20.04}
          - {pythonv: 3.8 , cibw_pyv: 38 , cibw_arch: i686  , osname: linux, cibw_platform: manylinux_i686  , os: ubuntu-20.04}
          - {pythonv: 3.8 , cibw_pyv: 38 , cibw_arch: AMD64 , osname: win  , cibw_platform: win_amd64       , os: windows-2019, cxx: vs2019}
          # error:
          - {pythonv: 3.8 , cibw_pyv: 38 , cibw_arch: x86   , osname: win  , cibw_platform: win32           , os: windows-2019, cxx: vs2019}
          - {pythonv: 3.7 , cibw_pyv: 37 , cibw_arch: x86_64, osname: linux, cibw_platform: manylinux_x86_64, os: ubuntu-20.04}
          - {pythonv: 3.7 , cibw_pyv: 37 , cibw_arch: i686  , osname: linux, cibw_platform: manylinux_i686  , os: ubuntu-20.04}
          - {pythonv: 3.7 , cibw_pyv: 37 , cibw_arch: AMD64 , osname: win  , cibw_platform: win_amd64       , os: windows-2019, cxx: vs2019}
          # error:
          - {pythonv: 3.7 , cibw_pyv: 37 , cibw_arch: x86   , osname: win  , cibw_platform: win32           , os: windows-2019, cxx: vs2019}
    steps:
      # use fetch-depth to ensure all tags are fetched
      - {name: checkout, uses: actions/checkout@v2, with: {submodules: recursive, fetch-depth: 0}}
      - name: install python ${{matrix.config.pythonv}}
        uses: actions/setup-python@v2
        with:
          python-version: ${{matrix.config.pythonv}}
      - name: install requirements
        run: |
          echo "expecting python ${{matrix.config.pythonv}}..."
          python --version
          pip install -v -r requirements.txt
      - name: create wheel
        uses: joerick/cibuildwheel@v2.1.1
      - name: rename wheelhouse -> dist
        run: |
          mv -fv wheelhouse dist
          ls -lFhp dist/
      - name: Save artifacts for publishing to PyPI
        uses: actions/upload-artifact@v1
        with: {name: dist, path: dist}

Here's an example of the error:

  api/CMakeFiles/ryml-api-python3.dir/src/python3/rymlPYTHON_wrap.cxx.obj:rymlPYTHON_wrap.cxx:(.text+0x23): undefined reference to `__imp_PyExc_RuntimeError'
  api/CMakeFiles/ryml-api-python3.dir/src/python3/rymlPYTHON_wrap.cxx.obj:rymlPYTHON_wrap.cxx:(.text+0x33): undefined reference to `__imp_PyExc_IOError'
  api/CMakeFiles/ryml-api-python3.dir/src/python3/rymlPYTHON_wrap.cxx.obj:rymlPYTHON_wrap.cxx:(.text+0x43): undefined reference to `__imp_PyExc_MemoryError'
  api/CMakeFiles/ryml-api-python3.dir/src/python3/rymlPYTHON_wrap.cxx.obj:rymlPYTHON_wrap.cxx:(.text+0x53): undefined reference to `__imp_PyExc_AttributeError'
// ... etc

I suspect the compiler for CMake (C:\ProgramData\chocolatey\bin\c++.exe) is not producing a binary with the same bitness as the python distribution (C:/cibw/python/pythonx86.3.9.6/tools/python.exe). Am I missing a specific setting for this situation? Do I need to pass 32bit flags for the compiler?

[Czaki]

Yes, you need to add specific flags, For inspiration look here: https://github.com/andrix/python-snappy/blob/master/build_snappy.sh

[biojppm]

Thanks, that was it.

[henryiii]

Also, you should remove these lines:

      - name: install python ${{matrix.config.pythonv}}
        uses: actions/setup-python@v2
        with:
          python-version: ${{matrix.config.pythonv}}
      - name: install requirements
        run: |
          echo "expecting python ${{matrix.config.pythonv}}..."
          python --version
          pip install -v -r requirements.txt

They do not affect cibuildwheel, the built wheel, or anything else, and confuse the reader. You can also make "dist" the output directory if you want, that's settable. Also cibuildwheel already lists the output at the end, specifically so you don't have to do an "ls" on the output.

[biojppm]

Thanks for the notes, which helped clean up my workflow.