v2 shows only Python coverage and omits C coverage

[hugovk]

Testing switching use of v1 of the action and the bash uploader to v2 of the action means C code which was previously reported is now omitted.

For example, using the action like this (varying the flags/name per OS):

    - name: Upload coverage
      uses: codecov/codecov-action@v2
      with:
        file: ./coverage.xml
        flags: ${{ matrix.codecov-flag }}
        name: ${{ matrix.os }} Python ${{ matrix.python-version }}

Here's a branch using v1 and the bash uploader, report includes both Python and C code (C code in src and src/libImaging dirs):

• https://github.com/hugovk/Pillow/tree/main-mingw-coverage-flag
• https://codecov.io/gh/hugovk/Pillow/tree/b522fba4ed58a4449af1c6c788cec15bdb36231d
• https://codecov.io/gh/hugovk/Pillow/tree/b522fba4ed58a4449af1c6c788cec15bdb36231d/src

Here's a branch switching to v2 for both, but report includes only Python code:

• https://github.com/hugovk/Pillow/tree/codecov/codecov-action%40v2
• Diff: https://github.com/hugovk/Pillow/compare/main-mingw-coverage-flag...hugovk:codecov/codecov-action@v2
• https://codecov.io/gh/hugovk/Pillow/tree/ef5e9edfccf5699cbfd0731be52efd4da8f031d3
• https://codecov.io/gh/hugovk/Pillow/tree/ef5e9edfccf5699cbfd0731be52efd4da8f031d3/src

There's a bit of variation between OS, but we're generally building like this:

CFLAGS="-coverage -Werror=implicit-function-declaration" python3 setup.py build_ext install

And testing with pytest and pytest-cov and generating coverage.xml with either the --cov-report xml switch or coverage xml command.

Am I missing something?

[thomasrockhu-codecov]

@hugovk if this is still an issue, please open a topic on our community boards