Partially fix C++ coverage on Linux

gcov 8.3.0 no longer prints "Creating <output>" messages, so we have to
fall back to collecting all .gcov files in the current directory. Also,
provide a mechanism to pass additional options to gcov, e.g.:

--test_env=COVERAGE_GCOV_OPTIONS="-p -x"

We cannot always pass these flags, as not all versions of gcov support
them.

This also solves one issue on MacOS, where gcov output emits lower-case
"creating <output>" messages.

Progress on #9406.

PiperOrigin-RevId: 291172263
1 file changed
tree: 34d32c6e9d81adb1b7be2775694ea1c2ac7eaf4f
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

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