Add auto-configured Unix toolchain support for `BAZEL_CONLYOPTS`

Since `BAZEL_CXXOPTS` is only used for C++ compilation, there was no way to pass in options for C compilation that would also be used when discovering built-in include directories with `-xc`.

When using the non-Xcode auto-configured toolchain on macOS, it can be necessary to specify the macOS SDK sysroot via a compiler flag. While this can usually be achieved by combining `--conlyopt` with `BAZEL_CXXOPTS`, this assumes that the built-in include directories returned with `-xc` are always a subset of those returned with `-xc++`. Having `BAZEL_CONLYOPTS` allows this situation to be navigated in a way that is clearly correct.

Also adds test coverage for `BAZEL_CXXOPTS`.

Closes #16839.

PiperOrigin-RevId: 492452434
Change-Id: I72fbe25da22f3c3ca3be9e52bbf0c5fe1d0828ac
5 files changed
tree: fa9e0be0e637771ba9d9e330542d3a9096a2bae0
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .gitattributes
  11. .gitignore
  12. AUTHORS
  13. BUILD
  14. CHANGELOG.md
  15. CODE_OF_CONDUCT.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. LICENSE
  25. MODULE.bazel
  26. README.md
  27. SECURITY.md
  28. WORKSPACE
  29. WORKSPACE.bzlmod
README.md

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