osx_cc_wrapper: Only expand existing response files

Closes #13044
Applies the changes suggested in https://github.com/bazelbuild/bazel/pull/13044#issuecomment-783539568

Not all arguments starting with `@` represent response files, e.g. `-install_name @rpath/...` or `-Xlinker -rpath -Xlinker @loader_path/...` do not refer to response files and attempting to read them as such will fail the build.

Users don't always have control over these arguments, meaning transforming them to `-Wl,-install_name,@rpath/...` or `-Wl,-rpath,@loader_path/...` is not always an option. E.g. as described in https://github.com/bazelbuild/bazel/pull/13044#issuecomment-779380394 where these flags are emitted by the Haskell compiler GHC (see https://github.com/bazelbuild/bazel/pull/13044#issuecomment-782228172 for their reasoning).

With this change `osx_cc_wrapper` will only interpret arguments starting with `@` as response files if the corresponding file exists and is readable. This is analogous to the behavior defined in `wrapped_clang.cc`. See https://github.com/bazelbuild/bazel/pull/13044#issuecomment-783539568 for discussion.

Closes #13148.

PiperOrigin-RevId: 436207868
2 files changed
tree: 730154d6a3fae633089864ee0bb03992dd1f6650
  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. CODEBASE.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. ISSUE_TEMPLATE.md
  26. LICENSE
  27. MODULE.bazel
  28. README.md
  29. SECURITY.md
  30. WORKSPACE
  31. WORKSPACE.bzlmod
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