| commit | f1531dc2ebfb2db721a94f6f19081fa89af536da | [log] [tgz] |
|---|---|---|
| author | Fabian Meumertzheim <meumertzheim@code-intelligence.com> | Tue Aug 10 07:21:08 2021 -0700 |
| committer | Copybara-Service <copybara-worker@google.com> | Tue Aug 10 07:22:31 2021 -0700 |
| tree | c424cadf8d349ebf3e2d250720041b1d2b5ad1a7 | |
| parent | e0d6e6fc530a26b28e1192af505985c71736bb1b [diff] |
Add support for clang's libc++ to Unix toolchain Due to two separate issues, it is currently not possible to compile and link against clang's libc++ with Bazel's auto-configured Unix toolchain, e.g. via adding `-stdlib=libc++` as a `cxxopt` and `linkopt` on a `cc_binary`: 1. Since Bazel uses `-no-canonical-prefixes`, clang is not able to find the libc++ headers if it is invoked through a symlink in a different directory. This is fixed by fully resolving the path to the clang binary in the toolchain. 2. The list of built-in include paths does not contain the base directory of the libc++ headers, which makes Bazel's implicit dependency checker fail on targets with the `cxxopt` `-stdlib=lib++`. This is fixed by adding the search paths obtained from `clang -v` with that option to the list of built-in include paths in the toolchain. Both 1. and 2. can be partially worked around by passing in `-stdlib=libc++` and a fully resolved `CC` via `--repo_env`. However, the former means that the choice of standard library has to be fixed for the entire workspace and the latter cannot be accomplished with a system-independent entry in `.bazelrc`. Proper fixes in Bazel thus seem vastly superior. Fixes #13071 Closes #13666. PiperOrigin-RevId: 389877696
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