[all-commits] [llvm/llvm-project] cd5ed7: [libc++] Make CC and CXX environment variables man...

[Louis Dionne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cd5ed7ca87fbf287c4453c728cb92f77a4ecf78c
      https://github.com/llvm/llvm-project/commit/cd5ed7ca87fbf287c4453c728cb92f77a4ecf78c
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2025-12-02 (Tue, 02 Dec 2025)

  Changed paths:
    M .github/workflows/libcxx-build-and-test.yaml
    M .github/workflows/libcxx-check-generated-files.yml
    M libcxx/docs/AddingNewCIJobs.rst
    M libcxx/utils/ci/buildkite-pipeline.yml
    M libcxx/utils/ci/run-buildbot

  Log Message:
  -----------
  [libc++] Make CC and CXX environment variables mandatory in run-buildbot (#166875)

Previously, the bootstrapping-build job defined in run-buildbot required
the CC and CXX environment variables to be defined even though
run-buildbot documents these environment variables as being optional. It
also relied on ccache being available.

Refactor run-buildbot to make CC and CXX mandatory, and refactor various
places in the CI where we called run-buildbot without setting CC and
CXX. After this patch, all places that use run-buildbot are setting CC
and CXX before calling the script, which makes it easier to track what
compiler is used where. This also allows simplifying run-buildbot
itself.

Finally, this patch makes ccache optional for running the bootstrapping
build.



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