[all-commits] [llvm/llvm-project] 5024df: [libc++][ci] Add a test configuration with an inco...

[Martin Storsjö via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5024dff6eee5a95a741b063c953422c5b6d02fdc
      https://github.com/llvm/llvm-project/commit/5024dff6eee5a95a741b063c953422c5b6d02fdc
  Author: Martin Storsjö <martin at martin.st>
  Date:   2024-09-05 (Thu, 05 Sep 2024)

  Changed paths:
    M .github/workflows/libcxx-build-and-test.yaml
    M libcxx/utils/ci/run-buildbot

  Log Message:
  -----------
  [libc++][ci] Add a test configuration with an incomplete sysroot (#107089)

When bringing up a new cross compiler from scratch, we build
libunwind/libcxx in a setup where the toolchain is incomplete and unable
to perform the normal linker checks; this requires a few special cases
in the CMake files.

We simulate that scenario by removing the libc++ headers, libunwind and
libc++ libraries from the installed toolchain.

We need to set CMAKE_CXX_COMPILER_WORKS since CMake fails to probe the
compiler. We need to set CMAKE_CXX_COMPILER_TARGET, since LLVM's
heuristics fail when CMake hasn't been able to probe the environment
properly. (This is normal; one has to set those options when setting up
such a toolchain from scratch.)

This adds CI coverage for these build scenarios, which otherwise seldom
are tested by some build flow (but are essential when setting up a cross
compiler from scratch).



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