[libcxx] [ci] Update Clang for Windows jobs to 18.1.x

[mstorsjo]

Pick the latest version available in Chocolatey (18.1.6) and llvm-mingw (20240606, which includes LLVM 18.1.7).

Also add the flag "--allow-downgrade" when installing a specific version of LLVM. If the preinstalled version is higher than the requested one, Chocolatey would otherwise error out when requesting installing a lower version. This will avoid errors in the future, if the runner image comes preinstalled with a newer version of LLVM.

(This currently seems to happen with a recent version of the GitHub Actions runner image, version 20240610.1.0 has LLVM 18.1.6 already preinstalled, and will error out when trying to install the 17.0.6 version that we previously requested.)

[llvmbot]

@llvm/pr-subscribers-github-workflow

@llvm/pr-subscribers-libcxx

Author: Martin Storsjö (mstorsjo)

Changes

Pick the latest version available in Chocolatey (18.1.6) and llvm-mingw (20240606, which includes LLVM 18.1.7).

Also add the flag "--allow-downgrade" when installing a specific version of LLVM. If the preinstalled version is higher than the requested one, Chocolatey would otherwise error out when requesting installing a lower version. This will avoid errors in the future, if the runner image comes preinstalled with a newer version of LLVM.

(This currently seems to happen with a recent version of the GitHub Actions runner image, version 20240610.1.0 has LLVM 18.1.6 already preinstalled, and will error out when trying to install the 17.0.6 version that we previously requested.)

---

Full diff: https://github.com/llvm/llvm-project/pull/95228.diff

1 Files Affected:

• (modified) .github/workflows/libcxx-build-and-test.yaml (+2-2)

diff --git a/.github/workflows/libcxx-build-and-test.yaml b/.github/workflows/libcxx-build-and-test.yaml index 44a3d79c72c0a..f56ce7f0ec702 100644 --- a/.github/workflows/libcxx-build-and-test.yaml +++ b/.github/workflows/libcxx-build-and-test.yaml @@ -214,11 +214,11 @@ jobs: - name: Install a current LLVM if: ${{ matrix.mingw != true }} run: | - choco install -y llvm --version=17.0.6 + choco install -y llvm --version=18.1.6 --allow-downgrade - name: Install llvm-mingw if: ${{ matrix.mingw == true }} run: | - curl -LO https://github.com/mstorsjo/llvm-mingw/releases/download/20231128/llvm-mingw-20231128-ucrt-x86_64.zip + curl -LO https://github.com/mstorsjo/llvm-mingw/releases/download/20240606/llvm-mingw-20240606-ucrt-x86_64.zip powershell Expand-Archive llvm-mingw*.zip -DestinationPath . del llvm-mingw*.zip mv llvm-mingw* c:\llvm-mingw