[libcxx] [llvm] [libc++] Move some macOS CI jobs to Github actions (PR #89083)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Louis Dionne (ldionne)

<details>
<summary>Changes</summary>

This is an attempt to decouple macOS CI testing from BuildKite, which would make the maintenance of macOS CI easier and more accessible to all contributors. Right now, the macOS CI is running entirely on machines owned by the LLVM Foundation with only a small set of contributors having direct access to them.

The story for performing back-deployment testing still needs to be figured out, so for now we are retaining some jobs under BuildKite.

---
Full diff: https://github.com/llvm/llvm-project/pull/89083.diff


2 Files Affected:

- (modified) .github/workflows/libcxx-build-and-test.yaml (+34) 
- (modified) libcxx/utils/ci/buildkite-pipeline.yml (+18-57) 


``````````diff
diff --git a/.github/workflows/libcxx-build-and-test.yaml b/.github/workflows/libcxx-build-and-test.yaml
index 1e9367732e5911..99011c9bd0cb84 100644
--- a/.github/workflows/libcxx-build-and-test.yaml
+++ b/.github/workflows/libcxx-build-and-test.yaml
@@ -85,6 +85,7 @@ jobs:
             **/CMakeError.log
             **/CMakeOutput.log
             **/crash_diagnostics/*
+
   stage2:
     if: github.repository_owner == 'llvm'
     runs-on: libcxx-runners-8-set
@@ -134,6 +135,7 @@ jobs:
             **/CMakeError.log
             **/CMakeOutput.log
             **/crash_diagnostics/*
+
   stage3:
     if: github.repository_owner == 'llvm'
     needs: [ stage1, stage2 ]
@@ -199,6 +201,38 @@ jobs:
             **/CMakeError.log
             **/CMakeOutput.log
             **/crash_diagnostics/*
+
+  macos:
+    runs-on: macos-latest
+    needs: [ stage1 ]
+    strategy:
+      fail-fast: false
+      matrix:
+        config: [
+          generic-cxx03,
+          generic-cxx23,
+          generic-modules,
+          apple-system
+        ]
+    steps:
+      - uses: actions/checkout at v4
+      - uses: maxim-lobanov/setup-xcode at v1
+        with:
+          xcode-version: 'latest-stable'
+      - name: Build and test
+        run: |
+          bash libcxx/utils/ci/run-buildbot ${{ matrix.config }}
+      - uses: actions/upload-artifact at 26f96dfa697d77e81fd5907df203aa23a56210a8 # v4.3.0
+        if: always()  # Upload artifacts even if the build or test suite fails
+        with:
+          name: macos-${{ matrix.config }}-results
+          path: |
+            **/test-results.xml
+            **/*.abilist
+            **/CMakeError.log
+            **/CMakeOutput.log
+            **/crash_diagnostics/*
+
   windows:
     runs-on: windows-2022
     needs: [ stage1 ]
diff --git a/libcxx/utils/ci/buildkite-pipeline.yml b/libcxx/utils/ci/buildkite-pipeline.yml
index 4bacdec8f8d6bc..0e9a02ad081b13 100644
--- a/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/libcxx/utils/ci/buildkite-pipeline.yml
@@ -56,47 +56,8 @@ environment_definitions:
 
 
 steps:
-- group: ':mac: Apple'
+- group: ':mac: Apple Backdeployment'
   steps:
-  - label: MacOS x86_64
-    command: libcxx/utils/ci/run-buildbot generic-cxx23
-    agents:
-      queue: libcxx-builders
-      os: macos
-      arch: x86_64
-    <<: *common
-
-  - label: MacOS arm64
-    command: libcxx/utils/ci/run-buildbot generic-cxx23
-    agents:
-      queue: libcxx-builders
-      os: macos
-      arch: arm64
-    <<: *common
-
-  - label: MacOS with Modules
-    command: libcxx/utils/ci/run-buildbot generic-modules
-    agents:
-      queue: libcxx-builders
-      os: macos
-    <<: *common
-
-  - label: MacOS with C++03
-    command: libcxx/utils/ci/run-buildbot generic-cxx03
-    agents:
-      queue: libcxx-builders
-      os: macos
-    <<: *common
-
-    # Build with the configuration we use to generate libc++.dylib on Apple platforms
-  - label: Apple system
-    command: libcxx/utils/ci/run-buildbot apple-system
-    agents:
-      queue: libcxx-builders
-      os: macos
-      arch: arm64 # This can technically run on any architecture, but we have more resources on arm64 so we pin this job to arm64
-    <<: *common
-
   - label: Apple back-deployment macosx10.13
     command: libcxx/utils/ci/run-buildbot apple-system-backdeployment-10.13
     agents:
@@ -121,6 +82,23 @@ steps:
       arch: x86_64 # TODO: Remove this once we are able to run back-deployment on arm64 again, since this isn't x86_64 specific
     <<: *common
 
+    # TODO: Re-enable this once we've figured out how to run back-deployment testing on arm64 on recent OSes
+    # - label: "Apple back-deployment macosx11.0 arm64"
+    #   command: "libcxx/utils/ci/run-buildbot apple-system-backdeployment-11.0"
+    #   artifact_paths:
+    #     - "**/test-results.xml"
+    #     - "**/*.abilist"
+    #   agents:
+    #     queue: "libcxx-builders"
+    #     os: "macos"
+    #     arch: "arm64"
+    #   retry:
+    #     automatic:
+    #       - exit_status: -1  # Agent was lost
+    #         limit: 2
+    #   timeout_in_minutes: 120
+
+
 - group: ARM
   steps:
   - label: AArch64
@@ -230,20 +208,3 @@ steps:
       queue: libcxx-builders
       os: android
     <<: *common
-
-
-    # TODO: Re-enable this once we've figured out how to run back-deployment testing on arm64 on recent OSes
-    # - label: "Apple back-deployment macosx11.0 arm64"
-    #   command: "libcxx/utils/ci/run-buildbot apple-system-backdeployment-11.0"
-    #   artifact_paths:
-    #     - "**/test-results.xml"
-    #     - "**/*.abilist"
-    #   agents:
-    #     queue: "libcxx-builders"
-    #     os: "macos"
-    #     arch: "arm64"
-    #   retry:
-    #     automatic:
-    #       - exit_status: -1  # Agent was lost
-    #         limit: 2
-    #   timeout_in_minutes: 120

``````````

</details>


https://github.com/llvm/llvm-project/pull/89083