[libcxx] [llvm] Add libc++ github actions workflow to replace buildkite (PR #71836)

[Louis Dionne via llvm-commits]

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+# This file defines pre-commit CI for libc++ [bla bla bla].
+#
+# We split the configurations in multiple stages with the intent of saving compute time
+# when a job fails early in the pipeline. This is why the jobs are marked as `continue-on-error: false`.
+# We try to run the CI configurations with the most signal in the first stage.
+#
+# Stages 1 & 2 are meant to be "smoke tests", and are meant to catch most build/test failures quickly and without using
+# too many resources.
+# Stage 3 is "everything else", and is meant to catch breakages on more niche or unique configurations.
+#
+# Therefore, we "fail-fast" for any failures during stages 1 & 2, meaning any job failing cancels all other running jobs,
+# under the assumption that if the "smoke tests" fail, then the other configurations will likely fail in the same way.
+# However, stage 3 does not fail fast, as it's more likely that any one job failing is a flake or a configuration-specific
+#
+name: Build and Test libc++
+on:
+  pull_request:
+    paths:
+      - 'libcxx/**'
+      - 'libcxxabi/**'
+      - 'libunwind/**'
+      - 'runtimes/**'
+      - 'cmake/**'
+      - '.github/workflows/libcxx-build-and-test.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+
+env:
+  CMAKE: "/opt/bin/cmake"
+  # LLVM POST-BRANCH bump version
+  # LLVM POST-BRANCH add compiler test for ToT - 1, e.g. "Clang 17"
+  # LLVM RELEASE bump remove compiler ToT - 3, e.g. "Clang 15"
+  LLVM_HEAD_VERSION: "18"   # Used compiler, update POST-BRANCH.
+  LLVM_PREVIOUS_VERSION: "17"
+  LLVM_OLDEST_VERSION: "16"
+  GCC_STABLE_VERSION: "13"
+  LLVM_SYMBOLIZER_PATH: "/usr/bin/llvm-symbolizer-18"
+  CLANG_CRASH_DIAGNOSTICS_DIR: "crash_diagnostics"
+
+
+# Job breakdown:
+#   The jobs run in three stages to save resources while providing actionalable feedback as soon as possible.
+#   The stages are broken down as follows:
+#   - stage1:
+#     Stage1 contains the bots that most often fail.
+jobs:
+  stage1:
+    runs-on: libcxx-runners-16
+    continue-on-error: false
+    strategy:
+      fail-fast: true
+      matrix:
+        config: [ 'generic-cxx26', 'generic-cxx03', 'generic-modules' ]
+        cc: [  clang-18 ]
+        cxx: [ clang++-18 ]
+        clang_tidy: [ 'ON' ]
+        include:
+          - config: 'generic-gcc'
+            cc: 'gcc-13'
+            cxx: 'g++-13'
+            clang_tidy: 'OFF'
+    steps:
+      - uses: actions/checkout at v4
+      - name: ${{ matrix.config }}.${{ matrix.cxx }}
+        run: libcxx/utils/ci/run-buildbot ${{ matrix.config }}
+        env:
+          CC: ${{ matrix.cc }}
+          CXX: ${{ matrix.cxx }}
+          ENABLE_CLANG_TIDY: ${{ matrix.clang_tidy }}
+      - uses: actions/upload-artifact at v3
+        if: always()
+        with:
+          name: ${{ matrix.config }}-${{ matrix.cxx }}-results
+          path: |
+            **/test-results.xml
+            **/*.abilist
+            **/CMakeError.log
+            **/CMakeOutput.log
+            **/crash_diagnostics/*
+  stage2:
+    runs-on: libcxx-runners-8
+    needs: [ stage1 ]
+    continue-on-error: false
+    strategy:
+      fail-fast: true
+      matrix:
+        config: [ 'generic-cxx11', 'generic-cxx14', 'generic-cxx17',
+                  'generic-cxx20', 'generic-cxx23' ]
+        cc: [ 'clang-18' ]
+        cxx: [ 'clang++-18' ]
+        clang_tidy: [ 'ON' ]
+        include:
+          - config: 'generic-gcc-cxx11'
+            cc: 'gcc-13'
+            cxx: 'g++-13'
+            clang_tidy: 'OFF'
+          - config: 'generic-cxx23'
+            cc: 'clang-16'
+            cxx: 'clang++-16'
+            clang_tidy: 'OFF'
+          - config: 'generic-cxx23'
+            cc: 'clang-17'
+            cxx: 'clang++-17'
+            clang_tidy: 'OFF'
+    steps:
+      - uses: actions/checkout at v4
+      - name: ${{ matrix.config }}
+        run: libcxx/utils/ci/run-buildbot ${{ matrix.config }}
+        env:
+          CC: ${{ matrix.cc }}
+          CXX: ${{ matrix.cxx }}
+          ENABLE_CLANG_TIDY: ${{ matrix.clang_tidy }}
+      - uses: actions/upload-artifact at v3
+        if: always()  # Upload artifacts even if the build or test suite fails
+        with:
+          name: ${{ matrix.config }}-results
+          path: |
+            **/test-results.xml
+            **/*.abilist
+            **/CMakeError.log
+            **/CMakeOutput.log
+            **/crash_diagnostics/*
+  stage3:
+    needs: [ stage1, stage2 ]
+    continue-on-error: false
+    strategy:
+      fail-fast: false
+      max-parallel: 8
+      matrix:
+        config: [ 'generic-no-threads', 'generic-no-filesystem', 'generic-no-random_device',
+          'generic-no-localization', 'generic-no-unicode', 'generic-no-wide-characters',
+          'generic-no-experimental', 'generic-no-exceptions', 'generic-abi-unstable',
+          'generic-hardening-mode-fast',
+          'generic-hardening-mode-fast-with-abi-breaks',
+          'generic-hardening-mode-extensive',
+          'generic-hardening-mode-debug', 'generic-with_llvm_unwinder', 'generic-static', 'generic-merged',
+          'generic-modules-lsv', 'generic-no-tzdb' ]
----------------
ldionne wrote:

Can we make this an expanded yaml list:

```
config:
  - generic-no-localization
  - generic-no-unicode
  - etc...
```

I expect people will be adding stuff to it so making it a fully expanded list will make it easier and cleaner. And we should sort those entries while we're at it.

https://github.com/llvm/llvm-project/pull/71836