CI: try to fix the issue with LLVM trunk after Claude analysis

.github/workflows/llvm-trunk-failure-analyzer.yml

@@ -31,6 +31,9 @@ jobs:
       actions: read
       issues: write
 
+    outputs:
+      issue_number: ${{ steps.create-issue.outputs.issue_number }}
+
     steps:
     - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
 
@@ -168,6 +171,7 @@ jobs:
         cat analysis_output.txt
 
     - name: Create GitHub issue with analysis
+      id: create-issue
       env:
         GH_TOKEN: ${{ github.token }}
       run: |
@@ -212,8 +216,86 @@ jobs:
             echo "---"
             echo "Generated with [Claude Code](https://claude.com/claude-code)"
           } > issue_body.md
-          gh issue create \
+          ISSUE_NUMBER=$(gh issue create \
             --title "LLVM trunk nightly build failure" \
             --label "llvm-trunk" \
-            --body-file issue_body.md
+            --body-file issue_body.md | grep -oE '[0-9]+$')
+          echo "Created issue #$ISSUE_NUMBER"
+          echo "issue_number=$ISSUE_NUMBER" >> "$GITHUB_OUTPUT"
+        else
+          echo "issue_number=$EXISTING_ISSUE" >> "$GITHUB_OUTPUT"
+        fi
+
+  attempt-fix:
+    # Attempt to automatically fix LLVM trunk failures that are fixable on ISPC side
+    needs: analyze-failure
+    if: success()
+    runs-on: ubuntu-22.04
+    timeout-minutes: 60
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+
+    env:
+      LLVM_VERSION: "21.1"
+      LLVM_TAR: llvm-21.1.8-ubuntu22.04-Release+Asserts-x86.arm.wasm.tar.xz
+      LLVM_REPO: https://github.com/ispc/ispc.dependencies
+
+    steps:
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
+      with:
+        fetch-depth: 0
+
+    - name: Setup Node.js
+      uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
+      with:
+        node-version: '20'
+
+    - name: Install build dependencies
+      run: |
+        echo "APT::Acquire::Retries \"3\";" | sudo tee -a /etc/apt/apt.conf.d/80-retries
+        sudo apt-get update
+        sudo apt-get install -y --no-install-recommends \
+          cmake ninja-build bison flex m4 \
+          libc6-dev libc6-dev-i386 g++-multilib \
+          libtbb-dev libstdc++6
+
+    - name: Download LLVM
+      run: |
+        wget -q --retry-connrefused --waitretry=5 --read-timeout=20 --timeout=15 -t 5 \
+          "$LLVM_REPO/releases/download/llvm-$LLVM_VERSION-ispc-dev/$LLVM_TAR"
+        tar xf "$LLVM_TAR"
+        rm -f "$LLVM_TAR"
+        echo "$GITHUB_WORKSPACE/bin-$LLVM_VERSION/bin" >> "$GITHUB_PATH"
+
+    - name: Configure Git
+      run: |
+        git config user.name "github-actions[bot]"
+        git config user.email "github-actions[bot]@users.noreply.github.com"
+
+    - name: Attempt to fix issue
+      id: fix-attempt
+      env:
+        ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+        GH_TOKEN: ${{ github.token }}
+        ISSUE_NUMBER: ${{ needs.analyze-failure.outputs.issue_number }}
+      run: |
+        if [ -z "$ISSUE_NUMBER" ]; then
+          echo "No issue number available, skipping fix attempt"
+          exit 0
+        fi
+
+        echo "=== Attempting to fix issue #$ISSUE_NUMBER ==="
+
+        # Run Claude Code with the fix-gh-issue command
+        if npx @anthropic-ai/claude-code --print \
+          "/fix-gh-issue $ISSUE_NUMBER" \
+          > fix_output.txt 2>&1; then
+          echo "Fix attempt completed"
+          cat fix_output.txt
+        else
+          echo "Fix attempt failed or issue is not fixable on ISPC side"
+          cat fix_output.txt
+          exit 0
         fi