Add PeleC clang-tidy test

Author: d-montgomery

.github/workflows/downstream.yml

@@ -124,3 +124,109 @@ jobs:
           export return=$(tail -n 1 clang-tidy-warnings.txt | awk '{print $2}')
           exit ${return}
 
+  PeleC-clang-tidy:
+    name: PeleC clang-tidy
+    runs-on: ubuntu-24.04
+
+    env:
+      BUILD_DIR: ${{ github.workspace }}/build-clang-tidy-c
+
+    steps:
+      - name: Checkout PelePhysics
+        uses: actions/checkout@v4
+        with:
+          path: pelephysics-pr
+          fetch-depth: 0
+
+      - name: Clone PeleC
+        run: |
+          git clone --recursive --shallow-submodules --single-branch \
+            https://github.com/AMReX-Combustion/PeleC
+
+      - name: Point PeleC/Submodules/PelePhysics to this PR
+        working-directory: PeleC
+        shell: bash
+        run: |
+          # Allow use of file:// remotes for submodules
+          git config --global protocol.file.allow always
+
+          # Point the submodule to the checked-out PR
+          git config -f .gitmodules submodule.Submodules/PelePhysics.url "file://$GITHUB_WORKSPACE/pelephysics-pr"
+          git submodule sync -- Submodules/PelePhysics
+          git submodule update --init --depth 1 -- Submodules/PelePhysics
+
+          echo "Submodule now points to:"
+          git -C Submodules/PelePhysics rev-parse --short HEAD
+
+      - name: Setup
+        run: |
+          echo "NPROCS=$(nproc)" >> $GITHUB_ENV
+          echo "CCACHE_COMPRESS=1" >> $GITHUB_ENV
+          echo "CCACHE_COMPRESSLEVEL=10" >> $GITHUB_ENV
+          echo "CCACHE_LOGFILE=${{github.workspace}}/ccache.log.txt" >> $GITHUB_ENV
+          echo "CCACHE_EXTRAFILES=${{github.workspace}}/PeleC/.clang-tidy" >> $GITHUB_ENV
+          echo "CCACHE_MAXSIZE=100M" >> $GITHUB_ENV
+          echo "CTCACHE_DIR=~/.cache/ctcache" >> $GITHUB_ENV
+
+      - name: Install Ccache
+        run: |
+          wget https://github.com/ccache/ccache/releases/download/v4.8/ccache-4.8-linux-x86_64.tar.xz
+          sudo curl https://raw.githubusercontent.com/matus-chochlik/ctcache/7fd516e91c17779cbc6fc18bd119313d9532dd90/clang-tidy-cache -Lo /usr/bin/clang-tidy-cache
+          tar xvf ccache-4.8-linux-x86_64.tar.xz
+          sudo cp -f ccache-4.8-linux-x86_64/ccache /usr/local/bin/
+          sudo chmod +x /usr/bin/clang-tidy-cache
+          mkdir -p ~/.cache/ctcache
+
+      - name: Set Up Ccache
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache
+          key: ccache-${{github.workflow}}-${{github.job}}-git-${{github.sha}}
+          restore-keys: |
+               ccache-${{github.workflow}}-${{github.job}}-git-
+
+      - name: Configure
+        working-directory: PeleC
+        run: |
+          cmake -B"${BUILD_DIR}" \
+          -DCMAKE_BUILD_TYPE:STRING=Release \
+          -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON \
+          -DCMAKE_CXX_COMPILER:STRING=clang++ \
+          -DCMAKE_C_COMPILER:STRING=clang \
+          -DPELE_ENABLE_MPI:BOOL=OFF \
+          -DPELE_ENABLE_FCOMPARE_FOR_TESTS:BOOL=OFF \
+          -DPELE_ENABLE_MASA:BOOL=OFF \
+          -DPELE_ENABLE_CLANG_TIDY:BOOL=ON \
+          -DPELE_EXCLUDE_BUILD_IN_CI:BOOL=ON \
+          -DCMAKE_CXX_COMPILER_LAUNCHER:STRING=ccache \
+          ${{github.workspace}}/PeleC
+
+      - name: Check
+        working-directory: ${{ env.BUILD_DIR }}
+        run: |
+          cmake --build . --parallel ${{ env.NPROCS }} 2>&1 | tee -a clang-tidy-full-report.txt
+          egrep "Warning:|Error:|warning:|error:" clang-tidy-full-report.txt \
+            | egrep -v "Submodules/amrex|Submodules/sundials|Submodules/AMReX-Hydro" \
+            | egrep -v "ld: warning:" | sort | uniq \
+            | awk 'BEGIN{i=0}{print $0}{i++}END{print "Warnings: "i}' > clang-tidy-warnings.txt
+
+      - name: Ccache Report
+        run: |
+          ls ~/.cache
+          ls ~/.cache/ccache
+          du -hs ~/.cache/ccache
+          ls ~/.cache/ctcache
+          du -hs ~/.cache/ctcache
+          ccache -s
+
+      - name: Full report
+        working-directory: ${{ env.BUILD_DIR }}
+        run: cat clang-tidy-full-report.txt
+
+      - name: Short report 
+        working-directory: ${{ env.BUILD_DIR }}
+        run: |
+          echo "::add-matcher::${{ github.workspace }}/PeleC/.github/problem-matchers/gcc.json"
+          cat clang-tidy-warnings.txt
+          export return=$(tail -n 1 clang-tidy-warnings.txt | awk '{print $2}')
+          exit ${return}