diff --git a/.github/workflows/selfcheck.yml b/.github/workflows/selfcheck.yml
index c1b4a1548..e820a32d6 100644
--- a/.github/workflows/selfcheck.yml
+++ b/.github/workflows/selfcheck.yml
@@ -28,6 +28,11 @@ jobs:
         with:
           key: ${{ github.workflow }}-${{ runner.os }}
 
+      - name: Install missing software
+        run: |
+          sudo apt-get update
+          sudo apt-get install clang-14 valgrind
+
       - name: Cache Qt ${{ env.QT_VERSION }}
         id: cache-qt
         uses: actions/cache@v1  # not v2!
@@ -46,7 +51,12 @@ jobs:
       - name: Self check (build)
         run: |
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
-          make -j$(nproc) -s CXXFLAGS="-O2 -w -DHAVE_BOOST" MATCHCOMPILER=yes
+          # valgrind cannot handle DWARF 5 yet so force version 4
+          # work around performance regression with -inline-deferral
+          make -j$(nproc) -s CXXFLAGS="-O2 -w -DHAVE_BOOST -gdwarf-4 -mllvm -inline-deferral" MATCHCOMPILER=yes
+        env:
+          CC: clang-14
+          CXX: clang++-14
 
       - name: CMake
         run: |
@@ -88,3 +98,36 @@ jobs:
           ./cppcheck -q --template=selfcheck --error-exitcode=1 --library=cppcheck-lib --library=qt -D__CPPCHECK__ -D__GNUC__ -DQT_VERSION=0x050000 -DQ_MOC_OUTPUT_REVISION=67 --enable=unusedFunction --exception-handling -rp=. --project=cmake.output.notest/compile_commands.json --suppressions-list=.selfcheck_unused_suppressions --inline-suppr
         env:
           DISABLE_VALUEFLOW: 1
+
+      - name: Fetch corpus
+        run: |
+          wget https://github.com/danmar/cppcheck/archive/refs/tags/2.8.tar.gz
+          tar xvf 2.8.tar.gz
+
+      - name: CMake (corpus / no test)
+        run: |
+          cmake -S cppcheck-2.8 -B cmake.output.corpus -G "Unix Makefiles" -DHAVE_RULES=On -DBUILD_TESTS=Off -DBUILD_GUI=ON -DWITH_QCHART=ON -DENABLE_CHECK_INTERNAL=On -DCMAKE_GLOBAL_AUTOGEN_TARGET=On
+
+      - name: Generate dependencies (corpus)
+        run: |
+          # make sure the precompiled headers exist
+          make -C cmake.output.notest lib/CMakeFiles/lib_objs.dir/cmake_pch.hxx.cxx
+          # make sure auto-generated GUI files exist
+          make -C cmake.output.corpus autogen
+          make -C cmake.output.corpus gui-build-deps
+
+      # TODO: find a way to report unmatched suppressions without need to add information checks
+      - name: Self check (unusedFunction / corpus / no test / callgrind)
+        run: |
+          # TODO: fix -rp so the suppressions actually work
+          valgrind --tool=callgrind ./cppcheck --template=selfcheck --error-exitcode=0 --library=cppcheck-lib --library=qt -D__GNUC__ -DQT_VERSION=0x050000 -DQ_MOC_OUTPUT_REVISION=67  --enable=unusedFunction --exception-handling -rp=. --project=cmake.output.corpus/compile_commands.json --suppressions-list=.selfcheck_unused_suppressions --inline-suppr 2>callgrind.log || (cat callgrind.log && false)
+          cat callgrind.log
+          callgrind_annotate --auto=no > callgrind.annotated.log
+          head -50 callgrind.annotated.log
+        env:
+          DISABLE_VALUEFLOW: 1
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: Callgrind Output
+          path: ./callgrind.*