temporary simplecpp workaround

Author: Daniel Marjamäki

.github/workflows/gcc-versions.yml

@@ -34,4 +34,6 @@ jobs:
 
       - name: Build cppcheck
         run: |
-          docker run --rm -v ${{ github.workspace }}:/src -w /src ${{ matrix.image }} make -j$(nproc) CXXOPTS="-Werror" test
+          # FIXME: simplecpp-1.8.0 can't be compiled with gcc 5.4, so we can't run 'make test' now
+          #docker run --rm -v ${{ github.workspace }}:/cppcheck -w /cppcheck ${{ matrix.image }} make -j$(nproc) CXXOPTS="-Werror" test
+          docker run --rm -v ${{ github.workspace }}:/cppcheck -w /cppcheck ${{ matrix.image }} g++ -fsyntax-only -Iexternals -Iexternals/picojson -Iexternals/simplecpp -Iexternals/tinyxml2 -std=c++11 -Wno-multichar lib/*.cpp