added missing __GNUC__ define for selfcheck

Author: firewave

.github/workflows/CI-unixish.yml

@@ -44,9 +44,11 @@ jobs:
 
       - name: Self check
         run: |
-          selfcheck_options="-q -j$(nproc) --std=c++11 --template=selfcheck --showtime=top5 -D__CPPCHECK__ -DCHECK_INTERNAL -DHAVE_RULES --error-exitcode=1 --inline-suppr --suppressions-list=.selfcheck_suppressions --library=cppcheck-lib -Ilib -Iexternals/simplecpp/ -Iexternals/tinyxml2/ --inconclusive --enable=style,performance,portability,warning,missingInclude,internal --exception-handling --debug-warnings --check-level=exhaustive"
+          selfcheck_options="-q -j$(nproc) --std=c++11 --template=selfcheck --showtime=top5 -D__CPPCHECK__ -D__GNUC__ -DCHECK_INTERNAL -DHAVE_RULES --error-exitcode=1 --inline-suppr --suppressions-list=.selfcheck_suppressions --library=cppcheck-lib -Ilib -Iexternals/simplecpp/ -Iexternals/tinyxml2/ --inconclusive --enable=style,performance,portability,warning,missingInclude,internal --exception-handling --debug-warnings --check-level=exhaustive"
           ec=0
           
+          # TODO: add --check-config          
+         
           # early exit
           if [ $ec -eq 1 ]; then
             exit $ec