Collect gcc warnings as reports #4792
Description
Compiler warnings can be considered as checkers, since they are also indicating suspicious constructions in the source code. In case of clang compiler the warnings are available as clang-diagnostic-... checkers.
This feature should be available for gcc compiler, too. The gcc warnings (gcc --help=warnings) should be exposed on CodeChecker interface as gcc-diagnostic-... checkers when running CodeChecker checkers --analyzers gcc. Also, it should be possible to enable/disable them when --enable/--disable flags are used respectively.