https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87161
Bug ID: 87161 Summary: if -Werror appear after -Wmissing-prototypes the warning is not turn into error Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: nir.aizik at harman dot com Target Milestone: --- Werror before Wmissing-prototypes gives: g++ -c -Werror -Wmissing-prototypes test.c -o test.o cc1plus: error: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++ [-Werror] cc1plus: all warnings being treated as errors Werror after Wmissing-prototypes gives: g++ -c -Wmissing-prototypes -Werror test.c -o test.o cc1plus: warning: command line option ‘-Wmissing-prototypes’ is valid for C/ObjC but not for C++ I believe both options should end with error or at least this behavior should be documented