https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87161
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|c++ |driver
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This isn't specific to -Wmissing-prototypes or to C++, it happens for any
option that isn't valid for the current language e.g.
g++ -Werror -Wduplicate-decl-specifier ...
gcc -Werror -Wc++14-compat ...
The behaviour is fairly intuitive. While processing the command-line arguments
if an unknown/invalid option is encountered there is a warning. After -Werror
has been seen, all warnings are errors (including warnings about
unknown/invalid options).
