[Bug c++/87656] Useful flags to enable with -Wall or -Wextra

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87656

--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to krux from comment #3)
> -Wshadow, at least the local variant, would indeed be really nice in -Wall
> or at least -Wextra. The global one is still too noisy because of class
> constructors: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78147
> I always use -Wall -W -Wshadow -Wconversion -Wsign-conversion.

There's 2 local variants, 1 for compatible locals and 1 for any locals. Which
one do you mean? Actually that reminds me, I'd like that distinction for
globals, too: 

        compatible                 | doesn't matter           |
        ___________________________|__________________________|
local  | -Wshadow=compatible-local | -Wshadow=local           |
-----------------------------------+--------------------------|
global | ???                       | -Wshadow (+nothing else) |
--------------------------------------------------------------|

i.e. come up for something for the "???" box. (But I guess that's an issue for
another bug)