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From: NightStrike <nightstrike@gmail.com>
Date: Wed, 12 Jan 2022 13:36:27 -0500
Message-ID: <CAF1jjLsATz+t6idB_RRfGTfjLPpg-oD26zgv48GL+vq0ihnrFQ@mail.gmail.com>
Subject: Re: Better diagnostic for shadowed function?
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: gcc-help <gcc-help@gcc.gnu.org>
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On Wed, Jan 12, 2022 at 5:06 AM Jonathan Wakely <jwakely.gcc@gmail.com> wro=
te:
>
> On Wed, 12 Jan 2022 at 06:34, NightStrike via Gcc-help
> <gcc-help@gcc.gnu.org> wrote:
> >
> > I recently hit this problem:
> >
> > #include <strings.h>
> > void f() {
> >     index[0] =3D 0;
> > }
> >
> > #gcc is 11.2.0
> > gcc -c a.c
> > a.c:4:7: error: subscripted value is neither array nor pointer nor vect=
or
> >     4 |  index[1] =3D 0;
> >       |       ^
> >
> > -Wshadow (or all or extra) did not highlight that "index" was actually
> > a function from strings.h.  For the future, is there anything I could
> > have done to make gcc tell me what the real error was?
>
> g++ is *slightly* more help:
> s.c:3:10: error: invalid types =E2=80=98<unresolved overloaded function
> type>[int]=E2=80=99 for array subscript
>
> This at least gives you a hint it's a function, so probably declared
> somewhere in a header. The C front end could do the same, saying
> "subscripted value is a function", but it just has a generic
> diagnostic for all un-subscriptable types. Asking for that to be
> improved seems like a good use of a bugzilla PR.
>
> Maybe would make sense for us to also add a note telling you where
> 'index' was declared, as long as it doesn't get suppressed without
> -Wsystem-headers !

Added as https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103996

Thanks!