[Bug c/7652] -Wswitch-break : Warn if a switch case falls through

[fweimer at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=7652

--- Comment #25 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Matthew Woehlke from comment #22)

>   case B:
>     ...
>     [[gcc:fallthrough]] // suppress warning for fall-through to 'case C'

Do we have such attributes in the C compiler?

I contemplated using any comment whatsoever as an indicator that fall-through
is expected.

In the end, need general (syntax-based) unreachable-code detection, so that
return statements and no-return functions suppress the warning as well, and so
on.  At least if this will be part of -Wall.