[Bug c/66773] sign-compare warning for == and != are pretty useless

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66773

--- Comment #5 from Andreas Schwab <sch...@linux-m68k.org> ---
A cast is seldom a good solution, but even equality tests have the potential to
go wrong with C's composite type rules.