[Bug middle-end/87220] -fstack-check produces inefficient and wrong tests

[schwab@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87220

--- Comment #14 from Andreas Schwab <schwab@linux-m68k.org> ---
(In reply to Rich Felker from comment #9)
> FWIW, glibc supports building with -fstack-check and seems to be attempting
> to use it for this purpose too. See for example
> https://sourceware.org/bugzilla/show_bug.cgi?id=21253

Glibc does not use -fstack-check, this is a gentoo local setting.