[Bug c/116087] Add optional warning for too large macro expansion

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116087

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note this is not the first time someone has run into macro explosion, see PR
10323 and PR 19411, back when the altivec header was using macros .

I suspect you could run into something similar with macros defined in tgmath.h
.