[Bug c/112463] ternary operator / -Wsign-compare inconsistency

[vincent-gcc at vinc17 dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112463

--- Comment #3 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Andrew Pinski from comment #2)
> One problem with -Wsign-conversion is that it is not enabled with
> -Wextra/-Wall .

However, I don't understand why -Wsign-compare is enabled by -Wextra but not
-Wsign-conversion, while these are similar warnings.

Note that when compiling GNU MPFR, *both* give lots of false positives (which
could be avoided, at least for most of them, if PR38470 were fixed).