[Bug bootstrap/56703] problems with strsignal and maybe strstr due to varying const on return type

[yves.caniou@ens-lyon.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56703

--- Comment #6 from Yves Caniou <yves.caniou@ens-lyon.fr> ---
(In reply to Eric Gallager from comment #5)
> (In reply to Yves Caniou from comment #4)
> > I have the same issue with gcc-4.8.2 compiling gcc-4.8.2, on a Intel(R)
> > Xeon(R) CPU E5-2630 0 @ 2.30GHz.
> 
> What about with a newer, still-supported version?

At the moment, I only have sys-devel/gcc v-7.3.0-r3 installed, and compiled
with itself. The other supported version of gcc at the moment is 6.4.0-r1.
What do you want me to try exactly?