[Bug bootstrap/77917] ARM/AARCH64 bootstrap-lto fails

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77917

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to PeteVine from comment #7)
> BTW, I sincerely hope `--with-build-config=bootstrap-lto` is not derailed by
> the presence of `-flto` among environment C(XX)FLAGS, as otherwise it
> definitely makes sense for configure to always sanitize those flags.

With --with-build-config=bootstrap-lto you will not need -flto in C(XX)FLAGS. 
Really -flto in C(XX)FLAGS is the cause of the problem you are running into.