--- Comment #8 from Andrew Pinski <pinskia at gcc dot> ---
(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.

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