[Bug libstdc++/69310] [6 Regression] Revision r232454 breaks bootstrap on x86_64-apple-darwin15

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69310

--- Comment #13 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> I can confirm that the following change allows current gcc trunk
> to bootstrap on x86_64-apple-darwin15.

I confirm also.