[Bug bootstrap/82300] Bootstrapping gcc-8 does not work on darwin

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82300

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-09-22
     Ever confirmed|0                           |1

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
I see a similar problem on darwin16, Xcode 9, bootstrapped with an older
version of gcc-8:

In file included from ./tm.h:16:0,
                 from ../../work/gcc/genpreds.c:26:
 ./options.h:5803:2: error: #error too many target masks
  #error too many target masks

at stage 1, r253008 is OK.