[Bug bootstrap/89864] gcc fails to build/bootstrap with XCode 10.2

[juergen.reuter at desy dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89864

--- Comment #80 from Jürgen Reuter <juergen.reuter at desy dot de> ---

> A little late to the party, but this revised patch worked for me on
> 10.4.4/Xcode10.2 with gcc8.3.0, gcc7.4.0, and gcc6.5.0.  fftw3-3.3.8 built
> and passed all tests against the patched gcc8 and gcc7.  cernlib built
> against the patched gcc6.

Never too late for an important confirmation.^^
LLVM now builds (after solving unrelated PR90124, its tests are running
(45%done). Looks good.