[Bug bootstrap/89864] [9 regression] gcc fails to build/bootstrap with XCode 10.2

[schnetter at gmail dot com]

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

--- Comment #20 from Erik Schnetter <schnetter at gmail dot com> ---
I have a patch that works for 8.3.0. It doesn't work for 9.0.0 (i.e. an svn
checkout); I'm working on this.