[Bug target/57438] bootstrap fails on x86_64 darwin in stage2 linking cc1

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57438

--- Comment #29 from Iain Sandoe <iains at gcc dot gnu.org> ---

posted 
https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00541.html

I have backports for 6.x and 5.x if wanted.