Currently gcc 4.8.4 does not bootstrap on darwin14 (Yosemite) due to pr61407. Would it be possible to apply the patch at https://gcc.gnu.org/bugzilla/attachment.cgi?id=33932 before 4.8.4 is released? Results with the patch are posted at https://gcc.gnu.org/ml/gcc-testresults/2014-12/msg02096.html.
TIA Dominique