http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50153
--- Comment #6 from Steve Ellcey <sje at cup dot hp.com> 2011-08-22 23:31:20 UTC --- I am testing an inclhack.def header file fixup for abs. I am not sure if any of the other header files checks on __cplusplus will be a problem but fixing the abs problem should get us bootstrapping again.
