http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50982
--- Comment #10 from David Edelsohn <dje at gcc dot gnu.org> 2011-11-03 20:49:52 UTC --- Actually, my previous successful bootstrap was for rev 180770. I happened to catch you in the middle of your checkins, but before the libgcc changes. http://gcc.gnu.org/ml/gcc-testresults/2011-11/msg00246.html That was successful, so it either must be do to your patch or a later change. Is there some logic about which include directories implicitly are C++ vs C header files? It now is finding gthr.h, gthr-default.h and gthr-posix.h in libstdc++ include/bits.