http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55083
--- Comment #4 from Perry Smith <pedzsan at gmail dot com> 2012-12-09 04:45:47 UTC --- I can't remember much about this. Things may have changed since I reported it. Is the Makefile created as the last step? If not, then if something fails after the Makefile is created, then the next build will assume everything in that section completed successfully (which will be incorrect).