http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52201
--- Comment #4 from Andrew Macleod <amacleod at redhat dot com> 2012-02-24 19:47:18 UTC --- Created attachment 26746 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26746 disable tests if no atomic support present That test case really shouldn't be running. To make sure we're on the right track, add the line // { dg-require-atomic-builtins "" } at the top of the test case (patch attached for the 2 you mention) Presumably it won't execute the test case anymore, thus avoiding the failure... Can you give it a try? Are those the only 2 failing? interesting.