http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54206
--- Comment #2 from Andi Kleen <andi-gcc at firstfloor dot org> 2012-08-09 12:39:14 UTC --- I didn't do it, but I had to debug a user's gcc config who did it. WONTFIX would be wrong, if you really don't support it error out in configure please instead of silent breakage (glibc does that). But fixing it would be better I think.