gcc 4.6 (as used in Fedora 15) adds some extra warnings which are included with Werror. The new unused-but-set variable warning causes an error in the libasm of elfutils.
We'll need a fix for this in a Bernard point release.
Pull request sent for oe-core: http://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/commit/?h=josh/bernard-f15&id=65a1eaf069608ceb4e1fafb4499f5e217dc95505
Pending in staging http://git.yoctoproject.org/cgit/cgit.cgi/poky-contrib/commit/?h=stage/bernard_1.0.1&id=65a1eaf069608ceb4e1fafb4499f5e217dc95505
Bernard: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?h=bernard&id=65a1eaf069608ceb4e1fafb4499f5e217dc95505
Verify fixed for some time