http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54419
--- Comment #32 from Marc Glisse <glisse at gcc dot gnu.org> 2012-09-05 10:46:35 UTC --- (In reply to comment #30) > > Er, why should this test ever be run with the system compiler? libstdc++ > > should > > only ever be built by a newly built g++. > > The problem is not with the compiler, but with the (target?) assembler and > possibly the target CPU. Er, did you read comment #26? Jack says the configure test is being run with clang, which if true looks like a bug. (doesn't change the fact that this PR is about assembler support, but sometimes studying one bug unearths other bugs)