http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46626
--- Comment #4 from Zdenek Sojka <zsojka at seznam dot cz> 2010-12-08 00:43:03 UTC --- This seems to cause FAILs in libstdc++ testsuite with -O0, for example: $ g++ 42819.ii -std=gnu++0x $ ./a.out terminate called after throwing an instance of 'std::system_error' what(): Unknown error 18446744073709551615 Aborted (all failures I encountered are from 30_threads)