http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51785
--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-01 13:30:26 UTC --- f17 doesn't include glibc 2.16, just patched glibc 2.15, which doesn't have these header changes yet. The thing I don't like on the last patch is that it hardcodes configure time tests, so when glibc is upgraded say from 2.15 to 2.16, but gcc isn't upgraded, suddenly anything that includes <cstdio> fails to compile. So I'd prefer something like #c14 patch instead, perhaps testing a macro that is depending on __GLIBC_PREREQ defined in linux os-defines.h. Can you please resolve this either way till tomorrow noon UTC (4.7 branching/4.7.0-rc1)? Thanks.