http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30162
--- Comment #54 from Janne Blomqvist <jb at gcc dot gnu.org> 2013-02-21 20:39:58 UTC --- I'd suggest to close the unformatted sequential part of this PR as WONTFIX. Maybe it worked sometime in the past for small record sizes when buffered IO was used for pipes, but that was by accident not by design. I think re-enabling buffering for pipes would open up a can of worms for very little benefit. A way to "properly" enable this would be to rework the IO library so that we know how much we're writing before writing the initial record marker (so that we don't need to seek back and fill in the correct value later), however that implies a rather major rework of how we do IO, so IMHO the benefit is not worth it.
