[PATCH] Initialize the entire obstack struct [BZ #17919]

[Siddhesh Poyarekar]

On Tue, Feb 03, 2015 at 11:49:26AM -0500, Carlos O'Donell wrote:
> IMO zero-initialized padding, for this case, isn't something you can
> expect. Therefore I think it's a compiler bug.

Thanks, I've filed a bug now:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64923

> I think it's OK to work around this in glibc, but it needs a comment
> with a reference to the filed gcc bug. I do not think it is valid
> for gcc on s390x to use the entire bit field along with padding and
> I believe it could result in incorrect operation.

Nothing is breaking due to this right now, so we could probably wait
and see what the gcc folks think of this.

Siddhesh
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