[PATCH 0/5] obstacks again

[Paul Eggert]

Alan Modra wrote:

> One thing though, I didn't put the ChangeLog diffs in the patch as I
> usually add them when committing.

Oh, I missed that.  I added them now.  For Gnulib it's better to put them into 
the patch.

> It is no longer possible to shrink an obstack with obstack_blank (but
> you can still do that with obstack_blank_fast).

Ouch, I hadn't noticed that.  That's an incompatible change and I expect it will 
break real-world usage for no particularly good reason, so we really need to fix 
this.  How about making the 2nd argument to obstack_blank and obstack_blank_fast 
be of type ptrdiff_t rather than size_t?