RFC: obstack_mark() and obstack_release()

[Roland McGrath]

> I can add to my list of things to do an attempt to merge gnulib
> obstack into glibc.

That's certainly a start, and it looks pretty trivial.

> I am not familiar with gcc obstack, though.

The differences there are more substantial and I didn't try to grok them
all.  Perhaps we can find someone from the GCC side who can explain what
matters and/or help with the harmonization.


Thanks,
Roland