[PATCH] malloc: fix undefined behavior in obstack.h [BZ #32393]

[Paul Eggert]

On 2025-05-08 02:52, Sam James wrote:
> Paul, do you plan on pushing this?

No, because I found some problems with it. It didn't work in the Gnulib 
context, and there are nearby instances of other undefined behavior that 
normally work on typical machines but won't work on picky platforms and 
in theory might not even work on typical platforms.

I fixed all these problems in Gnulib recently.

What I was planning to do at some point was to sync Gnulib obstack to 
Glibc, as in the attached draft patch. Would this work for you?
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