[musl] BUG: realloc(p,0) should be consistent with malloc(0)

[Paul Eggert]

On 2025-06-16 05:24, Rich Felker wrote:
> Do you have numbers for how many packages have actually pulled in the
> updated gnulib and shipped with it? With this change, do you have it
> replacing realloc on glibc, so that the new realloc actually gets
> used? I would expect yes;

I don't have numbers, but I've helped to release new GNU coreutils, 
diffutils, grep, and gzip with the new Gnulib. No realloc-related 
problems have been reported. I expect other GNU apps have also been 
released with the new Gnulib.

The new Gnulib replaces all app calls to realloc on platforms like glibc 
where realloc does not have the desired behavior. It does not replace 
realloc calls within libraries that are linked to.

Since these GNU apps are designed to be portable to musl etc. I would 
not have expected the new Gnulib behavior to change observable app 
behavior. The Gnulib change is mostly there to mask out any (unlikely) 
bugs that would occur if a GNU app incorrectly assumed the current Glibc 
realloc behavior (which is obviously bogus).