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Which platforms return a non-null pointer on malloc(0)

~~Hi,~~
I'm interested in the portability of `malloc(0);`.
- Which platforms return `NULL` without setting `errno`?
- Which platforms return a non-null pointer?
~~- Do any platforms have a behavior that I didn't list?~~
~~I'm especially interested in POSIX platforms, but I'd also appreciate information about non-POSIX ones.~~

What is the portability of `malloc(0);`?
- Which platforms return `NULL` without setting `errno`?
- Which platforms return a non-null pointer?
- Do any platforms have some other behavior?

c malloc

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