[Bug malloc/12547] realloc(p, 0) violates C99

[bruno at clisp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=12547

--- Comment #18 from Bruno Haible <bruno at clisp dot org> ---
Now that ISO C 23 specifies that realloc (p, 0) with p != NULL is undefined
behaviour, I have  pledged the gcc and clang sanitizer developers to catch this
case of undefined behaviour at runtime:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117233
https://github.com/llvm/llvm-project/issues/113065

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