[RFC PATCH] realloc: Make REALLOC_ZERO_BYTES_FREES into a tunable

[Paul Eggert]

On 2024-10-25 15:58, Alejandro Colomar wrote:
> The purpose of the change was
> to prevent vulnerabilities, not to promote the use of null pointers as
> 0-sized objects.

Not sure I agree about the purpose. Lots of GNU code has used null 
pointers as zero-sized objects for years. It's a natural consequence of 
starting off a (pointer,size) pair as both zero, and it's been 
documented as a Gnulib assumption since 2003 (code assumed it even 
before that).

If compilers start warning about this sort of thing we'll shut off the 
warnings. It wouldn't be the first time compilers chattered 
counterproductively.