Provided by: libsdl3-doc_3.2.28+ds-1_all 

NAME
SDL_ALLOC_SIZE - A macro to tag a function as returning a certain allocation.
SYNOPSIS
#include <SDL3/SDL_begin_code.h>
#define SDL_ALLOC_SIZE(p) __attribute__((alloc_size(p)))
DESCRIPTION
This is a hint to the compiler that a function allocates and returns a specific amount of memory based on
one of its arguments. For example, the C runtime's malloc() function could use this macro with an
argument of 1 (first argument to malloc is the size of the allocation).
On compilers without alloc_size support, this is defined to nothing.
Most apps don't need to, and should not, use this directly.
AVAILABILITY
This macro is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.28 SDL_ALLOC_SIZE(3)