[Bug c/80378] Extend alloc_size attribute for better Linux kernel checking

[amonakov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80378

--- Comment #7 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This sounds like a separate problem that is solvable via __builtin_constant_p? 
For example:

    void link_error(void) __attribute__((error("size check failed")));

    if (__builtin_constant_p(size) && size-0ul >= MAX_ALLOC_SIZE)
      link_error();