__alloc_size
void *malloc(size_t) __malloclike __heedresult __alloc_size(1);
void *realloc(void *, size_t) __heedresult __alloc_size(2);
__alloc_align(1) __alloc_size(2);
void *reallocf(void *, size_t) __heedresult __alloc_size(2);
__alloc_size(1) __alloc_align(6);
__malloclike __heedresult __alloc_size(1);
__malloclike __heedresult __alloc_size(1);
const char *file, int line) __heedresult __alloc_size(2);
__malloclike __heedresult __alloc_size(1);
__malloclike __heedresult __alloc_size(1);
int flags) __heedresult __alloc_size(2);