With clang 14.0.0 this compiles:

#include <stdlib.h>

void fr(char* x) {
  free(x);
}

__attribute__((malloc)) char * al() {
  return (char*) malloc(10);
}

int main() {
  char* x = al();
  fr(x);
  return 0;
}

and this fails:

#include <stdlib.h>

void fr(char* x) {
  free(x);
}

__attribute__((malloc, malloc(fr, 1))) char * al() {
  return (char*) malloc(10);
}

int main() {
  char* x = al();
  fr(x);
  return 0;
}

a.c:7:25: error: 'malloc' attribute takes no arguments
 __attribute__((malloc, malloc(fr, 1))) char * al() {
                        ^
1 error generated.

GCC does accept the malloc (deallocator, ptr-index) form.

Please extend clang to accept the malloc (deallocator, ptr-index) __attribute__(()) form. It shall at least ignore it, rather than throwing an error for wrong syntax. This way the malloc (deallocator, ptr-index) form can always be used, irrespective of the compiler. Some compilers will handle it, other will ignore it.

Missing support for GCC's attribute malloc (deallocator) and malloc (deallocator, ptr-index) #53152

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