quux_t *foo(int i) {
      /* Trick to prevent compiler from inlining */
      if(i == 0) {
          quux_t *bar = (quux_t *) malloc(sizeof(quux_t));
          return bar;
      } else {
          return foo(0);
      }
  }

Seriously? GCC removes this obfuscation at -O2, Clang does it at -O1. Check the disassembly before making stupid claims like this.