string_reverse(undef);

Does that actually free() the memory ?
I would be wanting to see proof that the if(output != NULL){} block is being entered:

  if(output != NULL) {
    free(output);
    printf("YES - output was free()ed\n");
  }
[download]

I guess that the $ffi->attach() line might somehow provide the necessary magic.

Note: I've just installed FFI::Platypus (Windows 11, perl-5.36.0) - it required some force, and installed a shudderingly disturbing amount of Alien::* (and other) shit.
But I couldn't quickly get anywhere with the demo that you supplied. Does that demo comprise 2 separate files ? If so, how are they linked ?

I've no experience with GC_MALLOC, and hadn't even heard of it.
I'll read, with interest, the thoughts of any who might have used this.

In the Inline::C/XS environment, if I want to avoid having to explicitly free/Safefree memory, then I'll create objects blessed into a specific package and have perl automagically free/Safefree the objects as perl sees appropriate.

Cheers,
Rob

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