From documentation:
Presently, only certain target debugging environments will support reverse debugging. Those targets currently include:
- Native i386-linux ('target record')
- Native amd64-linux ('target record')
- Several remote targets, including:
- moxie-elf simulator
- Simics
- VMware Workstation 7.0
- the SID simulator (xstormy16 architecture)
- chronicle-gdbserver using valgrind
- UndoDB
Your target: x86_64-apple-darwin12
is none of the above.
Sorry, not implemented :-(