[Discuss-gnuradio] Porting from 3.6.something

I am toying with the hypothetical idea of bringing a large and fragmented OOT codebase out of the stone age.  I remember hearing about a tool that would convert Cpp blocks from 3.6 to the 3.7 API.  Was that a real thing?

Also, what will 3.8 break and will everyone think less of me if I spend 4-5 years on 3.7?   :)

-John