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Did I work with you!? I also worked on the COBOL backend for TR. And yeah, I'd also be HIGHLY surprised if it ever got open-sourced.

We must have just missed each other. I started in January 2014.

Thanks for the insight. I strongly suspect the COBOL compiler buyers are really just buying ongoing support and updates. Open sourcing should result in minimal revenue impact, but shared code might make it quite problematic license wise. Wouldn’t blame them for turning down that headache.

> I worked on the IBM COBOL compiler in a past life. It's not LLVM based; the optimizer and code generator are derived from J9, the IBM JVM.

Does it have anything in common with XL C? Does it use W code as an intermediate language?

And what language is it written in? (PL/X? PL.8? C/C++?)

Assuming nothing's changed since I left, the front-end is taken from the old COBOL compiler, and is written in PL/X. It emits WCode for the backend, which is written in C++.

XL C is a separate codebase, with very little shared code IIRC.