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> 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++?)

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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.

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