We’re about to undertake the same task. We’re hooking our legacy Pascal, COBOL, and BASIC compilers
into LLVM and will need the same things. Right now, we’re not doing much debug info as we’re just in
the “firstboot” stage of OpenVMS on x86, but will be working this area within in the next 6 months.
[We were talking about this just this morning before I read your list posting]
If you’d like to collaborate on some of the areas that Paul mention, drop me a line!