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Currently top of tree is top of tree and no backwards compatibility, other than the C backend, is promised. I think that instead of asserting that you need to check in conditional compilation for a backend, perhaps, you would be open to other options to accomplish the same needs? My suggestion would be to check in or make some branches for the two older versions and then apply your patches on top

Is there a convention for how the LLVM community prefers to have conditional compilation in code intended to be checked in to llvm.org? Our goal is a single code base that can support multiple LLVM revisions, including LLVM TOT. In the long run, of course, we'll simply be able to refer to the backend revision that corresponds to the revision of LLVM in use. If fixes between TOT and that older