This fails on one of our bots: https://lab.llvm.org/buildbot/#/builders/120/builds/6309 llvm-jitlink error: Unsupported target machine architecture in COFF object The other bot doesn't run the test at all it seems but I can't explain why. It's also possible that I'm mistaken and the mostly native but still "cross compiling" setup we have on WoA means an x86 object is produced sometimes (perhaps because a default triple is still x86).