Comment 1 for bug 1860575

Your analysis of the problem with family makes sense & we do have mechanism to fix this in QEMU while keeping back compat for existing deployments.

I'm curious as to the actual errors LLVM reports ?

FWIW, even though qemu64 is the default CPU, practically everyone would be better off choosing one of the other CPU models explicitly to better suit their desired use case. There is some guidance here https://qemu.weilnetz.de/doc/qemu-doc.html#cpu_005fmodels