tberghammer added a comment. I agree that it can be specified by CFALGS and CXXFLAGS but we will need some way in the test suit to xfail a test based on the instruction set and sometime we also need different test expectations based on it. Doing these based on C(XX)FALGS is a bit problematic so this is why I suggesting to represent them as different architectures. An other valid solution would be to add a new argument to the test system where we can specify the instruction set but it is more work and I am not sure if it worth the effort.
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