[cfe-dev] aborting a compilation with illegal arguments

[Jonas Paulsson via cfe-dev]

Hi,

SystemZ only has vector support on z13, and therefore it does not make 
sense to pass the -fzvector option without specifying z13 as well. 
Currently, if compiling with clang, the compilation will abort during 
isel in cases where -fzvector is used incorrectly, but it seems best to 
abort early, in the FE, if possible.

I would like to ask how one would best handle this. SystemZTargetInfo 
has a vector feature, which it would make sense to check against. One 
could also check the CPU string, I guess.

/Jonas Paulsson