$ icc -xHost -msse icc: command line warning #10120: overriding '-xHost' with '-msse' icc: command line error: no files specified; for help type "icc -help" $ icc -fast -msse icc: command line error: no files specified; for help type "icc -help"
Because -fast is short for -xHost and some other options, it should also warn that -msse overrides.