The attached patch fixes a glicht in the error message generated
for invalid values of enum options.  When a "DriverOnly" option
was passed directoy top the compiler, it would still list that as
valid in the error message, e.g. on s390:

  $ cc1 <...> -march=native
  cc1: error: unrecognized argument in option ‘-march=native’
  cc1: note: valid arguments to ‘-march=’ are: g5 g6 native z10 z13 z196 z9-109 z9-ec z900 z990 zEC12

The patched code prints DriverOnly enum values only when the
driver generates the error message.

Ciao

Dominik ^_^  ^_^

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Dominik Vogt
IBM Germany