[patch ada]: Fix PR/50942

[Dave Korn]

On 09/02/2012 18:55, Kai Tietz wrote:
> Hmm, I interpret 'ifeq ($(strip $(filter-out alpha64 ia64 dec hp vms%
> openvms% alphavms%,$(host))),)' as anthing not mentioned here.

  "If, after removing alpha64 ia64 dec hp vms% openvms% alphavms% (and stray
whitespace) from the host, what remains is equal to nothing" -> "If host
consists only of things in alpha64 ia64 dec hp vms% openvms% alphavms%".

  It's a slightly confusing construct I agree.  Watch out for the difference
between filter vs. filter-out and ifeq vs. ifneq, and note that that final
comma indicates there's an empty string as arg2 of the if condition.

    cheers,
      DaveK