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According to Rugxulo on 8/21/2009 11:27 PM:
>> However, the whole point of using 'return $ac_retval' without a subshell
>> is to avoid forking, and catering to bash 2.04 brokenness (if it is indeed
>> a bash bug fixed for 2.05a, as I suspect) is a step backwards.
> 
> You really think that this will slow everything down? Have you tested
> it on your machine? (hint hint)    :-)

Yes I have tested it on cygwin, and yes it made a difference, which is why
we committed the patch in the first place.  Seriously - the cost of a
subshell is VERY measurable, and doing anything to avoid a subshell will
have NOTICEABLE differences in the running time of a configure script.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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