PSPP-BUG: [bug #25466] Compile problem on wilcoxon.c

[John Darrington]

Follow-up Comment #9, bug #25466 (project pspp):

> Do we really need to use setjmp()/longjmp() to break out of the algorithm
though? If we avoid that, by inserting occasional code sequences of the form
"if (timed_out()) return ERROR_CODE;", then it would be easy to make it
portable.

I did consider that when I first wrote this command.  I decided not to
because a) if we end up using routines from a third party library, then this
won't be available to us; b) Executing the test condition would have slowed
the system even more.

However, it might be the best option now that we have (possibly) a fast
algorithm of our own.

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