I noticed guile mktime includes errno in its error report, but I don't
think the C mktime sets errno.
For instance in guile 1.6.3 built on a recent i386 debian with glibc
2.3.1, a little foo.scm
(readdir (opendir "."))
(define tm (gmtime (current-time)))
(set-tm:year tm -123)
(mktime tm "GMT")
run with "guile -s foo.scm" gives the rather curious
ERROR: In procedure mktime:
ERROR: Success
Who'd have thought success was an error :-).
Of course readdir has set errno to 0 as part of its normal operation,
and mktime has returned -1 for a bogus tm_year, but not set errno.
I'm not actually sure what the standards say about mktime and errno,
but a draft of C99 I've seen doesn't mention it setting errno, and
certainly in glibc 2.3.1 it doesn't seem to get set.
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