[tz] [PATCH] * zdump.c: Tune performance of -c with large numbers on 64-bit hosts.
dot at dotat.at
Thu Aug 15 08:59:06 UTC 2013
Paul Eggert <eggert at cs.ucla.edu> wrote:
> +#define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \
> + + SECSPERLYEAR * (intmax_t) (100 - 3))
i.e. 12 622 780 800
> + if (INTMAX_MAX / SECSPER400YEARS < diff400)
> + return absolute_max_time;
I think this is a constraint violation on 32 bit systems that don't have
long long (e.g. C89), so it ought to cause a compilation error.
C99 section 6.6 "constant expressions" paragraph 4 under "constraints"
Each constant expression shall evaluate to a constant that is in the
range of representable values for its type.
C89 has the same requirement.
I think (sadly) you'll have to use #ifdef on SECSPER400YEARS_FITS
f.anthony.n.finch <dot at dotat.at> http://dotat.at/
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occasionally poor at first.
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