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Postings from August 2001
Nicholas Clark <nick@ccl4.org>:
> I asked a friend to run
> perl -we 'use POSIX; print acos(3.7), "\n"'
>
> on an alpha running Debian GNU/Linux. He gets NaN rather
> than a core dump. He suggests building with -mieee in
> the cflags, which is what Debian use.
I recompiled the devel version of perl 5.6.1 to use
the -mieee flag. That prevented the SIGFPE.
[perl-5.7.2]$ ./perl -Ilib -e 'use POSIX; print acos(3.7), "\n"'
nan
[perl-5.7.2]$ perl -e 'use POSIX; print acos(3.7), "\n"'
Floating exception (core dumped)
[perl-5.7.2]$
> Is building with -mieee a sensible idea? If so, should
> it be on by default on Alpha linux?
Frankly, I don't know. If Debian does it and since
it prevents this signal from occuring, then I would
recommend it. I don't know enough of the consequences
for that to be a solid recommendation.
Andrew
dalke@dalkescientific.com
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