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Re: Broken isnan(3) and/or DQNAN on Tru64

From: Ludovic Courtès
Subject: Re: Broken isnan(3) and/or DQNAN on Tru64
Date: Mon, 04 May 2009 00:54:56 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.90 (gnu/linux)


Bruno Haible <address@hidden> writes:

>> So people compiling with GCC on this platform should pass `-mieee'
>> (`configure' could add it automatically.)
> The gnulib module 'fpieee' adds it automatically.

This module appears to be overzealous: `gl_FP_IEEE' just checks for the
host CPU, but on alpha*-linux-gnu, `-mieee' is apparently not needed:

--8<---------------cut here---------------start------------->8---
#include <math.h>

main (int argc, char *argv[])
  return isnan (NAN);
--8<---------------cut here---------------end--------------->8---

Compiled with GCC 4.2.4 on Debian GNU/Linux on Alpha, it returns 1.

Or maybe that's a Debian patch that enables `-mieee' by default?


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