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Date: Wed, 13 Jul 2005 23:29:00 -0000
From: Joe Buck <Joe.Buck@synopsys.COM>
To: Hiroshi Fujishima <hiroshi.fujishima@gmail.com>
Cc: Eric Botcazou <ebotcazou@libertysurf.fr>, gcc@gcc.gnu.org
Subject: Re: isinf
Message-ID: <20050713232903.GA14174@synopsys.com>
References: <7cfyui3a9r.fsf@gmail.com> <200507132109.47367.ebotcazou@libertysurf.fr> <7cr7e2uyki.fsf@gmail.com> <200507140101.15197.ebotcazou@libertysurf.fr> <7c64vee1qg.fsf@gmail.com>
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On Thu, Jul 14, 2005 at 08:16:07AM +0900, Hiroshi Fujishima wrote:
> Eric Botcazou <ebotcazou@libertysurf.fr> writes:
> 
> >> The configure script which is included in rrdtool[1] checks whether
> >> the system has isinf() as below.
> >>
> >> #include <math.h>
> >> int
> >> main ()
> >> {
> >> float f = 0.0; isinf(f)
> >>   ;
> >>   return 0;
> >> }
> >
> > The test is clearly fragile.  Assigning the return value of isinf to a 
> > variable should be sufficient for 4.0.x at -O0.
> 
> Yes, I contact rrdtool maintainer.  Thank you.

Best to make it a global variable, to guard against dead code elimination.