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Re: isinf

From: Andreas Schwab <schwab at suse dot de>
To: Jakub Jelinek <jakub at redhat dot com>
Cc: Hiroshi Fujishima <hiroshi dot fujishima at gmail dot com>,Michael Veksler <VEKSLER at il dot ibm dot com>,Eric Botcazou <ebotcazou at libertysurf dot fr>, gcc at gcc dot gnu dot org,Joe Buck <Joe dot Buck at synopsys dot com>
Date: Thu, 14 Jul 2005 11:47:26 +0200
Subject: Re: isinf
References: <OFC182F25F.CB9B8299-ON4325703E.002AD458-4325703E.002BA172@il.ibm.com><jeirzd3grp.fsf@sykes.suse.de> <7c3bqhkaad.fsf@gmail.com><20050714093542.GS4740@sunsite.mff.cuni.cz>

Jakub Jelinek <jakub@redhat.com> writes:

> Guess that's because AC_HAVE_FUNCS(isinf) is wrong.
> isinf/isfinite/fpclassify are all documented as macros in ISO C99.
> So
>    [AC_MSG_CHECKING(for isinf with <math.h>)
>      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>
> volatile int x; volatile float f;]], [[x = isinf(f)]])],[AC_MSG_RESULT(yes)
>        AC_DEFINE(HAVE_ISINF)],[AC_MSG_RESULT(no)])])
> should be reasonably safe for now.

Perhaps it should just check whether the macro isinf exists (but still use
AC_CHECK_FUNCS(isinf) for pre-C99 hosts).

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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"And now for something completely different."

References:
- Re: isinf
  - From: Michael Veksler
- Re: isinf
  - From: Andreas Schwab
- Re: isinf
  - From: Hiroshi Fujishima
- Re: isinf
  - From: Jakub Jelinek

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