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From: Andreas Schwab <schwab@suse.de>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Hiroshi Fujishima <hiroshi.fujishima@gmail.com>,
	Michael Veksler <VEKSLER@il.ibm.com>,
	Eric Botcazou <ebotcazou@libertysurf.fr>, gcc@gcc.gnu.org,
	Joe Buck <Joe.Buck@synopsys.com>
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>
X-Yow: Will it improve my CASH FLOW?
Date: Thu, 14 Jul 2005 09:47:00 -0000
In-Reply-To: <20050714093542.GS4740@sunsite.mff.cuni.cz> (Jakub Jelinek's
	message of "Thu, 14 Jul 2005 11:35:42 +0200")
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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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