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Date: Mon, 31 Mar 2003 10:49:35 +0200
From: Stefan Farfeleder <stefan@fafoe.dyndns.org>
To: Ying-Chieh Liao <ijliao@FreeBSD.org>
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	questions@FreeBSD.org, current@FreeBSD.org
References: <20030331064605.GA42030@terry.dragon2.net>
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Subject: Re: isnan() with gcc 3.2.2 on FreeBSD 5.0-C
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On Mon, Mar 31, 2003 at 02:46:05PM +0800, Ying-Chieh Liao wrote:
> the following code snippet works fine with gcc 2.95.4 on RELENG_4
> but failed on my -current
> 
> <code>
> #include <iostream>
> #include <cmath>
> 
> using namespace std;
> 
> int main(void)
> {
>     cout << isnan(1.0) << endl;
>     return 0;
> }
> </code>
> 
> <err>
> test.cpp: In function `int main()':
> test.cpp:8: `isnan' undeclared (first use this function)
> test.cpp:8: (Each undeclared identifier is reported only once for each function
>    it appears in.)
> </err>
> 
> what's wrong with my system ? or what can I do for it ?

The isnan() macro is a new feature of C99 and thus not (yet) part of
C++.  Nevertheless you can use -D_GLIBCPP_USE_C99 to include this and
some other non-standard C++ features.

Regards,
Stefan Farfeleder