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Date: Sat, 25 Oct 2003 23:39:22 +0200
From: "Eli Zaretskii" <eliz AT elta DOT co DOT il>
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To: "Richard Dawe" <rich AT phekda DOT freeserve DOT co DOT uk>
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	(rich AT phekda DOT freeserve DOT co DOT uk)
Subject: Re: Clash between math.h and ieeefp.h [PATCH]
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> Date: Sat, 25 Oct 2003 20:16:28 +0100
> From: "Richard Dawe" <rich AT phekda DOT freeserve DOT co DOT uk>
> 
> libstdc++ from gcc 3.2.1 fails to build, because there are clashes
> between math.h and ieeefp.h. The culprits are the macros
> isnan and isinf defined in <math.h>. ieeefp.h  declares functions
> called isnan and isinf. If <math.h> is included before ieeefp.h,
> a parse error will occur, because of the macro expansion
> of isnan and ininf.
> 
> Below is a patch to fix this. Since isnan and isinf are now macros,
> I've removed the declaration of their functions.

I'm probably missing something here: why does ieeefp.h declare those
functions, and where/when is ieeefp.h supposed to be used?

> Perhaps it would be better to protect them with #ifdef isnan/#endif,
> etc. sections?

Isn't the following trick enough to solve the problem?

  extern int (isnan)(double);

That is, surround the function's name with parens.