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Message-ID: <44033332.7020801@redhat.com>
Date: Mon, 27 Feb 2006 12:13:22 -0500
From: Jeff Johnston <jjohnstn AT redhat DOT com>
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To: Gabriel Dos Reis <gdr AT integrable-solutions DOT net>
Cc: Dave Korn <dave DOT korn AT artimi DOT com>, cygwin AT cygwin DOT com, libstdc++@gcc.gnu.org,
   newlib AT sources DOT redhat DOT com
Subject: Re: gcc-3.4.4-1: c++: cmath: calling std::isnan results in endless  loop
References: <01d101c63bb9$ef9ead20$a501a8c0 AT CAM DOT ARTIMI DOT COM> <m34q2kg2k3 DOT fsf AT uniton DOT integrable-solutions DOT net>
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Gabriel Dos Reis wrote:
> "Dave Korn" <dave DOT korn AT artimi DOT com> writes:
> 
> [...]
> 
> |   It looks to me like the cygwin/newlib combination is not being compliant if
> | it implements isnan as a function rather than a macro.  I couldn't see
> | anything in the standard that says it can be a function, and every reference
> | to it describes it as a macro, not a function.  It may be the case that
> | libstdc++ is within its rights to assume that isnan is a macro after all.
> 
> yes, isnan and friends are supposed to be macros only, not functions.
> 

I'll start working on a newlib patch for this.

> |   OTOH it may be that libstdc++ was only supposed to be shadowing those ctype
> | macros that are guaranteed to have underlying function implementations; I
> | don't know what the shadowing is for, so I can't comment.
> 
> libstdc++ is supposed to shadow ctype macros -- and it also expect
> them to have a function implementation.
> 
> -- Gaby


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