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To:	"Dave Korn" <dave DOT korn AT artimi DOT com>
Cc:	<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>
From:	Gabriel Dos Reis <gdr AT integrable-solutions DOT net>
In-Reply-To:	<01d101c63bb9$ef9ead20$a501a8c0@CAM.ARTIMI.COM>
Date:	27 Feb 2006 17:59:56 +0100
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"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.

|   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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