gcc-3.4.4-1: c++: cmath: calling std::isnan results in endless loop

[Jeff Johnston]

Gabriel Dos Reis wrote:
> "Dave Korn" <dave.korn@artimi.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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