svn commit: r253563 - head/contrib/libstdc++/include/c_std

[David Chisnall]

On 26 Jul 2013, at 11:26, Tijl Coosemans <tijl at coosemans.org> wrote:

> On Fri, 26 Jul 2013 10:43:07 +0100 David Chisnall wrote:
>> On 25 Jul 2013, at 19:19, Tijl Coosemans <tijl at coosemans.org> wrote:
>>> This also
>>> broke compilation of C code with -D_XOPEN_SOURCE=500.
>> 
>> Do you have a test case for this?
> 
> % cc -c test.c -D_XOPEN_SOURCE=500 -Wall -std=gnu89
> test.c:5:10: warning: implicit declaration of function 'isnan'
>      [-Wimplicit-function-declaration]
>        return( isnan( d ));
>                ^
> 1 warning generated.
> 
> The isnan function is part of SUSv2:
> http://pubs.opengroup.org/onlinepubs/7990989775/xsh/isnan.html
> 
> _XOPEN_SOURCE is handled in sys/cdefs.h. It sets the following macros:
> #define __XSI_VISIBLE           500
> #define __POSIX_VISIBLE         199506
> #define __ISO_C_VISIBLE         1990

So, isnan and isinf should be visible in functions when in __ISO_C_VISIBLE < 1999 and __XSI_VISIBLE < 600, 
and __XSI_VISIBLE  >= 500?

David

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