svn commit: r253563 - head/contrib/libstdc++/include/c_std
jilles at stack.nl
Fri Jul 26 14:04:45 UTC 2013
On Fri, Jul 26, 2013 at 11:51:43AM +0100, David Chisnall wrote:
> 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 >=
This is cosmetic, but
that isnan() appeared in Issue 3. This is before _XOPEN_SOURCE == 500. A
simple solution is to expose it when __XSI_VISIBLE > 0 && __XSI_VISIBLE
< 600 && __ISO_C_VISIBLE < 1999. However, <sys/cdefs.h> has no support
for _XOPEN_SOURCE < 500 and there is no point in adding such support
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