On Fri, 26 Jul 2013 10:43:07 +0100 David Chisnall wrote: > On 25 Jul 2013, at 19:19, Tijl Coosemans <t...@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
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