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