On Fri, 26 Jul 2013 11:51:43 +0100 David Chisnall wrote: > 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?
Is it possible to put them back where they were but behind #if __cplusplus < 201103L ? That would be the least disruptive.
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