Date: Fri, 26 Jul 2013 12:26:54 +0200 From: Tijl Coosemans <tijl@coosemans.org> To: David Chisnall <theraven@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r253563 - head/contrib/libstdc++/include/c_std Message-ID: <20130726122654.19448832@kalimero.tijl.coosemans.org> In-Reply-To: <7D9DA326-0F32-44D2-92F9-EED0751F9AE0@FreeBSD.org> References: <201307231023.r6NANhGf065713@svn.freebsd.org> <20130725201948.2f5ae808@kalimero.tijl.coosemans.org> <7D9DA326-0F32-44D2-92F9-EED0751F9AE0@FreeBSD.org>
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On Fri, 26 Jul 2013 10:43:07 +0100 David Chisnall wrote:
> On 25 Jul 2013, at 19:19, Tijl Coosemans <tijl@coosemans.org> wrote:
>> This also
>> broke compilation of C code with -D_XOPEN_SOURCE=3D500.
>=20
> Do you have a test case for this?
% cc -c test.c -D_XOPEN_SOURCE=3D500 -Wall -std=3Dgnu89
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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