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From: David Chisnall <theraven@FreeBSD.org>
Date: Mon, 29 Jul 2013 08:32:14 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r253764 - head/lib/msun/src
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Author: theraven
Date: Mon Jul 29 08:32:13 2013
New Revision: 253764
URL: http://svnweb.freebsd.org/changeset/base/253764

Log:
  Reenable the isnan(double) / isinf(double) declarations when targeting C89 + SUSv2 mode.

Modified:
  head/lib/msun/src/math.h

Modified: head/lib/msun/src/math.h
==============================================================================
--- head/lib/msun/src/math.h	Mon Jul 29 08:08:43 2013	(r253763)
+++ head/lib/msun/src/math.h	Mon Jul 29 08:32:13 2013	(r253764)
@@ -209,6 +209,21 @@ __inline_isnanl(__const long double __x)
 	return (__x != __x);
 }
 
+/*
+ * Version 2 of the Single UNIX Specification (UNIX98) defined isnan() and
+ * isinf() as functions taking double.  C99, and the subsequent POSIX revisions
+ * (SUSv3, POSIX.1-2001, define it as a macro that accepts any real floating
+ * point type.  If we are targeting SUSv2 and C99 or C11 (or C++11) then we
+ * expose the newer definition, assuming that the language spec takes
+ * precedence over the operating system interface spec.
+ */
+#if	__XSI_VISIBLE > 0 && __XSI_VISIBLE < 600 && __ISO_C_VISIBLE < 1999
+#undef isinf
+#undef isnan
+int	isinf(double);
+int	isnan(double);
+#endif
+
 double	acos(double);
 double	asin(double);
 double	atan(double);