From patchwork Tue Oct  9 00:39:21 2012
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Subject: revised fix for nanosleep check in GLIBCXX_ENABLE_LIBSTDCXX_TIME for
 darwin
From: Jack Howarth <howarth@bromo.med.uc.edu>
X-Patchwork-Id: 190167
Message-Id: <20121009003921.GA25678@bromo.med.uc.edu>
To: libstdc++@gcc.gnu.org
Cc: mikestump@comcast.net, iain@codesourcery.com, redi@gcc.gnu.org,
 paoauto-logoutoracle.com@bromo.med.uc.edu, gcc-patches@gcc.gnu.org
Date: Mon, 8 Oct 2012 20:39:21 -0400

The --enable-libstdcxx-time=yes configure option fails to validate the
presence of a usable nanosleep() call on darwin due to its use of pre-2008
POSIX timers. As both nanosleep() and sched_yield() have always been available
on darwin, the attached patch simply defines _GLIBCXX_USE_NANOSLEEP and
_GLIBCXX_USE_SCHED_YIELD in config/os/bsd/darwin/os_defines.h. This also has
the advantage of effectively making --enable-libstdcxx-time=yes the default
on darwin. Regression tested on x86_64-apple-darwin12.
   Okay for gcc trunk as well as gcc-4_7-branch/gcc-4_6-branch/gcc-4_5-branch?
                Jack

libstdc++-v3/

2012-10-08  Jack Howarth  <howarth@bromo.med.uc.edu>

	PR libstdc++/54847
	* config/os/bsd/darwin/os_defines.h (_GLIBCXX_USE_NANOSLEEP): Define.
	(_GLIBCXX_USE_SCHED_YIELD): Likewise.


Index: libstdc++-v3/config/os/bsd/darwin/os_defines.h
===================================================================
--- libstdc++-v3/config/os/bsd/darwin/os_defines.h	(revision 192222)
+++ libstdc++-v3/config/os/bsd/darwin/os_defines.h	(working copy)
@@ -42,4 +42,9 @@
 // Static initializer macro is buggy in darwin, see libstdc++/51906
 #define _GTHREAD_USE_RECURSIVE_MUTEX_INIT_FUNC
 
+// Use nanosleep and sched_yield in libc for time.clock and 
+// thread.thread.this in C++11 standard.
+#define _GLIBCXX_USE_NANOSLEEP 1
+#define _GLIBCXX_USE_SCHED_YIELD 1
+
 #endif