[Bug libstdc++/54847] --enable-libstdcxx-time=yes doesn't find the function nanosleep() on darwin

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847

--- Comment #38 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-10-08 17:03:39 UTC ---
I assume the option of using...

Index: libstdc++-v3/config/os/bsd/darwin/os_defines.h
===================================================================
--- libstdc++-v3/config/os/bsd/darwin/os_defines.h    (revision 192213)
+++ libstdc++-v3/config/os/bsd/darwin/os_defines.h    (working copy)
@@ -42,4 +42,8 @@
 // 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 C++11 standard.
+#define _GLIBCXX_USE_NANOSLEEP 1
+#define _GLIBCXX_USE_SCHED_YIELD 1
+
 #endif

...eliminates our ability to toggle this support off with
--disable-libstdcxx-time, right? This is my only concern with this approach
versus the patch in comment 32;