work-around for missing long double const expressions on GCC/PPC

gistfile1.txt

From: Iain Sandoe <iain@codesourcery.com>
Date: Sat, 11 Apr 2015 19:58:48 +0100
Subject: [PATCH] Fix up thread constexpr for GCC where the PPC port can't do
 long long constexpr.

---
 libcxx/include/thread | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libcxx/include/thread b/libcxx/include/thread
index 022021c..7a4d692 100644
--- a/libcxx/include/thread
+++ b/libcxx/include/thread
@@ -443,7 +443,13 @@ sleep_for(const chrono::duration<_Rep, _Period>& __d)
     using namespace chrono;
     if (__d > duration<_Rep, _Period>::zero())
     {
+#if ! defined (__clang__) && __APPLE__ && (__ppc__ || __ppc64__)
+        // We can't test for __GNUC__ since clang also defines that.
+        _LIBCPP_CONSTEXPR duration<long double> _Max = duration<long double>(ULLONG_MAX/1000000000ULL) ;
+         //nanoseconds::max(); .. long double const folding is broken :(
+#else
         _LIBCPP_CONSTEXPR duration<long double> _Max = nanoseconds::max();
+#endif
         nanoseconds __ns;
         if (__d < _Max)
         {
-- 
2.8.1