From 0b6548a2820faaf6c59cda4fbc75ba81e1d6084a Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 11 Nov 2013 08:26:16 +0100
Subject: util/RefCount: no "constexpr" with libc++

Not supported by libc++.
---
 NEWS                  | 1 +
 src/util/RefCount.hxx | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index 895d00bf5..c4fa9b8b2 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,7 @@ ver 0.18.4 (not yet released)
 * decoder
   - dsdiff: fix byte order bug
 * fix build failures due to missing includes
+* libc++ compatibility
 
 ver 0.18.3 (2013/11/08)
 * fix stuck MPD after song change (0.18.2 regression)
diff --git a/src/util/RefCount.hxx b/src/util/RefCount.hxx
index 9a45a585b..dff850036 100644
--- a/src/util/RefCount.hxx
+++ b/src/util/RefCount.hxx
@@ -42,7 +42,12 @@ class RefCount {
 	std::atomic_uint n;
 
 public:
-	constexpr RefCount():n(1) {}
+#ifndef _LIBCPP_VERSION
+	/* the "constexpr" is missing in libc++'s "atomic"
+	   implementation */
+	constexpr
+#endif
+	RefCount():n(1) {}
 
 	void Increment() {
 		++n;
-- 
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