From 0562bcb418d8e1af7e181264bb763a071854f7e1 Mon Sep 17 00:00:00 2001
From: Bruno de Oliveira Abinader <bruno@mapbox.com>
Date: Tue, 21 Feb 2017 16:30:10 +0200
Subject: [PATCH] [core] Use std::call_once to report about missing VAOs

---
 src/mbgl/gl/segment.hpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/mbgl/gl/segment.hpp b/src/mbgl/gl/segment.hpp
index b2761a210..bd4926476 100644
--- a/src/mbgl/gl/segment.hpp
+++ b/src/mbgl/gl/segment.hpp
@@ -5,6 +5,7 @@
 #include <mbgl/util/optional.hpp>
 #include <mbgl/util/logging.hpp>
 
+#include <mutex>
 #include <cstddef>
 #include <vector>
 
@@ -46,11 +47,10 @@ public:
             }
         } else {
             // No VAO support. Force attributes to be rebound.
-            static bool reported = false;
-            if (!reported) {
+            static std::once_flag reportedOnce;
+            std::call_once(reportedOnce, [] {
                 Log::Warning(Event::OpenGL, "Not using Vertex Array Objects");
-                reported = true;
-            }
+            });
             context.elementBuffer = indexBuffer_;
             variableBindings = {};
         }