From 578da317020e267021776568f19e850cdd111ce3 Mon Sep 17 00:00:00 2001
From: Dane Springmeyer <dane@mapbox.com>
Date: Fri, 8 Aug 2014 14:16:49 -0700
Subject: [PATCH] use extern template to fix osx -flto bug - closes #2339

---
 include/mapnik/datasource_cache.hpp | 3 +++
 src/datasource_cache.cpp            | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/include/mapnik/datasource_cache.hpp b/include/mapnik/datasource_cache.hpp
index 556097a16..6646888bd 100644
--- a/include/mapnik/datasource_cache.hpp
+++ b/include/mapnik/datasource_cache.hpp
@@ -58,6 +58,9 @@ private:
     bool registered_;
     std::set<std::string> plugin_directories_;
 };
+
+extern template class singleton<datasource_cache, CreateStatic>;
+
 }
 
 #endif // MAPNIK_DATASOURCE_CACHE_HPP
diff --git a/src/datasource_cache.cpp b/src/datasource_cache.cpp
index 08af17caa..152107ba1 100644
--- a/src/datasource_cache.cpp
+++ b/src/datasource_cache.cpp
@@ -42,6 +42,8 @@
 
 namespace mapnik {
 
+template class singleton<datasource_cache, CreateStatic>;
+
 extern datasource_ptr create_static_datasource(parameters const& params);
 extern std::vector<std::string> get_static_datasource_names();