From d624265ef85692f738eb8df18ada4a6b4f8dc299 Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Thu, 15 Nov 2018 13:04:35 -0600
Subject: [PATCH] Make explicit template instantiation definition a declaration
 in filter.h

---
 include/openmc/tallies/filter.h | 2 +-
 src/tallies/filter.cpp          | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/openmc/tallies/filter.h b/include/openmc/tallies/filter.h
index 5590a07674..fd3be0aafe 100644
--- a/include/openmc/tallies/filter.h
+++ b/include/openmc/tallies/filter.h
@@ -29,7 +29,7 @@ public:
 // Without an explicit instantiation of vector<FilterMatch>, the Intel compiler
 // will complain about the threadprivate directive on filter_matches. Note that
 // this has to happen *outside* of the openmc namespace
-template class std::vector<openmc::FilterMatch>;
+extern template class std::vector<openmc::FilterMatch>;
 
 namespace openmc {
 
diff --git a/src/tallies/filter.cpp b/src/tallies/filter.cpp
index aa5d196072..7cf54165d9 100644
--- a/src/tallies/filter.cpp
+++ b/src/tallies/filter.cpp
@@ -26,6 +26,8 @@
 #include "openmc/tallies/filter_universe.h"
 #include "openmc/tallies/filter_zernike.h"
 
+// explicit template instantiation definition
+template class std::vector<openmc::FilterMatch>;
 
 namespace openmc {