From 956ae917cd78217d650aa89c3b10deff1569eb88 Mon Sep 17 00:00:00 2001
From: Fred Suter <suterf@ornl.gov>
Date: Tue, 23 May 2023 03:56:02 -0400
Subject: [PATCH] try to solve the -Wundefined-var-template thing with clang

---
 src/s4u/s4u_Activity.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/s4u/s4u_Activity.cpp b/src/s4u/s4u_Activity.cpp
index 159ac3ece0..d9c236accd 100644
--- a/src/s4u/s4u_Activity.cpp
+++ b/src/s4u/s4u_Activity.cpp
@@ -27,7 +27,7 @@ namespace s4u {
 xbt::signal<void(Activity&)> Activity::on_veto;
 xbt::signal<void(Activity const&)> Activity::on_suspended;
 xbt::signal<void(Activity const&)> Activity::on_resumed;
-template<class AnyActivity> xbt::signal<void(AnyActivity const&)> Activity_T<AnyActivity>::on_completion;
+template<class AnyActivity> extern xbt::signal<void(AnyActivity const&)> Activity_T<AnyActivity>::on_completion;
 
 std::set<Activity*>* Activity::vetoed_activities_ = nullptr;
 
-- 
2.20.1