From 8f1243da406aebf5a8cebda65ea84e5dbeeff286 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@gmail.com>
Date: Thu, 29 Sep 2022 17:51:05 -0700
Subject: [PATCH] epicsSingleton: eliminate global ctor with >= c++11

---
 modules/libcom/src/cxxTemplates/epicsSingleton.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/modules/libcom/src/cxxTemplates/epicsSingleton.h b/modules/libcom/src/cxxTemplates/epicsSingleton.h
index 074ca16fb..21f15c37e 100644
--- a/modules/libcom/src/cxxTemplates/epicsSingleton.h
+++ b/modules/libcom/src/cxxTemplates/epicsSingleton.h
@@ -23,6 +23,9 @@
 
 class SingletonUntyped {
 public:
+#if __cplusplus>=201103L
+    constexpr
+#endif
     SingletonUntyped () :_pInstance ( 0 ), _refCount ( 0 ) {}
 #   if 0
     ~SingletonUntyped () {
@@ -112,6 +115,9 @@ public:
         epicsSingleton * _pSingleton;
     };
     friend class reference;
+#if __cplusplus>=201103L
+    constexpr
+#endif
     epicsSingleton () {}
     // mutex lock/unlock pair overhead incurred
     // when either of these are called