From 04cc766db315c9b573fa96aaa214c8acd8a16d64 Mon Sep 17 00:00:00 2001
From: Glen Fernandes <glen.fernandes@gmail.com>
Date: Thu, 11 Apr 2024 00:52:26 -0400
Subject: [PATCH] Address C++17 redeclaration of constexpr static

---
 include/boost/core/span.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/core/span.hpp b/include/boost/core/span.hpp
index 99a2dd7f..2e64262d 100644
--- a/include/boost/core/span.hpp
+++ b/include/boost/core/span.hpp
@@ -351,8 +351,10 @@ class span {
     detail::span_store<T, E> s_;
 };
 
+#if defined(BOOST_NO_CXX17_INLINE_VARIABLES)
 template<class T, std::size_t E>
 constexpr std::size_t span<T, E>::extent;
+#endif
 
 #ifdef __cpp_deduction_guides
 template<class I, class L>