From a9f1407d844cf0783c3a2c4c1e227391ec9057ab Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Sat, 25 Nov 2023 15:38:02 +0300
Subject: [PATCH] Added a sanity check to prevent duplicate definition of
 BOOST_CORE_HAS_BUILTIN_BIT_CAST.

---
 include/boost/core/bit.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/core/bit.hpp b/include/boost/core/bit.hpp
index 67f7c98..5d24045 100644
--- a/include/boost/core/bit.hpp
+++ b/include/boost/core/bit.hpp
@@ -52,7 +52,7 @@
 # endif
 #endif
 
-#if defined(BOOST_MSVC) && BOOST_MSVC >= 1926
+#if !defined(BOOST_CORE_HAS_BUILTIN_BIT_CAST) && (defined(BOOST_MSVC) && BOOST_MSVC >= 1926)
 #  define BOOST_CORE_HAS_BUILTIN_BIT_CAST
 #endif