diff --git a/include/boost/smart_ptr/detail/sp_has_gcc_intrinsics.hpp b/include/boost/smart_ptr/detail/sp_has_gcc_intrinsics.hpp
deleted file mode 100644
index cf2d897..0000000
--- a/include/boost/smart_ptr/detail/sp_has_gcc_intrinsics.hpp
+++ /dev/null
@@ -1,30 +0,0 @@
-#ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_GCC_INTRINSICS_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_HAS_GCC_INTRINSICS_HPP_INCLUDED
-
-// MS compatible compilers support #pragma once
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
-# pragma once
-#endif
-
-
-// boost/smart_ptr/detail/sp_has_gcc_intrinsics.hpp
-//
-// Copyright 2020 Peter Dimov
-// Distributed under the Boost Software License, Version 1.0.
-// https://www.boost.org/LICENSE_1_0.txt
-//
-// Defines the BOOST_SP_HAS_GCC_INTRINSICS macro if the __atomic_*
-// intrinsics are available.
-
-// Libraries (e.g. Kokkos) sometimes define the __ATOMIC_RELAXED macros,
-// leading to errors under MSVC (https://github.com/boostorg/smart_ptr/pull/112)
-
-#if defined( __ATOMIC_RELAXED ) && defined( __ATOMIC_ACQUIRE ) && defined( __ATOMIC_RELEASE ) && defined( __ATOMIC_ACQ_REL ) \
-    && !( defined(_MSC_VER) && !defined(__clang__) )
-
-# define BOOST_SP_HAS_GCC_INTRINSICS
-
-#endif
-
-#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_GCC_INTRINSICS_HPP_INCLUDED
diff --git a/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp b/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
deleted file mode 100644
index 875d869..0000000
--- a/include/boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
+++ /dev/null
@@ -1,69 +0,0 @@
-#ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED
-#define BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED
-
-// MS compatible compilers support #pragma once
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
-# pragma once
-#endif
-
-//
-//  boost/smart_ptr/detail/sp_has_sync_intrinsics.hpp
-//
-//  Copyright (c) 2008, 2009 Peter Dimov
-//
-//  Distributed under the Boost Software License, Version 1.0.
-//  See accompanying file LICENSE_1_0.txt or copy at
-//  http://www.boost.org/LICENSE_1_0.txt)
-//
-//  Defines the BOOST_SP_HAS_SYNC_INTRINSICS macro if the __sync_* intrinsics
-//  are available.
-//
-
-#if !defined( BOOST_SP_NO_SYNC_INTRINSICS ) && !defined( BOOST_SP_NO_SYNC )
-
-#if defined( __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 ) && !defined( __c2__ )
-
-# define BOOST_SP_HAS_SYNC_INTRINSICS
-
-#elif defined( __IBMCPP__ ) && ( __IBMCPP__ >= 1210 ) && !defined( __COMPILER_VER__ )
-
-# define BOOST_SP_HAS_SYNC_INTRINSICS
-
-#elif defined( __GNUC__ ) && ( __GNUC__ * 100 + __GNUC_MINOR__ >= 401 ) && !defined( __c2__ )
-
-#define BOOST_SP_HAS_SYNC_INTRINSICS
-
-#if defined( __arm__ )  || defined( __armel__ )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined( __hppa ) || defined( __hppa__ )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined( __m68k__ )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined( __sh__ )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined( __sparc__ )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined( __INTEL_COMPILER ) && !defined( __ia64__ ) && ( __INTEL_COMPILER < 1110 )
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#if defined(__PATHSCALE__) && ((__PATHCC__ == 4) && (__PATHCC_MINOR__ < 9)) 
-#undef BOOST_SP_HAS_SYNC_INTRINSICS
-#endif
-
-#endif
-
-#endif // #if !defined( BOOST_SP_NO_SYNC_INTRINSICS ) && !defined( BOOST_SP_NO_SYNC )
-
-#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_HAS_SYNC_INTRINSICS_HPP_INCLUDED