diff --git a/include/boost/smart_ptr/detail/atomic_count_gcc.hpp b/include/boost/smart_ptr/detail/atomic_count_gcc.hpp
index df7e323..f8b5621 100644
--- a/include/boost/smart_ptr/detail/atomic_count_gcc.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_gcc.hpp
@@ -23,6 +23,13 @@
 # include <bits/atomicity.h>
 #endif
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using libstdc++ atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp b/include/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp
index 5c44d7c..100c9cf 100644
--- a/include/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_gcc_x86.hpp
@@ -13,6 +13,13 @@
 //  http://www.boost.org/LICENSE_1_0.txt)
 //
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/x86 atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_nt.hpp b/include/boost/smart_ptr/detail/atomic_count_nt.hpp
index 3bbf138..63b848f 100644
--- a/include/boost/smart_ptr/detail/atomic_count_nt.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_nt.hpp
@@ -15,6 +15,13 @@
 //  http://www.boost.org/LICENSE_1_0.txt
 //
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_pt.hpp b/include/boost/smart_ptr/detail/atomic_count_pt.hpp
index f99b910..69a494d 100644
--- a/include/boost/smart_ptr/detail/atomic_count_pt.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_pt.hpp
@@ -14,6 +14,13 @@
 #include <boost/assert.hpp>
 #include <pthread.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using pthread_mutex atomic_count")
+
+#endif
+
 //
 //  The generic pthread_mutex-based implementation sometimes leads to
 //    inefficiencies. Example: a class with two atomic_count members
diff --git a/include/boost/smart_ptr/detail/atomic_count_solaris.hpp b/include/boost/smart_ptr/detail/atomic_count_solaris.hpp
index a13bcfb..fb80d0a 100644
--- a/include/boost/smart_ptr/detail/atomic_count_solaris.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_solaris.hpp
@@ -15,6 +15,13 @@
 
 #include <atomic.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Solaris atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_spin.hpp b/include/boost/smart_ptr/detail/atomic_count_spin.hpp
index 8e62349..66332e9 100644
--- a/include/boost/smart_ptr/detail/atomic_count_spin.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_spin.hpp
@@ -13,6 +13,13 @@
 
 #include <boost/smart_ptr/detail/spinlock_pool.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using spinlock-based atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_std_atomic.hpp b/include/boost/smart_ptr/detail/atomic_count_std_atomic.hpp
index 3d5fb78..360d26a 100644
--- a/include/boost/smart_ptr/detail/atomic_count_std_atomic.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_std_atomic.hpp
@@ -16,6 +16,13 @@
 #include <atomic>
 #include <cstdint>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_sync.hpp b/include/boost/smart_ptr/detail/atomic_count_sync.hpp
index b6359b5..81d7d65 100644
--- a/include/boost/smart_ptr/detail/atomic_count_sync.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_sync.hpp
@@ -19,6 +19,13 @@
 # include <ia64intrin.h>
 #endif
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using __sync atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/atomic_count_win32.hpp b/include/boost/smart_ptr/detail/atomic_count_win32.hpp
index 633e73c..664d760 100644
--- a/include/boost/smart_ptr/detail/atomic_count_win32.hpp
+++ b/include/boost/smart_ptr/detail/atomic_count_win32.hpp
@@ -19,6 +19,13 @@
 
 #include <boost/smart_ptr/detail/sp_interlocked.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Win32 atomic_count")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_acc_ia64.hpp b/include/boost/smart_ptr/detail/sp_counted_base_acc_ia64.hpp
index 07c07e2..b31997d 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_acc_ia64.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_acc_ia64.hpp
@@ -19,6 +19,13 @@
 #include <boost/config.hpp>
 #include <machine/sys/inline.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using HP aCC++/HP-UX/IA64 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_aix.hpp b/include/boost/smart_ptr/detail/sp_counted_base_aix.hpp
index 072c667..65dc11f 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_aix.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_aix.hpp
@@ -25,6 +25,13 @@
 #include <builtins.h>
 #include <sys/atomic_op.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using AIX sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_clang.hpp b/include/boost/smart_ptr/detail/sp_counted_base_clang.hpp
index 2c3938f..3a2ab0e 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_clang.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_clang.hpp
@@ -20,6 +20,13 @@
 #include <boost/config.hpp>
 #include <boost/cstdint.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Clang/C11 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp b/include/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
index 8e5a414..f9df68a 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp
@@ -27,6 +27,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using CodeWarrior/PowerPC sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_cw_x86.hpp b/include/boost/smart_ptr/detail/sp_counted_base_cw_x86.hpp
index 1ab21a5..297f055 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_cw_x86.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_cw_x86.hpp
@@ -28,6 +28,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using CodeWarrior/x86 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_gcc_ia64.hpp b/include/boost/smart_ptr/detail/sp_counted_base_gcc_ia64.hpp
index 73d4533..0c8d172 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_gcc_ia64.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_gcc_ia64.hpp
@@ -19,6 +19,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/IA64 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp b/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp
index f109f65..5cc5de9 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp
@@ -23,6 +23,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/MIPS sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp b/include/boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp
index 5dce1cf..c5f84f5 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp
@@ -27,6 +27,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/PowerPC sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp b/include/boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp
index a3d7295..8062487 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_gcc_sparc.hpp
@@ -23,6 +23,13 @@
 #include <boost/config.hpp>
 #include <inttypes.h> // int32_t
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/Sparc sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp b/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp
index ebbea50..1c55918 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp
@@ -27,6 +27,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/x86 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp b/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp
index 0830050..eb37a79 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp
@@ -23,6 +23,13 @@
 #include <boost/config.hpp>
 #include <boost/cstdint.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_pt.hpp b/include/boost/smart_ptr/detail/sp_counted_base_pt.hpp
index ec850fe..b296e2d 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_pt.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_pt.hpp
@@ -24,6 +24,13 @@
 #include <boost/cstdint.hpp>
 #include <pthread.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using pthread_mutex sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_snc_ps3.hpp b/include/boost/smart_ptr/detail/sp_counted_base_snc_ps3.hpp
index f38eee6..d60dd75 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_snc_ps3.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_snc_ps3.hpp
@@ -6,7 +6,7 @@
 # pragma once
 #endif
 
-//  detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+
+//  detail/sp_counted_base_gcc_snc_ps3.hpp - PS3 Cell
 //
 //  Copyright (c) 2006 Piotr Wyderski
 //  Copyright (c) 2006 Tomas Puverle
@@ -23,6 +23,13 @@
 #include <boost/config.hpp>
 #include <inttypes.h> // uint32_t
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using PS3 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_solaris.hpp b/include/boost/smart_ptr/detail/sp_counted_base_solaris.hpp
index 29f6b8a..4ad6b5e 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_solaris.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_solaris.hpp
@@ -24,6 +24,13 @@
 #include <boost/config.hpp>
 #include <atomic.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Solaris sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_spin.hpp b/include/boost/smart_ptr/detail/sp_counted_base_spin.hpp
index 56911bd..4412cee 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_spin.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_spin.hpp
@@ -22,6 +22,13 @@
 #include <boost/smart_ptr/detail/spinlock_pool.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using spinlock-based sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp b/include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp
index 338eeea..52acf92 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp
@@ -21,6 +21,13 @@
 #include <atomic>
 #include <cstdint>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_sync.hpp b/include/boost/smart_ptr/detail/sp_counted_base_sync.hpp
index 8446560..111410e 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_sync.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_sync.hpp
@@ -23,6 +23,13 @@
 # include <ia64intrin.h>
 #endif
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using __sync sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp b/include/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp
index 2467e95..e08536d 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_vacpp_ppc.hpp
@@ -24,6 +24,13 @@
 #include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using xlC/PowerPC sp_counted_base")
+
+#endif
+
 extern "builtin" void __lwsync(void);
 extern "builtin" void __isync(void);
 extern "builtin" int __fetch_and_add(volatile int* addr, int val);
diff --git a/include/boost/smart_ptr/detail/sp_counted_base_w32.hpp b/include/boost/smart_ptr/detail/sp_counted_base_w32.hpp
index 15853f9..dc0df4a 100644
--- a/include/boost/smart_ptr/detail/sp_counted_base_w32.hpp
+++ b/include/boost/smart_ptr/detail/sp_counted_base_w32.hpp
@@ -29,6 +29,13 @@
 #include <boost/config/workaround.hpp>
 #include <boost/config.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Win32 sp_counted_base")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/spinlock_gcc_arm.hpp b/include/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
index 24d08a8..e618f6e 100644
--- a/include/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_gcc_arm.hpp
@@ -11,6 +11,13 @@
 
 #include <boost/smart_ptr/detail/yield_k.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using g++/ARM spinlock")
+
+#endif
+
 #if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || defined(__ARM_ARCH_7EM__) || defined(__ARM_ARCH_7S__)
 
 # define BOOST_SP_ARM_BARRIER "dmb"
diff --git a/include/boost/smart_ptr/detail/spinlock_nt.hpp b/include/boost/smart_ptr/detail/spinlock_nt.hpp
index 1f399d0..ce23761 100644
--- a/include/boost/smart_ptr/detail/spinlock_nt.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_nt.hpp
@@ -17,6 +17,13 @@
 
 #include <boost/assert.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded spinlock emulation")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/spinlock_pt.hpp b/include/boost/smart_ptr/detail/spinlock_pt.hpp
index f9cabfc..a7f8a81 100644
--- a/include/boost/smart_ptr/detail/spinlock_pt.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_pt.hpp
@@ -17,6 +17,13 @@
 
 #include <pthread.h>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using pthread_mutex spinlock emulation")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/spinlock_std_atomic.hpp b/include/boost/smart_ptr/detail/spinlock_std_atomic.hpp
index b1d1eea..458370c 100644
--- a/include/boost/smart_ptr/detail/spinlock_std_atomic.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_std_atomic.hpp
@@ -19,6 +19,13 @@
 #include <boost/config.hpp>
 #include <atomic>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using std::atomic spinlock")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/spinlock_sync.hpp b/include/boost/smart_ptr/detail/spinlock_sync.hpp
index a7145c5..854cc7e 100644
--- a/include/boost/smart_ptr/detail/spinlock_sync.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_sync.hpp
@@ -21,6 +21,13 @@
 # include <ia64intrin.h>
 #endif
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using __sync spinlock")
+
+#endif
+
 namespace boost
 {
 
diff --git a/include/boost/smart_ptr/detail/spinlock_w32.hpp b/include/boost/smart_ptr/detail/spinlock_w32.hpp
index d34e4fc..39092ce 100644
--- a/include/boost/smart_ptr/detail/spinlock_w32.hpp
+++ b/include/boost/smart_ptr/detail/spinlock_w32.hpp
@@ -18,6 +18,13 @@
 #include <boost/smart_ptr/detail/sp_interlocked.hpp>
 #include <boost/smart_ptr/detail/yield_k.hpp>
 
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using Win32 spinlock")
+
+#endif
+
 // BOOST_COMPILER_FENCE
 
 #if defined(__INTEL_COMPILER)
diff --git a/test/Jamfile b/test/Jamfile
index 1dde2c0..3619273 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -397,3 +397,4 @@ run shared_ptr_mt_test.cpp
 run weak_ptr_mt_test.cpp
   : : : <threading>multi ;
 
+compile sp_report_implementation.cpp ;
diff --git a/test/sp_report_implementation.cpp b/test/sp_report_implementation.cpp
new file mode 100644
index 0000000..be0cccf
--- /dev/null
+++ b/test/sp_report_implementation.cpp
@@ -0,0 +1,12 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#define BOOST_SP_REPORT_IMPLEMENTATION
+#include <boost/shared_ptr.hpp>
+#include <boost/smart_ptr/detail/spinlock.hpp>
+#include <boost/smart_ptr/detail/atomic_count.hpp>
+
+int main()
+{
+}