diff --git a/src/libCom/osi/compiler/clang/epicsAtomicCD.h b/src/libCom/osi/compiler/clang/epicsAtomicCD.h
index 34037869b..763cb0537 100644
--- a/src/libCom/osi/compiler/clang/epicsAtomicCD.h
+++ b/src/libCom/osi/compiler/clang/epicsAtomicCD.h
@@ -16,6 +16,8 @@
 #ifndef epicsAtomicCD_h
 #define epicsAtomicCD_h
 
+#define EPICS_ATOMIC_CMPLR_NAME "CLANG"
+
 #include "epicsAtomicOSD.h"
 
 #endif /* epicsAtomicCD_h */
diff --git a/src/libCom/osi/compiler/default/epicsAtomicCD.h b/src/libCom/osi/compiler/default/epicsAtomicCD.h
index 34037869b..585a39c97 100644
--- a/src/libCom/osi/compiler/default/epicsAtomicCD.h
+++ b/src/libCom/osi/compiler/default/epicsAtomicCD.h
@@ -16,6 +16,8 @@
 #ifndef epicsAtomicCD_h
 #define epicsAtomicCD_h
 
+#define EPICS_ATOMIC_CMPLR_NAME "DEFAULT"
+
 #include "epicsAtomicOSD.h"
 
 #endif /* epicsAtomicCD_h */
diff --git a/src/libCom/osi/compiler/gcc/epicsAtomicCD.h b/src/libCom/osi/compiler/gcc/epicsAtomicCD.h
index 8f7f97d16..15b9a6c9a 100644
--- a/src/libCom/osi/compiler/gcc/epicsAtomicCD.h
+++ b/src/libCom/osi/compiler/gcc/epicsAtomicCD.h
@@ -20,6 +20,8 @@
 #   error this header is only for use with the gnu compiler
 #endif
 
+#define EPICS_ATOMIC_CMPLR_NAME "GCC"
+
 #define GCC_ATOMIC_CONCAT( A, B ) GCC_ATOMIC_CONCATR(A,B)
 #define GCC_ATOMIC_CONCATR( A, B ) ( A ## B )
 
diff --git a/src/libCom/osi/compiler/msvc/epicsAtomicCD.h b/src/libCom/osi/compiler/msvc/epicsAtomicCD.h
index 282aa971a..e7d1c4b77 100644
--- a/src/libCom/osi/compiler/msvc/epicsAtomicCD.h
+++ b/src/libCom/osi/compiler/msvc/epicsAtomicCD.h
@@ -24,6 +24,8 @@
 
 #ifdef _MSC_EXTENSIONS
 
+#define EPICS_ATOMIC_CMPLR_NAME "MSVC-INTRINSIC"
+
 #include <intrin.h>
 
 #if defined ( _M_IX86 )
@@ -102,6 +104,8 @@ EPICS_ATOMIC_INLINE void epicsAtomicWriteMemoryBarrier (void)
 
 #else /* ifdef _MSC_EXTENSIONS */
 
+#define EPICS_ATOMIC_CMPLR_NAME "MSVC-DIRECT"
+
 /* 
  * if unavailable as an intrinsic we will try
  * for os specific inline solution
diff --git a/src/libCom/osi/compiler/solStudio/epicsAtomicCD.h b/src/libCom/osi/compiler/solStudio/epicsAtomicCD.h
index 34037869b..8a733a558 100644
--- a/src/libCom/osi/compiler/solStudio/epicsAtomicCD.h
+++ b/src/libCom/osi/compiler/solStudio/epicsAtomicCD.h
@@ -16,6 +16,8 @@
 #ifndef epicsAtomicCD_h
 #define epicsAtomicCD_h
 
+#define EPICS_ATOMIC_CMPLR_NAME "SOLSTUDIO"
+
 #include "epicsAtomicOSD.h"
 
 #endif /* epicsAtomicCD_h */
diff --git a/src/libCom/osi/os/WIN32/epicsAtomicOSD.h b/src/libCom/osi/os/WIN32/epicsAtomicOSD.h
index da5e49c86..2170fceff 100644
--- a/src/libCom/osi/os/WIN32/epicsAtomicOSD.h
+++ b/src/libCom/osi/os/WIN32/epicsAtomicOSD.h
@@ -16,6 +16,8 @@
 #ifndef epicsAtomicOSD_h
 #define epicsAtomicOSD_h
 
+#define EPICS_ATOMIC_OS_NAME "WIN32"
+
 #ifdef VC_EXTRALEAN
 #   define VC_EXTRALEAN_DETECTED_epicsAtomicOSD_h
 #else
diff --git a/src/libCom/osi/os/posix/epicsAtomicOSD.h b/src/libCom/osi/os/posix/epicsAtomicOSD.h
index fdc38dfe2..9dad0e204 100644
--- a/src/libCom/osi/os/posix/epicsAtomicOSD.h
+++ b/src/libCom/osi/os/posix/epicsAtomicOSD.h
@@ -18,6 +18,8 @@
 
 #include <shareLib.h>
 
+#define EPICS_ATOMIC_OS_NAME "POSIX"
+
 typedef struct EpicsAtomicLockKey {} EpicsAtomicLockKey;
 
 #ifdef __cplusplus
diff --git a/src/libCom/osi/os/solaris/epicsAtomicOSD.h b/src/libCom/osi/os/solaris/epicsAtomicOSD.h
index 14a5f1502..1fa23bd88 100644
--- a/src/libCom/osi/os/solaris/epicsAtomicOSD.h
+++ b/src/libCom/osi/os/solaris/epicsAtomicOSD.h
@@ -18,6 +18,8 @@
 #ifndef epicsAtomicOSD_h
 #define epicsAtomicOSD_h
 
+#define EPICS_ATOMIC_OS_NAME "Solaris"
+
 #if defined ( __SunOS_5_10 )
 
 /* 
diff --git a/src/libCom/osi/os/vxWorks/epicsAtomicOSD.h b/src/libCom/osi/os/vxWorks/epicsAtomicOSD.h
index 32a7d5a10..e7bdde0c3 100644
--- a/src/libCom/osi/os/vxWorks/epicsAtomicOSD.h
+++ b/src/libCom/osi/os/vxWorks/epicsAtomicOSD.h
@@ -32,6 +32,8 @@
 #include <limits.h>
 #include <vxAtomicLib.h>
 
+#define EPICS_ATOMIC_OS_NAME "VX-ATOMICLIB"
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
@@ -206,6 +208,8 @@ EPICS_ATOMIC_INLINE int epicsAtomicCmpAndSwapIntT ( int * pTarget,
 #include "vxLib.h"
 #include "intLib.h"
 
+#define EPICS_ATOMIC_OS_NAME "VX-INTLIB"
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
diff --git a/src/libCom/test/epicsAtomicTest.cpp b/src/libCom/test/epicsAtomicTest.cpp
index 78cfa5b95..21d56eec7 100644
--- a/src/libCom/test/epicsAtomicTest.cpp
+++ b/src/libCom/test/epicsAtomicTest.cpp
@@ -248,11 +248,89 @@ template void testCAS < EpicsAtomicPtrT > (void);
 #   pragma warning ( pop )
 #endif
 
+static void testClassify()
+{
+    testDiag("Classify Build conditions");
+#ifdef EPICS_ATOMIC_CMPLR_NAME
+    testDiag("Compiler dependent impl name %s", EPICS_ATOMIC_CMPLR_NAME);
+#else
+    testDiag("Compiler dependent impl name undefined");
+#endif
+#ifdef EPICS_ATOMIC_CMPLR_NAME
+    testDiag("OS dependent impl name %s", EPICS_ATOMIC_OS_NAME);
+#else
+    testDiag("OS dependent impl name undefined");
+#endif
+
+#ifdef __GNUC__
+#if GCC_ATOMIC_INTRINSICS_GCC4_OR_BETTER
+    testDiag("GCC using atomic builtin memory barrier");
+#else
+    testDiag("GCC using asm memory barrier");
+#endif
+#if GCC_ATOMIC_INTRINSICS_AVAIL_INT_T || GCC_ATOMIC_INTRINSICS_AVAIL_EARLIER
+    testDiag("GCC use builtin for int");
+#endif
+#if GCC_ATOMIC_INTRINSICS_AVAIL_SIZE_T || GCC_ATOMIC_INTRINSICS_AVAIL_EARLIER
+    testDiag("GCC use builtin for size_t");
+#endif
+
+#ifndef EPICS_ATOMIC_INCR_INTT
+    testDiag("Use default epicsAtomicIncrIntT()");
+#endif
+#ifndef EPICS_ATOMIC_INCR_SIZET
+    testDiag("Use default epicsAtomicIncrSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_DECR_INTT
+    testDiag("Use default epicsAtomicDecrIntT()");
+#endif
+#ifndef EPICS_ATOMIC_DECR_SIZET
+    testDiag("Use default epicsAtomicDecrSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_ADD_INTT
+    testDiag("Use default epicsAtomicAddIntT()");
+#endif
+#ifndef EPICS_ATOMIC_ADD_SIZET
+    testDiag("Use default epicsAtomicAddSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_SUB_SIZET
+    testDiag("Use default epicsAtomicSubSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_SET_INTT
+    testDiag("Use default epicsAtomicSetIntT()");
+#endif
+#ifndef EPICS_ATOMIC_SET_SIZET
+    testDiag("Use default epicsAtomicSetSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_SET_PTRT
+    testDiag("Use default epicsAtomicSetPtrT()");
+#endif
+#ifndef EPICS_ATOMIC_GET_INTT
+    testDiag("Use default epicsAtomicGetIntT()");
+#endif
+#ifndef EPICS_ATOMIC_GET_SIZET
+    testDiag("Use default epicsAtomicGetSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_GET_PTRT
+    testDiag("Use default epicsAtomicGetPtrT()");
+#endif
+#ifndef EPICS_ATOMIC_CAS_INTT
+    testDiag("Use default epicsAtomicCmpAndSwapIntT()");
+#endif
+#ifndef EPICS_ATOMIC_CAS_SIZET
+    testDiag("Use default epicsAtomicCmpAndSwapSizeT()");
+#endif
+#ifndef EPICS_ATOMIC_CAS_PTRT
+    testDiag("Use default epicsAtomicCmpAndSwapPtrT()");
+#endif
+#endif /* __GNUC__ */
+}
 
 MAIN ( epicsAtomicTest )
 {
 
     testPlan ( 31 );
+    testClassify ();
 
     testIncrDecr < int > ();
     testIncrDecr < size_t > ();