diff --git a/mozilla/xpcom/base/nsStackFrameUnix.cpp b/mozilla/xpcom/base/nsStackFrameUnix.cpp
index 5ce8111f33f..6899a44dbf0 100644
--- a/mozilla/xpcom/base/nsStackFrameUnix.cpp
+++ b/mozilla/xpcom/base/nsStackFrameUnix.cpp
@@ -83,25 +83,15 @@ void DemangleSymbol(const char * aSymbol,
 }
 
 
-#if defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC)) // i386 or PPC Linux stackwalking code
+#if defined(linux) && defined(__GNUC__) && (defined(__i386) || defined(PPC)) // i386 or PPC Linux stackwalking code
 
-#include <setjmp.h>
-//
 
 void DumpStackToFile(FILE* aStream)
 {
-  jmp_buf jb;
-  setjmp(jb);
-
   // Stack walking code courtesy Kipp's "leaky".
 
-  // Get the frame pointer out of the jmp_buf
-  void **bp = (void**)
-#if defined(__i386) 
-    (jb[0].__jmpbuf[JB_BP]);
-#elif defined(PPC)
-    (jb[0].__jmpbuf[JB_GPR1]);
-#endif
+  // Get the frame pointer
+  void **bp = (void**) __builtin_frame_address(0);
 
   int skip = 2;
   for ( ; (void**)*bp > bp; bp = (void**)*bp) {
diff --git a/mozilla/xpcom/base/nsTraceRefcntImpl.cpp b/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
index c86fb5f4f02..41011237f12 100644
--- a/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
+++ b/mozilla/xpcom/base/nsTraceRefcntImpl.cpp
@@ -50,19 +50,6 @@
 
 #if defined(_WIN32)
 #include <windows.h>
-#elif defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC))
-#include <setjmp.h>
-
-//
-// On glibc 2.1, the Dl_info api defined in <dlfcn.h> is only exposed
-// if __USE_GNU is defined.  I suppose its some kind of standards
-// adherence thing.
-//
-#if (__GLIBC_MINOR__ >= 1) && !defined(__USE_GNU)
-#define __USE_GNU
-#endif
-
-#include <dlfcn.h>
 #endif
 
 #ifdef HAVE_LIBDL
@@ -460,7 +447,7 @@ static PRIntn PR_CALLBACK DumpSerialNumbers(PLHashEntry* aHashEntry, PRIntn aInd
 
 #endif /* NS_BUILD_REFCNT_LOGGING */
 
-nsresult
+NS_COM nsresult
 nsTraceRefcntImpl::DumpStatistics(StatisticsType type, FILE* out)
 {
   nsresult rv = NS_OK;
@@ -537,7 +524,7 @@ done:
   return rv;
 }
 
-void
+NS_COM void
 nsTraceRefcntImpl::ResetStatistics()
 {
 #ifdef NS_BUILD_REFCNT_LOGGING
@@ -821,7 +808,7 @@ static void InitTraceLog(void)
 
 #if defined(_WIN32) && defined(_M_IX86) && !defined(WINCE) // WIN32 x86 stack walking code
 #include "nsStackFrameWin.h"
-void
+NS_COM void
 nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 {
   DumpStackToFile(aStream);
@@ -829,9 +816,9 @@ nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 
 // WIN32 x86 stack walking code
 // i386 or PPC Linux stackwalking code or Solaris
-#elif (defined(linux) && defined(__GLIBC__) && (defined(__i386) || defined(PPC))) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386)))
+#elif (defined(linux) && defined(__GNUC__) && (defined(__i386) || defined(PPC))) || (defined(__sun) && (defined(__sparc) || defined(sparc) || defined(__i386) || defined(i386)))
 #include "nsStackFrameUnix.h"
-void
+NS_COM void
 nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 {
   DumpStackToFile(aStream);
@@ -839,7 +826,7 @@ nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 
 #else // unsupported platform.
 
-void
+NS_COM void
 nsTraceRefcntImpl::WalkTheStack(FILE* aStream)
 {
 	fprintf(aStream, "write me, dammit!\n");