Index: lib/Support/PrettyStackTrace.cpp
===================================================================
--- lib/Support/PrettyStackTrace.cpp
+++ lib/Support/PrettyStackTrace.cpp
@@ -33,7 +33,7 @@
 // If backtrace support is not enabled, compile out support for pretty stack
 // traces.  This has the secondary effect of not requiring thread local storage
 // when backtrace support is disabled.
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
 
 // We need a thread local pointer to manage the stack of our stack trace
 // objects, but we *really* cannot tolerate destructors running and do not want
@@ -127,11 +127,11 @@
 #endif
 }
 
-// defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+// ENABLE_BACKTRACES
 #endif
 
 PrettyStackTraceEntry::PrettyStackTraceEntry() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   // Link ourselves.
   NextEntry = PrettyStackTraceHead;
   PrettyStackTraceHead = this;
@@ -139,7 +139,7 @@
 }
 
 PrettyStackTraceEntry::~PrettyStackTraceEntry() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   assert(PrettyStackTraceHead == this &&
          "Pretty stack trace entry destruction is out of order");
   PrettyStackTraceHead = NextEntry;
@@ -174,7 +174,7 @@
   OS << '\n';
 }
 
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
 static bool RegisterCrashPrinter() {
   sys::AddSignalHandler(CrashHandler, nullptr);
   return false;
@@ -182,7 +182,7 @@
 #endif
 
 void llvm::EnablePrettyStackTrace() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   // The first time this is called, we register the crash printer.
   static bool HandlerRegistered = RegisterCrashPrinter();
   (void)HandlerRegistered;
@@ -190,7 +190,7 @@
 }
 
 const void *llvm::SavePrettyStackState() {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   return PrettyStackTraceHead;
 #else
   return nullptr;
@@ -198,7 +198,7 @@
 }
 
 void llvm::RestorePrettyStackState(const void *Top) {
-#if defined(HAVE_BACKTRACE) && ENABLE_BACKTRACES
+#if ENABLE_BACKTRACES
   PrettyStackTraceHead =
       static_cast<PrettyStackTraceEntry *>(const_cast<void *>(Top));
 #endif