From a163d0b5de9e268411f51ad28d6ea34bf6e9a88c Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Wed, 25 Jan 2012 06:07:15 +0000
Subject: Fix -fmacro-backtrace-limit=0 to show the entire macro backtrace.

llvm-svn: 148930
---
 clang/lib/Frontend/DiagnosticRenderer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'clang/lib/Frontend/DiagnosticRenderer.cpp')

diff --git a/clang/lib/Frontend/DiagnosticRenderer.cpp b/clang/lib/Frontend/DiagnosticRenderer.cpp
index 9c4976c2103..062b8a9d127 100644
--- a/clang/lib/Frontend/DiagnosticRenderer.cpp
+++ b/clang/lib/Frontend/DiagnosticRenderer.cpp
@@ -260,7 +260,8 @@ void DiagnosticRenderer::emitMacroExpansionsAndCarets(
   Loc = getImmediateMacroCalleeLoc(SM, Loc);
   
   unsigned MacroSkipStart = 0, MacroSkipEnd = 0;
-  if (MacroDepth > DiagOpts.MacroBacktraceLimit) {
+  if (MacroDepth > DiagOpts.MacroBacktraceLimit &&
+      DiagOpts.MacroBacktraceLimit != 0) {
     MacroSkipStart = DiagOpts.MacroBacktraceLimit / 2 +
     DiagOpts.MacroBacktraceLimit % 2;
     MacroSkipEnd = MacroDepth - DiagOpts.MacroBacktraceLimit / 2;
-- 
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