Index: lldb/trunk/include/lldb/Host/File.h
===================================================================
--- lldb/trunk/include/lldb/Host/File.h
+++ lldb/trunk/include/lldb/Host/File.h
@@ -54,13 +54,15 @@
       : IOObject(eFDTypeFile, false), m_descriptor(kInvalidDescriptor),
         m_stream(kInvalidStream), m_options(0), m_own_stream(false),
         m_is_interactive(eLazyBoolCalculate),
-        m_is_real_terminal(eLazyBoolCalculate) {}
+        m_is_real_terminal(eLazyBoolCalculate),
+        m_supports_colors(eLazyBoolCalculate) {}
 
   File(FILE *fh, bool transfer_ownership)
       : IOObject(eFDTypeFile, false), m_descriptor(kInvalidDescriptor),
         m_stream(fh), m_options(0), m_own_stream(transfer_ownership),
         m_is_interactive(eLazyBoolCalculate),
-        m_is_real_terminal(eLazyBoolCalculate) {}
+        m_is_real_terminal(eLazyBoolCalculate),
+        m_supports_colors(eLazyBoolCalculate) {}
 
   //------------------------------------------------------------------
   /// Constructor with path.
Index: lldb/trunk/lit/Settings/TestDisableColor.test
===================================================================
--- lldb/trunk/lit/Settings/TestDisableColor.test
+++ lldb/trunk/lit/Settings/TestDisableColor.test
@@ -0,0 +1,7 @@
+# RUN: %lldb -x -b -s %s | FileCheck %s
+settings show use-color
+q
+# This tests that LLDB turns off use-color if the output file is not an
+# interactive terminal. In this example, use-color should be off because LLDB
+# is run just by the non-interactive lit test runner.
+# CHECK: use-color (boolean) = false
Index: lldb/trunk/lit/Settings/lit.local.cfg
===================================================================
--- lldb/trunk/lit/Settings/lit.local.cfg
+++ lldb/trunk/lit/Settings/lit.local.cfg
@@ -0,0 +1 @@
+config.suffixes = ['.test']
Index: lldb/trunk/source/Core/Debugger.cpp
===================================================================
--- lldb/trunk/source/Core/Debugger.cpp
+++ lldb/trunk/source/Core/Debugger.cpp
@@ -804,6 +804,9 @@
   const char *term = getenv("TERM");
   if (term && !strcmp(term, "dumb"))
     SetUseColor(false);
+  // Turn off use-color if we don't write to a terminal with color support.
+  if (!m_output_file_sp->GetFile().GetIsTerminalWithColors())
+    SetUseColor(false);
 }
 
 Debugger::~Debugger() { Clear(); }