Index: lldb/trunk/cmake/modules/LLDBConfig.cmake
===================================================================
--- lldb/trunk/cmake/modules/LLDBConfig.cmake
+++ lldb/trunk/cmake/modules/LLDBConfig.cmake
@@ -401,3 +401,12 @@
             "- ignore this warning and accept occasional instability")
     endif()
 endif()
+
+if(MSVC)
+    set(LLDB_USE_BUILTIN_DEMANGLER ON)
+else()
+    option(LLDB_USE_BUILTIN_DEMANGLER "Use lldb's builtin demangler instead of the system one" ON)
+endif()
+if(LLDB_USE_BUILTIN_DEMANGLER)
+    add_definitions(-DLLDB_USE_BUILTIN_DEMANGLER)
+endif()
Index: lldb/trunk/source/Core/Mangled.cpp
===================================================================
--- lldb/trunk/source/Core/Mangled.cpp
+++ lldb/trunk/source/Core/Mangled.cpp
@@ -14,20 +14,15 @@
 #include "lldb/Host/windows/windows.h"
 #include <Dbghelp.h>
 #pragma comment(lib, "dbghelp.lib")
-#define LLDB_USE_BUILTIN_DEMANGLER
-#elif defined (__FreeBSD__)
-#define LLDB_USE_BUILTIN_DEMANGLER
-#else
-#include <cxxabi.h>
 #endif
 
 #ifdef LLDB_USE_BUILTIN_DEMANGLER
-
 // Provide a fast-path demangler implemented in FastDemangle.cpp until it can
 // replace the existing C++ demangler with a complete implementation
 #include "lldb/Core/FastDemangle.h"
 #include "lldb/Core/CxaDemangle.h"
-
+#else
+#include <cxxabi.h>
 #endif