Index: lib/Support/Windows/Process.inc
===================================================================
--- lib/Support/Windows/Process.inc
+++ lib/Support/Windows/Process.inc
@@ -328,7 +328,15 @@
 
 static bool UseANSI = false;
 void Process::UseANSIEscapeCodes(bool enable) {
-  UseANSI = enable;
+  if (enable) {
+    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
+    DWORD consoleMode;
+    GetConsoleMode(hConsole, &consoleMode);
+    consoleMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    UseANSI = SetConsoleMode(hConsole, consoleMode);
+  } else {
+    UseANSI = false;
+  }
 }
 
 namespace {
Index: lib/Support/Windows/WindowsSupport.h
===================================================================
--- lib/Support/Windows/WindowsSupport.h
+++ lib/Support/Windows/WindowsSupport.h
@@ -34,6 +34,10 @@
 #define NOMINMAX
 #endif
 
+#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
+#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
+#endif
+
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"