Index: llvm/lib/Support/Unix/Process.inc
===================================================================
--- llvm/lib/Support/Unix/Process.inc
+++ llvm/lib/Support/Unix/Process.inc
@@ -331,6 +331,23 @@
 static ManagedStatic<std::mutex> TermColorMutex;
 #endif
 
+bool checkTerminalEnvironmentForColors() {
+  if (const char *TermStr = std::getenv("TERM")) {
+    return StringSwitch<bool>(TermStr)
+      .Case("ansi", true)
+      .Case("cygwin", true)
+      .Case("linux", true)
+      .StartsWith("screen", true)
+      .StartsWith("xterm", true)
+      .StartsWith("vt100", true)
+      .StartsWith("rxvt", true)
+      .EndsWith("color", true)
+      .Default(false);
+  }
+
+  return false;
+}
+
 static bool terminalHasColors(int fd) {
 #ifdef LLVM_ENABLE_TERMINFO
   // First, acquire a global lock because these C routines are thread hostile.
@@ -356,7 +373,8 @@
   //
   // The 'tigetnum' routine returns -2 or -1 on errors, and might return 0 if
   // the terminfo says that no colors are supported.
-  bool HasColors = tigetnum(const_cast<char *>("colors")) > 0;
+  int colors_ti = tigetnum(const_cast<char *>("colors"));
+  bool HasColors = colors_ti >= 0 ? colors_ti : checkTerminalEnvironmentForColors();
 
   // Now extract the structure allocated by setupterm and free its memory
   // through a really silly dance.
@@ -364,27 +382,12 @@
   (void)del_curterm(termp); // Drop any errors here.
 
   // Return true if we found a color capabilities for the current terminal.
-  if (HasColors)
-    return true;
+  return HasColors;
 #else
   // When the terminfo database is not available, check if the current terminal
   // is one of terminals that are known to support ANSI color escape codes.
-  if (const char *TermStr = std::getenv("TERM")) {
-    return StringSwitch<bool>(TermStr)
-      .Case("ansi", true)
-      .Case("cygwin", true)
-      .Case("linux", true)
-      .StartsWith("screen", true)
-      .StartsWith("xterm", true)
-      .StartsWith("vt100", true)
-      .StartsWith("rxvt", true)
-      .EndsWith("color", true)
-      .Default(false);
-  }
+  return checkTerminalEnvironmentForColors();
 #endif
-
-  // Otherwise, be conservative.
-  return false;
 }
 
 bool Process::FileDescriptorHasColors(int fd) {