Index: lib/Support/Unix/Process.inc
===================================================================
--- lib/Support/Unix/Process.inc
+++ lib/Support/Unix/Process.inc
@@ -353,11 +353,15 @@
   // First, acquire a global lock because these C routines are thread hostile.
   MutexGuard G(*TermColorMutex);
 
+  // Save the current term (if set) to be restored after the test.
+  struct term *OrigTerm = set_curterm((struct term *)nullptr);
   int errret = 0;
-  if (setupterm((char *)nullptr, fd, &errret) != 0)
+  if (setupterm((char *)nullptr, fd, &errret) != 0) {
     // Regardless of why, if we can't get terminfo, we shouldn't try to print
     // colors.
+    (void)set_curterm(OrigTerm);
     return false;
+  }
 
   // Test whether the terminal as set up supports color output. How to do this
   // isn't entirely obvious. We can use the curses routine 'has_colors' but it
@@ -375,8 +379,9 @@
   bool HasColors = tigetnum(const_cast<char *>("colors")) > 0;
 
   // Now extract the structure allocated by setupterm and free its memory
-  // through a really silly dance.
-  struct term *termp = set_curterm((struct term *)nullptr);
+  // through a really silly dance. Also restore the previously saved term
+  // here.
+  struct term *termp = set_curterm(OrigTerm);
   (void)del_curterm(termp); // Drop any errors here.
 
   // Return true if we found a color capabilities for the current terminal.