1 files changed, 11 insertions, 1 deletions
diff --git a/main.c b/main.c
index 6aecd80..4a79b60 100644
--- a/main.c
+++ b/main.c
@@ -1374,7 +1374,6 @@ main (int argc, char **argv, char **envp)
 #endif
 
   /* Decode the switches.  */
-
   decode_env_switches (STRING_SIZE_TUPLE ("GNUMAKEFLAGS"));
 
   /* Clear GNUMAKEFLAGS to avoid duplication.  */
@@ -1398,6 +1397,17 @@ main (int argc, char **argv, char **envp)
 
   decode_switches (argc, (const char **)argv, 0);
 
+    /* Set a variable specifying whether stdout/stdin is hooked to a TTY.  */
+#ifdef HAVE_ISATTY
+    if (isatty (fileno (stdout)))
+      define_variable_cname ("MAKE_TTYOUT", TTYNAME (fileno (stdout)),
+                             o_default, 0)->export = v_export;
+
+    if (isatty (fileno (stderr)))
+      define_variable_cname ("MAKE_TTYERR", TTYNAME (fileno (stderr)),
+                             o_default, 0)->export = v_export;
+#endif
+
   /* Reset in case the switches changed our minds.  */
   syncing = (output_sync == OUTPUT_SYNC_LINE
              || output_sync == OUTPUT_SYNC_TARGET);