diff -Naurp gcc/config/avr/avr.c gcc/config/avr/avr.c
--- gcc/config/avr/avr.c	2011-10-27 18:05:35.000000000 +0530
+++ gcc/config/avr/avr.c	2011-10-27 18:10:00.000000000 +0530
@@ -255,6 +255,8 @@ static const struct default_options avr_
 #undef TARGET_EXPAND_BUILTIN
 #define TARGET_EXPAND_BUILTIN avr_expand_builtin
 
+#undef TARGET_HELP
+#define TARGET_HELP avr_target_help
 
  /* Implement TARGET_SCALAR_MODE_SUPPORTED_P.  */
  static bool
@@ -276,7 +278,24 @@ static const struct default_options avr_
    return default_fixed_point_supported_p ();
  }
  
- 
+/* Implement TARGET_HELP.  */
+void
+avr_target_help (void)
+{
+   if (avr_list_supported_parts)
+      {
+        const struct mcu_type_s *list_part;
+        fprintf (stdout, "List of parts supported by avr-gcc:\n");
+        for (list_part = &avr_mcu_types[0]; (list_part + 1)->name; list_part++)
+          {
+            if (!list_part->macro)
+               list_part++;
+            fprintf (stdout, "%-20s%s\n", list_part->name, list_part->macro);
+          }
+         fprintf (stdout, "\n");
+      }
+}
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 static void
diff -Naurp gcc/config/avr/avr.opt gcc/config/avr/avr.opt
--- gcc/config/avr/avr.opt	2011-10-27 18:05:13.000000000 +0530
+++ gcc/config/avr/avr.opt	2011-10-27 18:10:00.000000000 +0530
@@ -58,3 +58,8 @@ Relax branches
 mpmem-wrap-around
 Target Report
 Make the linker relaxation machine assume that a program counter wrap-around occurs.
+
+mlist-devices
+Target RejectNegative Var(avr_list_supported_parts)
+Print the list of parts supported while printing --target-help
+