avr.c (valid_machine_decl_attribute): Allow `extern' declaration for data with "progmem" attribute.

	* config/avr/avr.c (valid_machine_decl_attribute): Allow `extern'
	declaration for data with "progmem" attribute.

From-SVN: r36829

gcc/ChangeLog

+Tue Oct 10 23:14:33 2000  Denis Chertykov  <denisc@overta.ru>
+
+	* config/avr/avr.c (valid_machine_decl_attribute): Allow `extern'
+	declaration for data with "progmem" attribute.
+
 2000-10-09  Marek Michalkiewicz  <marekm@linux.org.pl>
 
 	* config/avr/avr.c (out_shift_with_cnt): Use AS2 macro.

gcc/config/avr/avr.c

@@ -4318,7 +4318,7 @@ valid_machine_decl_attribute (decl, attributes, attr, args)
   if (is_attribute_p ("progmem", attr)
       && (TREE_STATIC (decl) || DECL_EXTERNAL (decl)))
     {
-      if (DECL_INITIAL (decl) == NULL_TREE)
+      if (DECL_INITIAL (decl) == NULL_TREE && !DECL_EXTERNAL (decl))
 	{
 	  warning ("Only initialized variables can be placed into "
 		   "program memory area.");