re PR middle-end/29299 (gcc "used" attribute has no effect on local-scope static variables)

	PR middle-end/29299
	* cfgexpand.c (expand_used_vars_for_block): Vars marked used by user
	are used.

From-SVN: r117863

gcc/ChangeLog

+2006-10-18  Jan Hubicka  <jh@suse.cz>
+
+	PR middle-end/29299
+	* cfgexpand.c (expand_used_vars_for_block): Vars marked used by user
+	are used.
+
 2006-10-18  Marcin Dalecki  <martin@dalecki.de>
 
 	* omp-low.c (expand_parallel_call): Use BSI_SAME_STMT instead of

gcc/cfgexpand.c

@@ -764,7 +764,12 @@ expand_used_vars_for_block (tree block, bool toplevel)
 
   /* Expand all variables at this level.  */
   for (t = BLOCK_VARS (block); t ; t = TREE_CHAIN (t))
-    if (TREE_USED (t))
+    if (TREE_USED (t)
+	/* Force local static variables to be output when marked by
+	   used attribute.  For unit-at-a-time, cgraph code already takes
+	   care of this.  */
+	|| (!flag_unit_at_a_time && TREE_STATIC (t)
+	    && DECL_PRESERVE_P (t)))
       expand_one_var (t, toplevel);
 
   this_sv_num = stack_vars_num;