re PR c++/20212 (attribute unused vs. member function template)

	PR c++/20212
	* pt.c (regenerate_decl_from_template): Copy attributes for
	parameters from the pattern to the instantiation.

	PR c++/20212
	* g++.dg/warn/Wunused-11.C: New test.

From-SVN: r97726

gcc/cp/ChangeLog

+2005-04-06  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/20212
+	* pt.c (regenerate_decl_from_template): Copy attributes for
+	parameters from the pattern to the instantiation.
+
 2005-04-05  Mark Mitchell  <mark@codesourcery.com>
 
 	PR c++/20734

gcc/cp/pt.c

@@ -11190,6 +11190,7 @@ regenerate_decl_from_template (tree decl, tree tmpl)
       while (decl_parm)
 	{
 	  tree parm_type;
+	  tree attributes;
 
 	  if (DECL_NAME (decl_parm) != DECL_NAME (pattern_parm))
 	    DECL_NAME (decl_parm) = DECL_NAME (pattern_parm);
@@ -11198,6 +11199,12 @@ regenerate_decl_from_template (tree decl, tree tmpl)
 	  parm_type = type_decays_to (parm_type);
 	  if (!same_type_p (TREE_TYPE (decl_parm), parm_type))
 	    TREE_TYPE (decl_parm) = parm_type;
+	  attributes = DECL_ATTRIBUTES (pattern_parm);
+	  if (DECL_ATTRIBUTES (decl_parm) != attributes)
+	    {
+	      DECL_ATTRIBUTES (decl_parm) = attributes;
+	      cplus_decl_attributes (&decl_parm, attributes, /*flags=*/0);
+	    }
 	  decl_parm = TREE_CHAIN (decl_parm);
 	  pattern_parm = TREE_CHAIN (pattern_parm);
 	}

gcc/testsuite/ChangeLog

+2005-04-06  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/20212
+	* g++.dg/warn/Wunused-11.C: New test.
+
 2005-04-06  Bernd Schmidt  <bernd.schmidt@analog.com>
 
 	* gcc.c-torture/execute/20020720-1.x: Disable on bfin*-*.

gcc/testsuite/g++.dg/warn/Wunused-11.C

+// PR c++/20212
+// { dg-options "-O2 -Wunused -Wextra" }
+
+template<int> void f(int);
+void g(int i)
+{
+  f<0>(i);
+}
+template<int> void f(int i __attribute__((unused)) )
+{}
+