re PR middle-end/6196 (ICE in copy_to_mode_reg, at explow.c:711)

	PR c++/6196
	* pt.c (tsubst_copy_and_build): Correct handling of
	address-of-label extension.
	* semantics.c (finish_goto_stmt): The address of a label must go
	through the lvalue-to-rvalue conversion.

	PR c++/6196
	* g++.dg/ext/label1.C: New test.
	* g++.dg/ext/label2.C: Likewise.

From-SVN: r70932

gcc/cp/pt.c

@@ -7972,6 +7972,8 @@ tsubst_copy_and_build (tree t,
       else
 	op1 = tsubst_non_call_postfix_expression (op1, args, complain, 
 						  in_decl);
+      if (TREE_CODE (op1) == LABEL_DECL)
+	return finish_label_address_expr (DECL_NAME (op1));
       return build_x_unary_op (ADDR_EXPR, op1);
 
     case PLUS_EXPR:

gcc/cp/semantics.c

@@ -378,13 +378,17 @@ finish_goto_stmt (tree destination)
      mark the used labels as used.  */
   if (TREE_CODE (destination) == LABEL_DECL)
     TREE_USED (destination) = 1;
-    
-  if (TREE_CODE (destination) != LABEL_DECL)
-    /* We don't inline calls to functions with computed gotos.
-       Those functions are typically up to some funny business,
-       and may be depending on the labels being at particular
-       addresses, or some such.  */
-    DECL_UNINLINABLE (current_function_decl) = 1;
+  else
+    {
+      /* The DESTINATION is being used as an rvalue.  */
+      if (!processing_template_decl)
+	destination = decay_conversion (destination);
+      /* We don't inline calls to functions with computed gotos.
+	 Those functions are typically up to some funny business,
+	 and may be depending on the labels being at particular
+	 addresses, or some such.  */
+      DECL_UNINLINABLE (current_function_decl) = 1;
+    }
   
   check_goto (destination);
 

gcc/testsuite/ChangeLog

+2003-08-29  Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/6196
+	* g++.dg/ext/label1.C: New test.
+	* g++.dg/ext/label2.C: Likewise.
+
 2003-08-28  Mark Mitchell  <mark@codesourcery.com>
 
 	* g++.dg/expr/cond3.C: New test.

gcc/testsuite/g++.dg/ext/label1.C

+// { dg-options "" }
+
+int main(void) {
+  static const void* lbls[2][2] = {{&&lbl0, &&lbl0}, {&&lbl0, &&lbl0}};
+  goto *lbls[0];
+ lbl0:
+  ;
+}

gcc/testsuite/g++.dg/ext/label2.C

+// { dg-options "" }
+
+template <typename T>
+void f() {
+ l:
+  void *p[] = { &&l };
+
+  goto *p;
+}
+
+template void f<int>();