re PR c++/66130 ("invalid use of non-static member function" message could be clearer)

2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/66130
	* typeck.c (invalid_nonstatic_memfn_p): Add location_t parameter and
	use it in the diagnostic.
	(decay_conversion): Adjust call.
	* semantics.c (finish_decltype_type): Likewise.
	* call.c (resolve_args, build_new_op_1,
	perform_implicit_conversion_flags): Adjust calls.
	* cvt.c (ocp_convert, convert_to_void): Likewise.
	* cp-tree.h (invalid_nonstatic_memfn_p): Update declaration.

2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/66130
	* g++.dg/other/pr66130.C: New.
	* g++.dg/cpp0x/pr66130.C: Likewise.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>

From-SVN: r224099

gcc/cp/ChangeLog

+2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
+	    Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/66130
+	* typeck.c (invalid_nonstatic_memfn_p): Add location_t parameter and
+	use it in the diagnostic.
+	(decay_conversion): Adjust call.
+	* semantics.c (finish_decltype_type): Likewise.
+	* call.c (resolve_args, build_new_op_1,
+	perform_implicit_conversion_flags): Adjust calls.
+	* cvt.c (ocp_convert, convert_to_void): Likewise.
+	* cp-tree.h (invalid_nonstatic_memfn_p): Update declaration.
+
 2015-06-03  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* decl.c (check_tag_decl): Use declspecs->locations as locations in

gcc/cp/call.c

@@ -3941,7 +3941,7 @@ resolve_args (vec<tree, va_gc> *args, tsubst_flags_t complain)
 	    error ("invalid use of void expression");
 	  return NULL;
 	}
-      else if (invalid_nonstatic_memfn_p (arg, complain))
+      else if (invalid_nonstatic_memfn_p (input_location, arg, complain))
 	return NULL;
     }
   return args;
@@ -5542,9 +5542,9 @@ build_new_op_1 (location_t loc, enum tree_code code, int flags, tree arg1,
 		/* If one of the arguments of the operator represents
 		   an invalid use of member function pointer, try to report
 		   a meaningful error ...  */
-		if (invalid_nonstatic_memfn_p (arg1, tf_error)
-		    || invalid_nonstatic_memfn_p (arg2, tf_error)
-		    || invalid_nonstatic_memfn_p (arg3, tf_error))
+	      if (invalid_nonstatic_memfn_p (loc, arg1, tf_error)
+		    || invalid_nonstatic_memfn_p (loc, arg2, tf_error)
+		    || invalid_nonstatic_memfn_p (loc, arg3, tf_error))
 		  /* We displayed the error message.  */;
 		else
 		  {
@@ -9445,7 +9445,7 @@ perform_implicit_conversion_flags (tree type, tree expr,
 	     Call instantiate_type to get good error messages.  */
 	  if (TREE_TYPE (expr) == unknown_type_node)
 	    instantiate_type (type, expr, complain);
-	  else if (invalid_nonstatic_memfn_p (expr, complain))
+	  else if (invalid_nonstatic_memfn_p (loc, expr, complain))
 	    /* We gave an error.  */;
 	  else
 	    error_at (loc, "could not convert %qE from %qT to %qT", expr,

gcc/cp/cp-tree.h

@@ -6281,7 +6281,8 @@ extern tree build_address			(tree);
 extern tree build_nop				(tree, tree);
 extern tree non_reference			(tree);
 extern tree lookup_anon_field			(tree, tree);
-extern bool invalid_nonstatic_memfn_p		(tree, tsubst_flags_t);
+extern bool invalid_nonstatic_memfn_p		(location_t, tree,
+						 tsubst_flags_t);
 extern tree convert_member_func_to_ptr		(tree, tree, tsubst_flags_t);
 extern tree convert_ptrmem			(tree, tree, bool, bool,
 						 tsubst_flags_t);

gcc/cp/cvt.c

@@ -902,7 +902,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags,
     {
       /* If the conversion failed and expr was an invalid use of pointer to
 	 member function, try to report a meaningful error.  */
-      if (invalid_nonstatic_memfn_p (expr, complain))
+      if (invalid_nonstatic_memfn_p (loc, expr, complain))
 	/* We displayed the error message.  */;
       else
 	error_at (loc, "conversion from %qT to non-scalar type %qT requested",
@@ -960,7 +960,7 @@ convert_to_void (tree expr, impl_conv_void implicit, tsubst_flags_t complain)
 
   if (!TREE_TYPE (expr))
     return expr;
-  if (invalid_nonstatic_memfn_p (expr, complain))
+  if (invalid_nonstatic_memfn_p (loc, expr, complain))
     return error_mark_node;
   if (TREE_CODE (expr) == PSEUDO_DTOR_EXPR)
     {

gcc/cp/semantics.c

@@ -7237,7 +7237,7 @@ finish_decltype_type (tree expr, bool id_expression_or_member_access_p,
 
   expr = resolve_nondeduced_context (expr);
 
-  if (invalid_nonstatic_memfn_p (expr, complain))
+  if (invalid_nonstatic_memfn_p (input_location, expr, complain))
     return error_mark_node;
 
   if (type_unknown_p (expr))

gcc/cp/typeck.c

@@ -1810,7 +1810,7 @@ cxx_alignas_expr (tree e)
    violates these rules.  */
 
 bool
-invalid_nonstatic_memfn_p (tree expr, tsubst_flags_t complain)
+invalid_nonstatic_memfn_p (location_t loc, tree expr, tsubst_flags_t complain)
 {
   if (expr == NULL_TREE)
     return false;
@@ -1822,7 +1822,17 @@ invalid_nonstatic_memfn_p (tree expr, tsubst_flags_t complain)
   if (DECL_NONSTATIC_MEMBER_FUNCTION_P (expr))
     {
       if (complain & tf_error)
-        error ("invalid use of non-static member function");
+	{
+	  if (DECL_P (expr))
+	    {
+	      error_at (loc, "invalid use of non-static member function %qD",
+			expr);
+	      inform (DECL_SOURCE_LOCATION (expr), "declared here");
+	    }
+	  else
+	    error_at (loc, "invalid use of non-static member function of "
+		      "type %qT", TREE_TYPE (expr));
+	}
       return true;
     }
   return false;
@@ -1946,7 +1956,7 @@ decay_conversion (tree exp, tsubst_flags_t complain)
 	error_at (loc, "void value not ignored as it ought to be");
       return error_mark_node;
     }
-  if (invalid_nonstatic_memfn_p (exp, complain))
+  if (invalid_nonstatic_memfn_p (loc, exp, complain))
     return error_mark_node;
   if (code == FUNCTION_TYPE || is_overloaded_fn (exp))
     return cp_build_addr_expr (exp, complain);

gcc/testsuite/ChangeLog

+2015-06-03  Manuel López-Ibáñez  <manu@gcc.gnu.org>
+	    Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/66130
+	* g++.dg/other/pr66130.C: New.
+	* g++.dg/cpp0x/pr66130.C: Likewise.
+
 2015-06-03  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/cpp0x/decl-loc1.C: New.

gcc/testsuite/g++.dg/cpp0x/pr66130.C

+// PR c++/66130
+// { dg-do compile { target c++11 } }
+
+struct Local
+{
+  void f();
+};
+
+Local *l;
+void (Local::*ptr)();
+decltype((l->*ptr)) i;  // { dg-error "member function of type 'void \\(Local::\\)\\(\\)'" }

gcc/testsuite/g++.dg/other/pr66130.C

+// PR c++/66130
+
+struct X {
+  X(void *);
+  void m();  // { dg-message "declared here" }
+};
+
+struct Y : public X{
+  Y(void*a, void *b) : X(m), mb(b) { }  // { dg-error "member function 'void X::m\\(\\)'" }
+  void *mb;
+};