LWG 2165

	LWG 2165
	* method.c (defaulted_late_check): Delete on eh-spec mismatch.
	(maybe_explain_implicit_delete): Explain it.

From-SVN: r203989

gcc/cp/ChangeLog

 2013-10-23  Jason Merrill  <jason@redhat.com>
 
+	LWG 2165
+	* method.c (defaulted_late_check): Delete on eh-spec mismatch.
+	(maybe_explain_implicit_delete): Explain it.
+
 	* error.c (eh_spec_to_string): New.
 	(cp_printer): Use it for %X.
 

gcc/cp/method.c

@@ -1466,13 +1466,34 @@ maybe_explain_implicit_delete (tree decl)
 	  tree parms = FUNCTION_FIRST_USER_PARMTYPE (decl);
 	  tree parm_type = TREE_VALUE (parms);
 	  bool const_p = CP_TYPE_CONST_P (non_reference (parm_type));
+	  tree raises = NULL_TREE;
+	  bool deleted_p = false;
 	  tree scope = push_scope (ctype);
-	  inform (0, "%q+#D is implicitly deleted because the default "
-		 "definition would be ill-formed:", decl);
-	  pop_scope (scope);
+
 	  synthesized_method_walk (ctype, sfk, const_p,
-				   NULL, NULL, NULL, NULL, true,
+				   &raises, NULL, &deleted_p, NULL, false,
 				   DECL_INHERITED_CTOR_BASE (decl), parms);
+	  if (deleted_p)
+	    {
+	      inform (0, "%q+#D is implicitly deleted because the default "
+		      "definition would be ill-formed:", decl);
+	      synthesized_method_walk (ctype, sfk, const_p,
+				       NULL, NULL, NULL, NULL, true,
+				       DECL_INHERITED_CTOR_BASE (decl), parms);
+	    }
+	  else if (!comp_except_specs
+		   (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (decl)),
+		    raises, ce_normal))
+	    inform (DECL_SOURCE_LOCATION (decl), "%q#F is implicitly "
+		    "deleted because its exception-specification does not "
+		    "match the implicit exception-specification %qX",
+		    decl, raises);
+#ifdef ENABLE_CHECKING
+	  else
+	    gcc_unreachable ();
+#endif
+
+	  pop_scope (scope);
 	}
 
       input_location = loc;
@@ -1782,9 +1803,10 @@ defaulted_late_check (tree fn)
 			      eh_spec, ce_normal))
 	{
 	  if (DECL_DEFAULTED_IN_CLASS_P (fn))
-	    error ("function %q+D defaulted on its first declaration "
-		   "with an exception-specification that differs from "
-		   "the implicit declaration %q#D", fn, implicit_fn);
+	    {
+	      DECL_DELETED_FN (fn) = true;
+	      eh_spec = TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn));
+	    }
 	  else
 	    error ("function %q+D defaulted on its redeclaration "
 		   "with an exception-specification that differs from "

gcc/testsuite/g++.dg/cpp0x/defaulted23.C

@@ -6,22 +6,32 @@ struct A
   A() noexcept = default;
 };
 
+A a;
+
 struct B
 {
-  B() throw (int) = default; // { dg-error "exception-specification that differs from the implicit declaration" }
+  B() throw (int) = default; // { dg-message "exception-specification" }
 };
 
+B b;				// { dg-error "deleted" }
+
 struct C
 {
   C() throw (int) { }
 };
 
+C c;
+
 struct D: C
 {
   D() throw (int) = default;
 };
 
+D d;
+
 struct E
 {
   E() = default;
 };
+
+E e;

gcc/testsuite/g++.dg/cpp0x/defaulted43.C

@@ -7,6 +7,8 @@ struct T
   ~T() noexcept(false) { }
 };
 
+T t;
+
 struct A
 {
   A() noexcept;
@@ -24,6 +26,8 @@ struct U
   ~U() noexcept(false) { }
 };
 
+U u;
+
 struct B
 {
   B() noexcept(false);
@@ -35,16 +39,22 @@ struct B
 B::B() noexcept(false) = default;
 B::~B() noexcept(false) = default;
 
+B b;
+
 struct V
 {
   V() noexcept(false) { }
   ~V() noexcept(false) { }
 };
 
+V v;
+
 struct C
 {
-  C() noexcept = default;     // { dg-error "defaulted" }
-  ~C() noexcept = default;    // { dg-error "defaulted" }
+  C() noexcept = default;	// { dg-message "exception-specification" }
+  ~C() noexcept = default;	// { dg-message "exception-specification" }
 
   V v;
 };
+
+C c;				// { dg-error "deleted" }