re PR c++/17431 (Internal error: Segmentation fault (program cc1plus))

cp:
	PR c++/17431
	* call.c (standard_conversion): Add FLAGS parameter. Do not allow
	derived to base conversion when checking constructor
	accessibility.
	(implicit_conversion): Pass FLAGS to standard_conversion.
	(check_constructir_callable): Disallow conversion functions.
testsuite:
	PR c++/17431
	* g++.dg/overload/arg1.C: New.
	* g++.dg/overload/arg2.C: New.
	* g++.dg/overload/arg3.C: New.
	* g++.dg/overload/arg4.C: New.

From-SVN: r91559

gcc/cp/ChangeLog

+2004-12-01  Nathan Sidwell  <nathan@codesourcery.com>
+
+	PR c++/17431
+	* call.c (standard_conversion): Add FLAGS parameter. Do not allow
+	derived to base conversion when checking constructor
+	accessibility.
+	(implicit_conversion): Pass FLAGS to standard_conversion.
+	(check_constructir_callable): Disallow conversion functions.
+
 2004-11-30  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* parser.c: Fix comment typos.

gcc/cp/call.c

@@ -170,7 +170,7 @@ static struct z_candidate *add_conv_candidate
 static struct z_candidate *add_function_candidate 
 	(struct z_candidate **, tree, tree, tree, tree, tree, int);
 static conversion *implicit_conversion (tree, tree, tree, int);
-static conversion *standard_conversion (tree, tree, tree);
+static conversion *standard_conversion (tree, tree, tree, int);
 static conversion *reference_binding (tree, tree, tree, int);
 static conversion *build_conv (conversion_kind, tree, conversion *);
 static bool is_subseq (conversion *, conversion *);
@@ -583,7 +583,7 @@ strip_top_quals (tree t)
    also pass the expression EXPR to convert from.  */
 
 static conversion *
-standard_conversion (tree to, tree from, tree expr)
+standard_conversion (tree to, tree from, tree expr, int flags)
 {
   enum tree_code fcode, tcode;
   conversion *conv;
@@ -633,7 +633,7 @@ standard_conversion (tree to, tree from, tree expr)
          the standard conversion sequence to perform componentwise
          conversion.  */
       conversion *part_conv = standard_conversion
-        (TREE_TYPE (to), TREE_TYPE (from), NULL_TREE);
+        (TREE_TYPE (to), TREE_TYPE (from), NULL_TREE, flags);
       
       if (part_conv)
         {
@@ -815,7 +815,8 @@ standard_conversion (tree to, tree from, tree expr)
   else if (fcode == VECTOR_TYPE && tcode == VECTOR_TYPE
 	   && vector_types_convertible_p (from, to))
     return build_conv (ck_std, to, conv);
-  else if (IS_AGGR_TYPE (to) && IS_AGGR_TYPE (from)
+  else if (!(flags & LOOKUP_CONSTRUCTOR_CALLABLE)
+	   && IS_AGGR_TYPE (to) && IS_AGGR_TYPE (from)
 	   && is_properly_derived_from (from, to))
     {
       if (conv->kind == ck_rvalue)
@@ -1227,7 +1228,7 @@ implicit_conversion (tree to, tree from, tree expr, int flags)
   if (TREE_CODE (to) == REFERENCE_TYPE)
     conv = reference_binding (to, from, expr, flags);
   else
-    conv = standard_conversion (to, from, expr);
+    conv = standard_conversion (to, from, expr, flags);
 
   if (conv)
     return conv;
@@ -4081,6 +4082,7 @@ check_constructor_callable (tree type, tree expr)
 			     build_tree_list (NULL_TREE, expr), 
 			     type,
 			     LOOKUP_NORMAL | LOOKUP_ONLYCONVERTING
+			     | LOOKUP_NO_CONVERSION
 			     | LOOKUP_CONSTRUCTOR_CALLABLE);
 }
 

gcc/testsuite/ChangeLog

+2004-12-01  Nathan Sidwell  <nathan@codesourcery.com>
+
+	PR c++/17431
+	* g++.dg/overload/arg1.C: New.
+	* g++.dg/overload/arg2.C: New.
+	* g++.dg/overload/arg3.C: New.
+	* g++.dg/overload/arg4.C: New.
+
 2004-12-01  Joseph S. Myers  <joseph@codesourcery.com>
 
 	* gcc.dg/c99-flex-array-4.c: Remove.

gcc/testsuite/g++.dg/overload/arg1.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 30 Nov 2004 <nathan@codesourcery.com>
+
+// PR 17431. copy ctor from user conv
+// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
+
+struct A {};
+
+struct B : A
+{
+  B(int); // { dg-error "" "" }
+  B(B &); // { dg-error "" "" }
+  B(A); // { dg-error "" "" }
+};
+
+void foo(B);
+
+void bar()
+{
+  foo(0); // { dg-error "no matching function|initializing" "" }
+}

gcc/testsuite/g++.dg/overload/arg2.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 30 Nov 2004 <nathan@codesourcery.com>
+
+// PR 17431. copy ctor from user conv
+// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
+
+struct A {};
+
+struct B : A
+{
+  B(int);
+  B(A);
+};
+
+void foo(B);
+
+void bar()
+{
+  foo(0);
+}

gcc/testsuite/g++.dg/overload/arg3.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 30 Nov 2004 <nathan@codesourcery.com>
+
+// PR 17431. copy ctor from user conv
+// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
+
+struct A {};
+
+struct B : A
+{
+  B(int); // { dg-error "" "" }
+  B(B&);  // { dg-error "" "" }
+};
+
+void foo(B);
+
+void bar()
+{
+  foo(0); // { dg-error "no matching function|initializing" "" }
+}

gcc/testsuite/g++.dg/overload/arg4.C

+// { dg-do compile }
+
+// Copyright (C) 2004 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 30 Nov 2004 <nathan@codesourcery.com>
+
+// PR 17431. copy ctor from user conv
+// Origin: Volker Reichelt <reichelt@gcc.gnu.org>
+
+struct A {};
+
+struct B : A
+{
+  B(int);  // { dg-error "" "" }
+  B(B&);   // { dg-error "" "" }
+  B(A);    // { dg-error "" "" }
+};
+
+struct C
+{
+  operator B () const;  
+};
+
+
+void foo(B);
+
+void bar()
+{
+  C c;
+  foo(c); // { dg-error "no matching function|initializing" "" }
+}