re PR c++/71835 (ICE on invalid C++ code with ambiguous overloaded operators:…

re PR c++/71835 (ICE on invalid C++ code with ambiguous overloaded operators: tree check: expected tree that contains ‘decl minimal’ structure, have ‘pointer_type’ in convert_like_real, at cp/call.c:6549)

	PR c++/71835
	* call.c (build_op_call_1): Use convert_like_with_context only
	if cand->fn is a decl.

	* g++.dg/conversion/ambig3.C: New test.

From-SVN: r238443

gcc/cp/ChangeLog

 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71835
+	* call.c (build_op_call_1): Use convert_like_with_context only
+	if cand->fn is a decl.
+
 	PR c++/71828
 	* constexpr.c (cxx_eval_constant_expression) <case REALPART_EXPR>:
 	For lval don't use cxx_eval_unary_expression and instead recurse

gcc/cp/call.c

@@ -4412,8 +4412,11 @@ build_op_call_1 (tree obj, vec<tree, va_gc> **args, tsubst_flags_t complain)
 	result = build_over_call (cand, LOOKUP_NORMAL, complain);
       else
 	{
-	  obj = convert_like_with_context (cand->convs[0], obj, cand->fn, -1,
-					   complain);
+	  if (DECL_P (cand->fn))
+	    obj = convert_like_with_context (cand->convs[0], obj, cand->fn,
+					     -1, complain);
+	  else
+	    obj = convert_like (cand->convs[0], obj, complain);
 	  obj = convert_from_reference (obj);
 	  result = cp_build_function_call_vec (obj, args, complain);
 	}

gcc/testsuite/ChangeLog

 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/71835
+	* g++.dg/conversion/ambig3.C: New test.
+
 	PR c++/71828
 	* g++.dg/cpp0x/constexpr-71828.C: New test.
 

gcc/testsuite/g++.dg/conversion/ambig3.C

+// PR c++/71835
+// { dg-do compile }
+
+typedef void T (int);
+struct A { operator T * (); };	// { dg-message "candidate" }
+struct B { operator T * (); };	// { dg-message "candidate" }
+struct C : A, B {} c;
+
+void
+foo ()
+{
+  c (0);		// { dg-error "is ambiguous" }
+}