Revert "Fix conversions for built-in operator overloading candidates."

This reverts commit 948d5b831affef14a49f56804b01e3f1ba00cdb3.

From-SVN: r275976

gcc/cp/ChangeLog

+2019-09-19  Jason Merrill  <jason@redhat.com>
+
+	Revert:
+	* call.c (build_new_op_1): Don't apply any standard conversions to
+	the operands of a built-in operator.  Don't suppress conversions in
+	cp_build_unary_op.
+	* typeck.c (cp_build_unary_op): Do integral promotions for enums.
+
 2019-09-16  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* decl.c (grokdeclarator): Use declspecs->locations and

gcc/cp/call.c

@@ -6142,40 +6142,41 @@ build_new_op_1 (const op_location_t &loc, enum tree_code code, int flags,
 	      break;
 	    }
 
-	  /* "If a built-in candidate is selected by overload resolution, the
-	     operands of class type are converted to the types of the
-	     corresponding parameters of the selected operation function,
-	     except that the second standard conversion sequence of a
-	     user-defined conversion sequence (12.3.3.1.2) is not applied."  */
+	  /* We need to strip any leading REF_BIND so that bitfields
+	     don't cause errors.  This should not remove any important
+	     conversions, because builtins don't apply to class
+	     objects directly.  */
 	  conv = cand->convs[0];
-	  if (conv->user_conv_p)
-	    {
-	      while (conv->kind != ck_user)
-		conv = next_conversion (conv);
-	      arg1 = convert_like (conv, arg1, complain);
-	    }
+	  if (conv->kind == ck_ref_bind)
+	    conv = next_conversion (conv);
+	  arg1 = convert_like (conv, arg1, complain);
 
 	  if (arg2)
 	    {
 	      conv = cand->convs[1];
-	      if (conv->user_conv_p)
-		{
-		  while (conv->kind != ck_user)
-		    conv = next_conversion (conv);
-		  arg2 = convert_like (conv, arg2, complain);
-		}
-	    }
+	      if (conv->kind == ck_ref_bind)
+		conv = next_conversion (conv);
+	      else
+		arg2 = decay_conversion (arg2, complain);
 
+	      /* We need to call warn_logical_operator before
+		 converting arg2 to a boolean_type, but after
+		 decaying an enumerator to its value.  */
+	      if (complain & tf_warning)
+		warn_logical_operator (loc, code, boolean_type_node,
+				       code_orig_arg1, arg1,
+				       code_orig_arg2, arg2);
+
+	      arg2 = convert_like (conv, arg2, complain);
+	    }
 	  if (arg3)
 	    {
 	      conv = cand->convs[2];
-	      if (conv->user_conv_p)
-		{
-		  while (conv->kind != ck_user)
-		    conv = next_conversion (conv);
-		  arg3 = convert_like (conv, arg3, complain);
-		}
+	      if (conv->kind == ck_ref_bind)
+		conv = next_conversion (conv);
+	      convert_like (conv, arg3, complain);
 	    }
+
 	}
     }
 
@@ -6243,7 +6244,7 @@ build_new_op_1 (const op_location_t &loc, enum tree_code code, int flags,
     case REALPART_EXPR:
     case IMAGPART_EXPR:
     case ABS_EXPR:
-      return cp_build_unary_op (code, arg1, false, complain);
+      return cp_build_unary_op (code, arg1, candidates != 0, complain);
 
     case ARRAY_REF:
       return cp_build_array_ref (input_location, arg1, arg2, complain);

gcc/cp/typeck.c

@@ -6249,7 +6249,7 @@ cp_build_unary_op (enum tree_code code, tree xarg, bool noconvert,
 		       : _("wrong type argument to unary plus"));
 	else
 	  {
-	    if (!noconvert && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg)))
+	    if (!noconvert && CP_INTEGRAL_TYPE_P (TREE_TYPE (arg)))
 	      arg = cp_perform_integral_promotions (arg, complain);
 
 	    /* Make sure the result is not an lvalue: a unary plus or minus
@@ -6274,7 +6274,7 @@ cp_build_unary_op (enum tree_code code, tree xarg, bool noconvert,
 						   | WANT_VECTOR_OR_COMPLEX,
 						   arg, true)))
 	errstring = _("wrong type argument to bit-complement");
-      else if (!noconvert && INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (arg)))
+      else if (!noconvert && CP_INTEGRAL_TYPE_P (TREE_TYPE (arg)))
 	{
 	  /* Warn if the expression has boolean value.  */
 	  if (TREE_CODE (TREE_TYPE (arg)) == BOOLEAN_TYPE