From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-prs-return-32896-listarch-gcc-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 26469 invoked by alias); 10 Apr 2003 21:16:02 -0000
Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Archive: <http://gcc.gnu.org/ml/gcc-prs/>
List-Post: <mailto:gcc-prs@gcc.gnu.org>
List-Help: <mailto:gcc-prs-help@gcc.gnu.org>
Sender: gcc-prs-owner@gcc.gnu.org
Received: (qmail 26320 invoked by uid 71); 10 Apr 2003 21:16:01 -0000
Resent-Date: 10 Apr 2003 21:16:01 -0000
Resent-Message-ID: <20030410211601.26318.qmail@sources.redhat.com>
Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer)
Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Resent-Reply-To: gcc-gnats@gcc.gnu.org, reichelt@igpm.rwth-aachen.de
Received: (qmail 24533 invoked by uid 48); 10 Apr 2003 21:14:11 -0000
Message-Id: <20030410211411.24532.qmail@sources.redhat.com>
Date: Thu, 10 Apr 2003 21:16:00 -0000
From: reichelt@igpm.rwth-aachen.de
Reply-To: reichelt@igpm.rwth-aachen.de
To: gcc-gnats@gcc.gnu.org
X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31)
Subject: c++/10371: [3.4 regression] misleading error message for illegal member access
X-SW-Source: 2003-04/txt/msg00466.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10371
>Category:       c++
>Synopsis:       [3.4 regression] misleading error message for illegal member access
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 10 21:16:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Volker Reichelt
>Release:        gcc 3.4-20030402
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
Compiling the following code with "g++ -c" I get an
error message which is quite misleading IMHO:

----------------------snip here---------------------
struct A
{
    int i;
};

template <int> struct B
{
    int foo() { return A::i; }
};

void bar() { B<0>().foo(); }
----------------------snip here---------------------

msg.cc: In member function `int B<<anonymous> >::foo() [with int 
   <anonymous> = 0]':
msg.cc:11:   instantiated from here
msg.cc:8: error: 'struct B<0>' has no member named 'i'

We try to access "A::i" which is a member of A and not
of B<0> in an illegal fashion. There are (at least)
two ways to make the code legal: a) make "i" static or b)
derive "B" from "A".

Compilers on the release branch at least give a hint w.r.t. b):

msg.cc: In member function `int B<<anonymous> >::foo() [with int 
   <anonymous> = 0]':
msg.cc:11:   instantiated from here
msg.cc:8: error: type `A' is not a base type for type `B<0>'

Although this is only correct in some cases, I rate the new
error message as a regression.

For related issues see PR 9443.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: