From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-prs-return-31629-listarch-gcc-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 30902 invoked by alias); 21 Mar 2003 00:36:01 -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 30881 invoked by uid 71); 21 Mar 2003 00:36:00 -0000
Resent-Date: 21 Mar 2003 00:36:00 -0000
Resent-Message-ID: <20030321003600.30879.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, bobsummerwill@ea.com
Received: (qmail 27237 invoked by uid 48); 21 Mar 2003 00:32:06 -0000
Message-Id: <20030321003206.27236.qmail@sources.redhat.com>
Date: Fri, 21 Mar 2003 00:36:00 -0000
From: bobsummerwill@ea.com
Reply-To: bobsummerwill@ea.com
To: gcc-gnats@gcc.gnu.org
X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31)
Subject: c++/10175: -Wunreachable-code appears broken for one-line blocks.
X-SW-Source: 2003-03/txt/msg01359.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10175
>Category:       c++
>Synopsis:       -Wunreachable-code appears broken for one-line blocks.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 21 00:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Bob Summerwill, Electronic Arts, Inc.
>Release:        gcc version 3.2 (mingw special 20020817-1)
>Organization:
>Environment:
MinGW
>Description:
The -Wunreachable-code warning doesn't appear to work correctly for single-statement blocks.  I've replicate this behaviour on MinGW, Cygwin, and a colleague has verified it against the CVS head revision on Linux.
>How-To-Repeat:
Just compile the attached .ii file using MinGW-2.0.0.3, like so:

D:\>gcc -v
Reading specs from D:/FIFA/packages/MinGW/2.0.0.3/bin/../lib/gcc-lib/mingw32/3.2
/specs
Configured with: ../gcc/configure --with-gcc --with-gnu-ld --with-gnu-as --host=
mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable
-languages=f77,c++,objc,ada --disable-win32-registry --disable-shared
Thread model: win32
gcc version 3.2 (mingw special 20020817-1)

D:\>gcc -Wunreachable-code Unreachable.ii
Unreachable.cpp: In function `int main()':
Unreachable.cpp:12: warning: will never be executed

A warning is only issued for one the three unreachable statements.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="Unreachable.ii"
Content-Disposition: inline; filename="Unreachable.ii"

# 1 "Unreachable.cpp"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "Unreachable.cpp"
int main(void)
{
    int value = 0;

    if (0)
        value = 0;
    else
        value = 1;

    if (0) {
        value = 0;
        value = 0;
    } else {
        value = 1;
        value = 1;
    }

    return 0;
}