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[lwip-devel] [bug #53789] Two "statement is unreachable" warning in ip6.


From: hongchengyan
Subject: [lwip-devel] [bug #53789] Two "statement is unreachable" warning in ip6.c and icmp6.c.
Date: Sun, 29 Apr 2018 22:52:42 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

URL:
  <http://savannah.nongnu.org/bugs/?53789>

                 Summary: Two "statement is unreachable" warning in ip6.c and
icmp6.c.
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: yanhc
            Submitted on: Mon 30 Apr 2018 02:52:40 AM UTC
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Compiler Warning
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.2

    _______________________________________________________

Details:

In my MDK-ARM IDE, line 718 of ip6.c and line 121 of icmp6.c will cause the
following warning:
\lwip-2.0.2\src\core\ipv6\icmp6.c(121): warning:  #111-D: statement is
unreachable.

The ip6.c is as follows, the break is unreachable after goto:
    default:
      goto options_done;
      break;

The icmp6.c is as follows, the break is unreachable after retrn:
    return;
    break;

I have checked latest 2.0.3, the issue is still there.




    _______________________________________________________

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