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    <p>Ashiq,</p>
    <p>I think that's the expected output, given that there was no
      segfault. I believe gdb will only print a stacktrace if it
      encounters a severe error like that. I'd recommend setting a
      breakpoint on the line where you call set_option and then check
      the current state of the relevant variables passed to the
      function.<br>
    </p>
    <p>Eric<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 11/11/2017 12:05 PM, Md Ashiqur
      Rahman wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAAbJvrFmvx_LXRVDHJ1zL2rZx=0+BJbqLhHJNoQ_SXoV85bf2g@mail.gmail.com">
      <div dir="ltr">Hello Alex,
        <div><br>
        </div>
        <div>I am working on a macOS VM. My unit test for NFD compiles
          correctly. However, I get a runtime error when running the
          test suit. So I wanted to check where the error occurs. I
          tried the following:</div>
        <div><br>
        </div>
        <div><b><font face="monospace, monospace">> sudo gdb
              build/unit-tests-daemon</font></b></div>
        <div><b><font face="monospace, monospace">> (gdb) r -t
              Face/TestMulticastUdpTransport</font></b></div>
        <div><br>
        </div>
        <div>This just runs through the test suit same as performing
          regular <font face="monospace, monospace"><b>./build/unit-tests-daemon
              -t Face/TestMulticastUdpTransport</b></font>. The error
          only shows an <b>unknown location:0:</b> and a "<b>Last
            Checkpoint</b>" of the test file which does not help at
          finding the exact line where the error occurs.</div>
        <div><br>
        </div>
        <div>The error message:</div>
        <div><br>
        </div>
        <div>
          <div><font face="monospace, monospace" color="#0000ff">unknown
              location:0: fatal error: in
"Face/TestMulticastUdpTransport/ReceiveMultipleRemoteEndpoints<nfd__face__tests__IpTransportFixture<nfd__face__tests__MulticastUdpTransportFixture,_(nfd__face__tests__AddressFamily)2,_(nfd__face__tests__AddressScope)2,_(nfd__face__tests__MulticastInterface)1>>":
boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error>
              >: set_option: Can't assign requested address</font></div>
          <div><font face="monospace, monospace" color="#0000ff">../tests/daemon/face/multicast-udp-transport.t.cpp:74:
              last checkpoint: "ReceiveMultipleRemoteEndpoints" entry.</font></div>
        </div>
        <div><br>
        </div>
        <div>Regards-</div>
        <div>Ashiq</div>
        <div><br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sat, Nov 11, 2017 at 9:55 AM, Alex
          Afanasyev <span dir="ltr"><<a href="mailto:aa@cs.fiu.edu"
              target="_blank" moz-do-not-send="true">aa@cs.fiu.edu</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Ashiq,<br>
            <br>
            Can you add a bit more details on what you are doing and
            what expecting?<br>
            <br>
            --<br>
            Alex<br>
            <div>
              <div class="h5"><br>
                > On Nov 10, 2017, at 8:31 PM, Md Ashiqur Rahman <<a
                  href="mailto:marahman@email.arizona.edu"
                  moz-do-not-send="true">marahman@email.arizona.edu</a>>
                wrote:<br>
                ><br>
                > Hello, I am trying to debug with gdb and lldb. I
                have made sure I have debug flag set in configuration.
                However, i am not getting the exact line number of code
                where the error is occuring. Would really appreciate if
                someone can help how I debug in nfd with gdb/lldb.<br>
                ><br>
                > Regards-<br>
                > Ashiq<br>
              </div>
            </div>
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            <br>
          </blockquote>
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