<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - -Wshadow doesn't warn when shadowing symbol from anonymous or outer namespace"
   href="https://bugs.llvm.org/show_bug.cgi?id=45260">45260</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wshadow doesn't warn when shadowing symbol from anonymous or outer namespace
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>-New Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>hans@chromium.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>For example:

$ cat /tmp/a.cc
namespace {
constexpr int foo = 42;
}

namespace ns {
int f() {
  constexpr int foo = 42;
  return foo;
}
}
$ bin/clang -c -Wshadow /tmp/a.cc
(no warning)

There's also no warning if the first 'foo' is at file-scope (i.e. without any
namespace). However, if the first 'foo' is put in 'namespace ns', then it does
warn.

Is there a reason it doesn't warn in the first two cases? It still seems like a
case of shadowing to me.</pre>
        </div>
      </p>


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