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    <head>
      <base href="https://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Marcos are treated as user-defined literals and are not expanded"
   href="https://llvm.org/bugs/show_bug.cgi?id=24361">24361</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Marcos are treated as user-defined literals and are not expanded
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.6
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>C++11
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>dieselmachine@mail.ru
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>If you try to compile this code with -std=c++11, __DATE__ and __TIME__ macros
will be treated as user-defined literals. These macros are expanded correctly
for older standard.

const char* s = "Build "__DATE__" at "__TIME__" ";

Also note this comment in clang/lib/Lex/Lexer.cpp, line 1657. Why ud-suffix
takes precedence over macro? Macro should be expanded first.

// them. We assume a suffix beginning with a UCN or UTF-8 character is more
// likely to be a ud-suffix than a macro, however, and accept that.</pre>
        </div>
      </p>
      <hr>
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