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    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - clang-cl: Disable trigraphs by default"
   href="http://llvm.org/bugs/show_bug.cgi?id=21974">21974</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang-cl: Disable trigraphs by default
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>nicolasweber@gmx.de
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre><a href="http://msdn.microsoft.com/en-us/library/ee462497.aspx">http://msdn.microsoft.com/en-us/library/ee462497.aspx</a>

"When /Zc:trigraphs is specified, the compiler replaces a trigraph character
sequence by using a corresponding punctuation character. To turn off trigraph
substitution, specify /Zc:trigraphs-. By default, /Zc:trigraphs is off."

Yet:
<a href="http://build.chromium.org/p/chromium.fyi/builders/CrWinClang/builds/912/steps/compile/logs/stdio">http://build.chromium.org/p/chromium.fyi/builders/CrWinClang/builds/912/steps/compile/logs/stdio</a>

..\..\sandbox\win\src\win_utils_unittest.cc(103,18) :  warning(clang): trigraph
converted to '\' character [-Wtrigraphs]
  pipe_name = L"/??/pipe/mypipe";
                 ^

Looks like it's not off by default in clang-cl. It should be.</pre>
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