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    <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   title="NEW - fatal error: module file 'path/to/A-xxx.pcm' is out of date and needs to be rebuilt: signature mismatch"
   href="https://bugs.llvm.org/show_bug.cgi?id=52268">52268</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>fatal error: module file 'path/to/A-xxx.pcm' is out of date and needs to be rebuilt: signature mismatch
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>All
          </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>-New Bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>sunbohong@gmail.com
          </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>Created <span class=""><a href="attachment.cgi?id=25383" name="attach_25383" title="demo">attachment 25383</a> <a href="attachment.cgi?id=25383&action=edit" title="demo">[details]</a></span>
demo

Clang will build an unstable `xxx.pcm`, and it will lead to compilation errors
`is out of date and needs to be rebuilt: signature mismatch`

Here is an example: <a href="https://github.com/sunbohong/clang-module-sign-demo">https://github.com/sunbohong/clang-module-sign-demo</a>


```
fatal error: module file 'path/A-9AU2GFRR1U5N.pcm' is out of date and needs to
be rebuilt: signature mismatch
note: imported by module 'B' in 'path/B-25F7JY52UVDQX.pcm'
note: imported by 'path/clang-module-sign-demo/tmp/c.pch.gch'
1 error generated.
````</pre>
        </div>
      </p>


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