<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 - Feature request: Add capability to emulate earlier versions"
   href="https://bugs.llvm.org/show_bug.cgi?id=45465">45465</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Feature request: Add capability to emulate earlier versions
          </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>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>Formatter
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>jonas@lippuner.ca
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>As you know, the formatting produced by different versions of clang-format is
not entirely consistent. So if you use clang-format-9 to format some code, the
result will the slightly different than if you use clang-format-8 even if the
config file is exactly the same.

This is causing some issues for our collaboration since different developers
have different version of clang-format installed and available on their various
Linux distros.

It would be great if a later version of clang-format was able to emulate the
formatting of a previous version. For example, if the project decides to use
clang-format-8, those people who have clang-format-9 could just pass a flag to
clang-format-9 that tells it to format the code like clang-format-8 used to do
it.

I know this may be non-trivial to implement, but I think there would a number
of collaborative coding projects that would benefit from this feature.</pre>
        </div>
      </p>


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