<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 - Inconsistent output when running clang-format twice"
   href="https://bugs.llvm.org/show_bug.cgi?id=42509">42509</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Inconsistent output when running clang-format twice
          </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>Keywords</th>
          <td>beginner
          </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>tomasz.g.markiewicz@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>djasper@google.com, klimek@google.com, llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Single runs and double runs of the `clang-format' are not consistent between
themselves. See the example below.

file: example.cc:
--------------------------
void foo() {
    /* Empty */
}

Single run
----------------------------
$ style=LLVM; cat example.cc | clang-format --style=${style}

Result:
void foo() { /* Empty */ }


Double run
----------------------------
$ style=LLVM; cat example.cc | clang-format --style=${style} | clang-format
--style=${style}

Result:
void foo() { /* Empty */
}

The same is for style=Google.

Mozilla, Chromium and WebKit styles (obviously) work fine. (These probably do
not merge an empty function into one line.)

Version:
----------------
$ clang-format --version
clang-format version 9.0.0 (<a href="https://github.com/llvm-mirror/clang.git">https://github.com/llvm-mirror/clang.git</a>
b5cfeee0a6e73044cc755e2ab08145056b2d3fd4)
(<a href="https://github.com/llvm-mirror/llvm.git">https://github.com/llvm-mirror/llvm.git</a>
57b4161e8fc497386cebf223cb8a26896303cb05)</pre>
        </div>
      </p>


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