<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/76597>76597</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-tidy]  disable `misc-unused-using-decls` check for C source
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang-tidy
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          zufuliu
      </td>
    </tr>
</table>

<pre>
    the check lacks:
```c++
bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
  return LangOpts.CPlusPlus;
}
```

numbers for https://github.com/zufuliu/notepad2/blob/main/src/Notepad2.c on a slow system:
```
===-------------------------------------------------------------------------===
 clang-tidy checks profiling
===-------------------------------------------------------------------------===
 Total Execution Time: 3.9062 seconds (3.8387 wall clock)

   ---User Time---   --System Time--   --User+System--   ---Wall Time---  --- Name ---
   0.5938 ( 17.7%)   0.0156 (  2.9%)   0.6094 ( 15.6%)   0.6067 ( 15.8%)  bugprone-reserved-identifier
   0.5625 ( 16.7%)   0.0312 (  5.7%) 0.5938 ( 15.2%)   0.4788 ( 12.5%)  misc-unused-using-decls
   0.2500 ( 7.4%)   0.0156 (  2.9%)   0.2656 (  6.8%)   0.2728 (  7.1%) readability-function-size
   0.1719 (  5.1%)   0.0781 ( 14.3%)   0.2500 ( 6.4%)   0.2006 (  5.2%)  readability-non-const-parameter
   0.1250 ( 3.7%)   0.0156 (  2.9%)   0.1406 (  3.6%)   0.1720 (  4.5%) misc-misleading-identifier
   0.0469 (  1.4%)   0.0156 (  2.9%)   0.0625 ( 1.6%)   0.1219 (  3.2%)  misc-non-copyable-objects
   0.0625 (  1.9%) 0.0000 (  0.0%)   0.0625 (  1.6%)   0.1173 (  3.1%) bugprone-unused-return-value
   0.1406 (  4.2%)   0.0156 (  2.9%)   0.1562 (  4.0%)   0.1134 (  3.0%) bugprone-suspicious-string-compare

```

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy8VUuP2zYQ_jX0haBADSXSOviQzdanIi2QtD1TFG2zS4kCH5tufn1BvVbeJsUeihqyLH4azvfNwxwZgrkOWp9Q_YDqx4NM8eb86Vu6JGvSoXXdyyneNFY3rZ6wleopIPYB0UdEPyBO50sheMjXhLbOWWzCz3K4JnnVv2sfjBs-p3F0PuoOwVG5IUScDX4Zo3FDwAj4sgwIGjwbuGftvek0RmJxjbHXMflh3RuKj7_aFPIXscUGicc36pbldB9S32of8MV5fItxnIKBM4Lz1cRbagvlegTnJXwE58FFPcoOEJxb61oE516aAcE5eIXg_Gl5XSjsBixxsO4rDi8h6v6faVqW7HG-yH_12TwuWVJWDlcSTfcyly3g0buLsWa4_l8SvrgoLf7pL61SrjD-YnqN2AfMioZywEErN3S57kdWHNlR4K_SWqysU08Imn3FMMaEkN-C9pMTQsiEfJ5yvEATkk0QPMwvFoz8kd1u-_Ltk-x1fti806Ju2DFLwaUoBII6t2DGaVnzCcdQNDuc06aa7euC3-FcrPhxxdt0Hb0bNPE6aP-sO2I6PURzMdrvNXCo5738XgMrYdZQb_hecV3AzroSxwWHol7x3gRF0pCC7kgKZriSTisbduRQUzptE0X1jviBrzh_jTPjAmZ2LIpywb2WnWyNNfGFXNKgcjeQYL7pHX0pymaNsdzzi2M5R1MVbM-zyuV3coFSvrrZkrLnH9xApqOFjNLLXse7CpRQz17Zu5qgrFY2dtcEpYDZDa62EkwV6E2wWnY5_9_tAFrxJQvlu6pAt46554c1mew1C5OAOfzxRbZWE9f-qVXcN8HmD5cbDy0oXXKdn7_H_pa-FGylX2u5_QWWJpwPcfIsbbprgy2j1V1T_7ACNYfVnt5JYNUqgb6VEFIYjTIuBRKiz8VQrh-l1_sz582JfehOrGtYIw_6VArKGgqlYIfbqQGpQEJ3OXbAtajKStS0aiSTTQ0dqIM5AQVWAqMUaMNY0VW0aY9lw4VqGJdHVFHdS2MLa5_7wvnrwYSQ9EnwuhEHK1ttwzSaAV5PdQSQR7U_5U2kTdeAKmpNiOHVTTTRTkN9t61-xLgzIdcfI05_dC5wukz7PCQ_4uCSV_qQvD39y8TMxMsPGb3LzYXgPAUTEJyneP4OAAD__6SFK9Y">