<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/82867>82867</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clangd] the IWYU pragma seems not work on macOS
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          zhang-stephen
      </td>
    </tr>
</table>

<pre>
    as title said, reproduce it with following steps:


1. create `.clangd` configuration as following:
```yml
---
CompileFlags:
  Remove: [-m*, -W*, -std=gnu*]
  CompilationDatabase: build/

---
If:
  PathMatch: .*\.[ch]{1}

CompileFlags:
  Add: [-xc, -std=c11]
  Remove: [-xc++]
  Compiler: clang

Diagnostics:
  UnusedIncludes: Strict
  MissingIncludes: Strict
```
2. create `dummy.h`, its content:
```c
//dummy.h
#ifndef __DUMMY_H
#define __DUMMY_H

typedef enum {
    RED, GREEN, BLUE
} Colors;

#endif // __DUMMY_H
```

3. create `foo.h`, just include the `dummy.h`, nothing else to do
4. then clangd will raise a warning named as `unused-includes`, and this is expected
5. add IWYU directive in `foo.h`, it looks like:
```c
// foo.h
#include "dummy.h" // IWYU pragma: keep
```
6. on windows, the warning of `unused-includes` would be suppressed, but on macOS, it **CANNOT** be suppressed. there is a screenshot for similiar scenario:



Environment:
LLVM: 17.0.6
Windows: Windows 11 x64 23H2
MacOS: MacOS 14.3 Apple Silicon


</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyUVdtu2zgQ_Rr6ZSBBom72gx98ibcF6nbRbjboU0CJI4kNRQokFSf79QtKtqNcisUCBj3icGbOnMMLs1Y0CnFNsi3J9gs2uFab9T8tU01gHfYtqkWp-fOaWXDCSQTLBCd0BwZ7o_lQIQgHJ-FaqLWU-iRUAz7SkmRDoj2JXo1xCJVB5hBIHoWVZKrhJI-g0qoWzWCYE1oBsy_JXtLk0fR77uQ0EwTBZOx01wuJB8mal7IA37HTj0iSDZBsG3SEbjzw4O5iWMdJsm_U4Cey_SVsyjYi2TPHSmbHHOUgJCf0MG_niuBzPav7J3Ptkbmq9WHhmHwXkmxbtb5KsY1JsZ9n-Q38DecX7E_VDHAVxzO0r5v0C7f-97YdNH7JSPi89F6wRmnrRDWvfKsGi_yzquTA0TvghzOichf_UVgrVPO7BVelpk8615wPXfcctt5JdyCc9dI7VO69ztX5mx4IPVzizlOJqBXHGu7v97fH48_7T1cHx1oofOcYR_fco49CNXRAiu2lH4DvN3uP54_vNzdfvbH9cntzjiz2sNNSG0uS7asNTRNUXNQwAXxX8TUJ05jMqai1vhLxa7AOxMQnuPYDqpR2rT9bKC2C08D1lDIN_Xo1ScvhJKQEw4RFYHBiRvkYxTrk_lSRPBpGbQNx0W7KzhQH1woLwgI-9Vg55FP-LATGOXy--3kLXBisnHhEEOptB8KB1PrBghQP-B9iwhR41fLcN6H00jOlF1rHwr1hTcf8PntA7D8kOA9BKzgJxfXJekCexQsBuv64dTjpQXIoEezQ9watxfFyKwfns3Ws-vbj3Nx4aWx2m69fv_012a_DRhkMegIZ2MogKttqB7U2YEUnpGAGbIWKGaHf3o00JtlWdKxBf3DpsnVuukBHDhrh2qEMK90RepDy8fIX9Eb_wsoRemDWorOEHuIioXkRLwk9VIzyuFyVwTJfZUGaUh6sinQVZKtlniQ04nEREbp6f0nfqEdhtOrmp_LLl7-Pnv-4CKMwn-buzmQnGzibEMfwlKdAk090WnMcKUw2MBoQp2ECm76XCD-EFJVW88ILvk74KlmxBa7jIloWWREv40W7LnnCOKNpVtA6XRUJj_mqKFlZ5Mu6iDBaiDWNaBpRmkZ5mtM4LBlf8TqPEk4pxrgkaYQdEzL0xIXaNAth7YDrJV3mxUKyEqUdX0FKFZ5gdBJK_aNo1iPZ5dBYkkZSWGdfsoyPog88v2XZftx4s10LFrGz_vzCSZuH675aDEau_7fQIzAv9Aj83wAAAP__HNtEdQ">