<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/142112>142112</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-tidy] misc-confusable-identifiers ignores -header-filter option
        </td>
    </tr>

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

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

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

<pre>
    When using the clang tidy check **misc-confusable-identifiers** the option -header-filter is ignored. The warnings from the files not matching the header-filter are always displayed and not suppressed. This works perfectly for the check **google-explicit-constructor** shown by the example below.

**Ubuntu LLVM version 18.1.3**

The problem can be reproduced by the following example:

main.cpp:
```
#include "header1.h"

namespace AI{
  const int val = 10;
}

int main(int c, char** v)
{
    return 0;
}
```

header1.h:

```
class A { A(int); };

namespace A1
{
void printi();
}
```

Output from clang-tidy with misc-confusable-identifiers:
```
clang-tidy-18 -checks='-*,misc-confusable-identifiers' -header-filter='ignore_all' main.cpp -p=../build/

1 warning generated.
/home/...../example/main/main.cpp:3:11: warning: 'AI' is confusable with 'A1' [misc-confusable-identifiers]
    3 | namespace AI{
      |           ^
/home/...../example/main/header1.h:3:11: note: other declaration found here
    3 | namespace A1
      | ^
```

Output from clang-tidy with google-explicit-constructor:
```
clang-tidy-18 -checks='-*,google-explicit-constructor' -header-filter='ignore_all' m
ain.cpp -p=../build/

1 warning generated.
Suppressed 1 warnings (1 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
```

</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJycVVGvozgP_TXpiwUioZT2gQfu9EMaaT7tw-7sPq5CYkp2QoKS0E7__SpAp7139lZXgyoVYR_bxzmxuffqZBArUryQ4rjhU-itq2wIg960Vl6rv3o0MHllThB6BKF5fFPyCqJH8Q0IqwmrB-VFIqzpJs9bjYmSaILqFDq_OMxgOwZlDSQ9coku6ZQO6EB5UCdjHcoU_ugRLtwZZU4eOmeHGdcpjR6MDTDwIPpbLa_DcIfA9YVfPUjlR82vKIEbOeP8NI4OvV9yKA8X6755GNF1KIK-Qmfdwu-B1Mnak8YEv49aCRUiPx_cJIJ1Kynf24uB9jpD8TsfRo3QoraXlGR1_M1-X9vJhAm-fPnz_3BG52MT6D6lab7YF9_IfXS21TiA4AZaBIejs3ISKG9JOqu1vcQOrOlIvsIHrkwqxnH9sMvWXywiV0boSSIQxpau0bQnjC1Iwwf0IxcI9WdSvpCsBpi5gjIBzlwDyY9AM5JHGymPCywaY1LC9vFVEPYJRM9vvTkTdpjdl4AADsPkDLwO81hmVt9ru7F6dBCaew81kPIF6iVrzJG_QAy2RH3Fhv7If7ZKwuiUCYqw_YJ6r4jfpjBOYVHfLPdklvtFhR6e6fynvt_BCd1DMkvLk_xIWJnMTfr09NqUby7Kglyuyt9c6-hxO3RIRpIf05Swpp2UloQ1Cxl6u05wQoOOB5SzNFnT2wEJa9L4ENbc5MSa5UybBz3lJK8pJXl9CxZfCSvrz7EG5eFOYWlTtNFoI8XLM47FcdVGDqT8BP8lxPhE2_0hxf8-xuBRTXcKxoZ4acCGHh1IFJo7Ps-lzk5GQo8O36uKvippLeTj6nk2UH5BPU_n04fUQ7L6FwX0-4-BCvQ-sQnbU1AGjDXJ5NGBsBIJO0TEV48_l5TOq8HeJjagc9atk59rPQfyVx9wWKe9T2EOtHxc4_n3QryGAvdwQa3TN53eyCqXh_zAN1jRcrsvDju6zTZ9xXhGKdsXDDliJ-mu3LUZL7dcZG3b8XyjKpaxIivyLDtk--KQHvL9Nt_R7iAlbXclI9sMB650qvV5SK07bZT3E1Z0yyhlG81b1H5evozdDzxO5uK4cVVEJe108mSbaeWDv8cJKuh5bT_AiuOzAbVuWf92_y5beTM5XfUhjPMgYw1hzUmFfmpTYQfCmph4_UtGZ_9BEQhrZjaesGYldK7YvwEAAP__6qadRw">