<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/80684>80684</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-tidy] Strict mode causes misleading redundant inline specifier warning
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

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

<pre>
     #73069 introduced a new warning [readability-redundant-inline-specifier](https://clang.llvm.org/extra/clang-tidy/checks/readability/redundant-inline-specifier.html). But when I try to fix the warnings in our project, when `Strict` is enabled, I'm getting compile issues by MSVC.

Following code is [compiling under MSVC](https://godbolt.org/z/6ajcMGWdP):

```cpp
namespace
{

class A
{
public:
  static inline const float test = 3.0F;
};

}

int main()
{
    A a;
    return 0;
};
```

But when I run clang-tidy over this code, via:
```sh
clang-tidy-18 -checks='readability-redundant-inline-specifier' -config='{CheckOptions: [{key: readability-redundant-inline-specifier.StrictMode, value: true}]}' test.cpp -- -std=c++17
```

I'm getting:
```
test.cpp:7:10: warning: variable 'test' has inline specifier but is implicitly inlined [readability-redundant-inline-specifier]
    7 |   static inline const float test = 3.0F;
      |          ^~~~~~
```

When I remove the `inline` Clang-Tidy is happy (also when I remove the anonymous namespace), but than MSVC complains:

```
example.cpp
<source>(7): error C2864: '`anonymous-namespace'::A::test': a static data member with an in-class initializer must have non-volatile const integral type or be specified as 'inline'
<source>(7): note: type is 'const float'
Compiler returned: 2
```

The documentation of the warning [C2864](https://learn.microsoft.com/en-us/cpp/error-messages/compiler-errors-2/compiler-error-c2864) explicitly show an example with a floating point type - I have no idea why `inline` is required for floating point types and not for integral types, but as they have explicitly mentioned it, there must be a reason.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJyUVk2P4jgQ_TXmUkoUHCBw4MDHsJrDaFfq0c7ZsQviacfO2g40c9jfvqokBHq6tzUTIcBOffnV87NFCPpkEddsvmXz_US0sXJ-_dTarRHyeVI6dV0D43mRZ4sVaBu9U61EBQIsXuAivNX2BGy-9SiUKLXR8Zp4VK1VwsZEW6MtJqFBqY8aPZvvGV9WMTaB5RvGD4wfpBH2lBpzrlPnT4wf8CV6cXuRRK2uNKhQPgfGDw-JutH_pUqrWBvGVyls2wiXCi18huivEB0c9QvECm_1B9AWXOuh8e47ysj4rndgi-wpei0jW2SgA6AVpUFF7z8zXtRwwhgJAOnqRhsEHUKLAcorfHn6e5eybM-yTf99cMa4S2-syJJQ6_1osrUKfef1HkYnp0pn4gDQD8YPC_Fdfvnjm_qL8RWZPWRii6z_yKbpZ6yoMTRC4mBQbB_tpREhwOand01bGi3H0AAhiqgl9DiDdDZEOBonIkQMEVi-hzzNDiy_BS_29__jzMNQ2wi10JbxJS3idXoAgA2IMQKNPcbWW8jeT3Fb9WOKh9b71sKdUeDO6CFWOnTtoI6etbgDeQsWqhGjwTOZLiEZ2JjvGS9-kfm8gEQ6e9Sn3o0V2x1F-bOJ2llqNRGCFdtnvNLg18KmPT-_3NYgTIvkHX2LhM58T9-86HqUyqaBJIEkRMXyvWR8y_h2WnwA4Cuav4WnH95is3xTsHwzzaiCYW_R37PwmjYOMF6QLdVTiXCj0rgYKNtIG0PXjdFSR3MdTNTvKcxImAJYsYPfpy50T-87PGz-6V96PsDq20A0rN0ZO31hi6zPSfqx6yj0lcinA1Siaa7A-FKY4EaO3l2FdfZauzbAffPyFfWYQIqVsJ1YdMpjhO4I9K4I9EN8EXVjMB0lgeW74FovkeWfGF8WvYwAeu887PhyMesYyQu2yMZakodaqNMs32z6n6Gt5CNucCsRBdRYl-jhomMFwoK2SS832uqohdE_0EPdhgiVOCNYZ5OzMyKSmPZ90jbiyQsD8dogOA_lnTEKRKAaB5B58eHarIv93qBAunN8oMLoveu13A9yg4p8-Ad9_1ohKCfbGi0t3Flwx8fjhcjbI_qOshsU3qa1lt4Fd4ypdDUdgTZp6bCjdvFD15SkxhDECbvpocSkexMS_mYukV1CvgJ8GTdTqNyFmjCQYWhKv3yqs3EkyR08CXy-dQS0QgGX6vqazjqAx39a7VHB0fn3ogQQVhHsncGrRoYbk0UgqK59sodaCUztaOvr7jyOFXrsmVIiCJLH4Gw6UetcrfKVmOB6WmTFdMbzVTGp1kIu1HS1nPFpzo_zpSxRlbNVLpeLArNVhhO95hmfZTybT2fTfMrT4zLDIlvkRaaKfJWXbJZhLbQZryaT7nRfL7PFcjYxokQTbhcnvyajpGxPgc0yo0MMd7eoo-muWA8XmvkeeuWGmm4DUrQBA9Q6GBSKUBwV7q1KDrSatN6sf7om6Fi15cAhyj_8JOPF5tDfUBg_dMv4LwAA__-xfCXf">