<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/103972>103972</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            NS_PER_
        </td>
    </tr>

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

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

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

<pre>
    Looks like clang 19 leaks these into public **C** namespace:

```c
 // POSIX implementation using clock_gettime where available.  The clock_gettime
 // result is in nanoseconds, which is converted as necessary to
 //  - deciseconds for kind 1
 //  - milliseconds for kinds 2, 4
 //  - nanoseconds for kinds 8, 16
 constexpr unsigned_count_t DS_PER_SEC{10u};
 constexpr unsigned_count_t MS_PER_SEC{1'000u};
 constexpr unsigned_count_t NS_PER_SEC{1'000'000'000u};
```

(from https://github.com/llvm/llvm-project/pull/96652)

Is this something you intended to do?  It breaks our builds and I am guessing we are not the people on the earth who already defined these generic values - perhaps those internal to the compiler need to be prefixed with `__`?
</pre>
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