<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/76980>76980</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Internal linkage in Picolib
        </td>
    </tr>

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

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

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

<pre>
    At least since [C11](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf#%5B%7B%22num%22%3A429%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22XYZ%22%7D%2C-27%2C816%2Cnull%5D) "Any declaration of a library function shall have external linkage." This is important for C++20 modules. Named declarations with internal linkage can't be exported, which prevents using these declarations in the C++23 `std` and `std.compat` module.

Several declarations in Picolib have internal linkage, for `example static __inline int isblank(int c)`. See https://buildkite.com/llvm-project/libcxx-ci/builds/32428#018c9247-50ba-4728-b13d-fb064eba3707 for more issues. This prevents using this library in the C++ modules
</pre>
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