<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/98906>98906</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Regression in "cstdlib" file
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          mouse07410
      </td>
    </tr>
</table>

<pre>
    I think this patch is explanatory:

```diff
diff -uw /opt/local/libexec/gcc14/libc++/include/c++/v1/cstdlib.orig /opt/local/libexec/gcc14/libc++/include/c++/v1/cstdlib
--- /opt/local/libexec/gcc14/libc++/include/c++/v1/cstdlib.orig 2024-07-09 13:43:11
+++ /opt/local/libexec/gcc14/libc++/include/c++/v1/cstdlib      2024-07-10 09:41:58
@@ -142,7 +142,7 @@
 using ::mbstowcs _LIBCPP_USING_IF_EXISTS;
 using ::wcstombs _LIBCPP_USING_IF_EXISTS;
 #endif
-#if !defined(_LIBCPP_CXX03_LANG)
+#if !defined(_LIBCPP_CXX03_LANG) && defined(_LIBCPP_HAS_QUICK_EXIT)
 using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
 using ::quick_exit _LIBCPP_USING_IF_EXISTS;
 #endif
```

Basically,  check for `_LIBCPP_HAS_QUICK_EXIT` was lost, and that broke GCC `-stdlib=libc++`.
</pre>
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