<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/94284>94284</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm-clang-win-x-{armv7l,aarch64}-release: migrate away from DEFAULT_SYSROOT
        </td>
    </tr>

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

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

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

<pre>
    The CMake variable `DEFAULT_SYSROOT` provides a default `--sysroot=` for every `clang --target=xxx`.

Within the `clang/test/Driver` testsuite, there have been many changes tha adjust `--sysroot=` so that
these tests will pass on build bots that specify `DEFAULT_SYSROOT`.
Like the now-deprecated `GCC_INSTALL_PREFIX`, this places undue maintenance burden to keep `clang/test/Driver` tests pass for all supported bots.
Two changes should happen:

* There should be no expectation that all tests will pass.
* `DEFAULT_SYSROOT` should eventually be deprecated and then removed. (After we figure out a way to support relative paths https://reviews.llvm.org/D158218)

As alternatives, llvm-clang-win-x-{armv7l,aarch64}-release may switch a Clang configuration file.

* https://clang.llvm.org/docs/UsersManual.html#configuration-files
* https://blogs.gentoo.org/mgorny/2022/10/07/clang-in-gentoo-now-sets-default-runtimes-via-config-file

In short, place `bin/$default_triple.cfg` beside `bin/clang`.

</pre>
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