<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/145349>145349</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc] Tracking progress for adding hermetic testing on baremetal
        </td>
    </tr>

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

    <tr>
      <th>Assignees</th>
      <td>
            saturn691
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          saturn691
      </td>
    </tr>
</table>

<pre>
    Downstream (https://github.com/arm/arm-toolchain/), I have managed to hack together running hermetic testing of unit tests by LLVM.

```
❯ qemu-system-arm -M mps2-an500 -semihosting -nographic -device loader,file=libc/test/src/stdio/libc.test.src.stdio.printf_test.__hermetic__.__build__ -s -S
[==========] Running 1 test from 1 test suite.
[ RUN      ] LlvmLibcPrintfTest.PrintOut
A simple string with no conversions.
1234567890
1234 and more
[       OK ] LlvmLibcPrintfTest.PrintOut
Ran 1 tests.  PASS: 1  FAIL: 0
```

In an ideal world, I would like to contribute this upstream, where the embedded build is ran in the post-commit. In order to do this, I will have to do the following.

- [ ] Fix a few bugs with the testing on LLVM-libc
- [ ] Start the mutex implementation
- [ ] Upstream the LLVM-libc support libraries (https://github.com/arm/arm-toolchain/tree/arm-software/arm-software/embedded/llvmlibc-support) into `crt1` and `semihost`.
- [ ] Other things that I may have missed when integrating upstream.

</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJycVE2P2zYQ_TX0ZSBBoizZPvjgxDWw6KYb7Ca9GpQ4ktjlh0qO7Oy_L0jLi6YIgiICYZPD4RvOzOMTIajBIu5Z_YFxHgTN3ja7knHO6uNKzDQ6v383r1on3_ZHd7WBPAoDjG9Hoimw6sD4ifHToGic27xzhvGT8MtvRs7pbhTKJq8d4x_hAUZxQTDCigElkINRdK9AbkAa0YOfrVV2gBG9QVIdEAaKBtfDbBWldYD2DR4f__yUs-IQR1Msoziw3zjbHdnhBH-jmbPwFghNJryB7BOYKfBM2LooIAto1Ohu4Jl1gxfTqDrIJF5Uh6CdkOgZ_9grjaw6atV2jJ9ieMZPwcdFIKkc46e4l8edPPguT9Z88spSf07W8_mezvmcn8_trLQ8nyELkL3EK9cfWHX82aiP8LwUpkwVgN47c5-HWRHmNyB4_voHpC8eetQX86ja7nO6zJd4lzR9mokVhwMEZSaNEMhH6KuiEayDztkL-qCcDRG15NW6bjbbXbEsQFgJxnlcQt6-p9__R8hnYZdbhxzg8-HlhVUHKAFOh4fHOC3-287i8GBBWFAShYar81reeHR1s5ag1StGFnXOklftTAg0qgDzdONq9L2O6KMZAU2LUqKE1AJQAXyEtmlzcoGyzhmjKIcHC85L9BFbuoS5hFVa3zh830Hondbuquyw8DGDWJZYjZP6BgJ6vEI7D-FW4XjindU28ThL7Pr3wRcSnpKrmQm_QWqUQUuClLPfuX5dUk3e72gQ5mlynkCr1guvMPzSsyWPuJiD6-kq_A-W97LGp6AvJobPlvCM70BZcsCaovNUsqZI9GFNcX-ArCny7xJ6SkpAo7JDABoFwQMY8bYohwoBZexpbBzh4EWq5L3hEWol95XcVTuxwn25qYtmt-brcjXucd01Vdv3mwIFNuW2LTrZtd1OVnzTyc1mpfa84HXR8Kqs6w0v8-22KcpqW_G-34i-qdi6QCOUzmOiufPDSoUw475c19V6t9KiRR0WXb1JRpJUv4_-WSQBWxdaRf6_I5AinbQ4HaiP8MWL7jUmNXk3eAwBeudBSPljZbTQCo8GSejV7PX-J02OMZe_bPLuL-yimqUUAuOnJYvLnv8TAAD__5v8_Vs">