<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/139902>139902</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [compiler-rt][XRay] xray_interface.h not C compliant
        </td>
    </tr>

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

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

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

<pre>
    Heya 👋 

We're currently looking into integrating a prototype developed by @sebastiankreutzer and @pauladelmann, which enables the usage of XRay for compiler instrumentation in the performance measurement infrastructure [Score-P](https://www.vi-hps.org/projects/score-p). The prototype so far uses C++, but we are looking to port it to C, as this prevents some issues we might run into down the line. A lot of work in that direction is already done, but we noticed an issue with `xray_interface.h`.

`xray_interface.h` includes two headers:

https://github.com/llvm/llvm-project/blob/7e7871d3f58b9da72ca180fcd7f0d2da3f92ec4a/compiler-rt/include/xray/xray_interface.h#L17-L18

Both headers are C++ heades, not compatible with C. A bit further down, we see `std::size_t` being used:

https://github.com/llvm/llvm-project/blob/7e7871d3f58b9da72ca180fcd7f0d2da3f92ec4a/compiler-rt/include/xray/xray_interface.h#L71

These issues seem to exist since XRay was introduced. Probably no tool tried to use this with C...
Fixing this should be straight-forward, replacing `#include <cstddef>` with `#include <stddef.h>`, `#include <cstdint>` with `#include <stdint.h>` and `std::size_t` with `size_t`.
But maybe we want to introduce a test to make sure that this header stays C compliant?
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzMlcGOpDgPx58mdbEKQSgaONShq_pD32EOo92Rdm8jQ0yR7ZCgxDTDPP0qUNU7s2pptbeVWk3J2Mb---cEQ9A3S3QWxUUULweceXD-_GVYPR1ap9bz_2lFEE0q6kbUmaguINJnkT7_RkKWnqCbvSfLZgXj3Ku2N9CWXfxHN48cDQiTd-x4nQgUvZFxEyloVxCnNFCLgTXaV08zfycPaFV8MeFsUJEZ0Vohr7AMuhuALLaGAvBAMAe8Ebgefv8FV-idh86NkzbkQdvAfh7JMrJ2FrTdIibyvfMj2o5gJAyzp-gD2vYeY0THsycQxeXXznk6fhbFi5DVwDwFkT8L2QjZLMuSvOnjMIXE-ZuQzeTdH9RxELIJW9gkZJ3Al_jB976Dgx49zIECXIW8bH9XaGeGhQA9vcvHDibnGTTHn9fohbFhHWDy9EaWAwQ3EugQZgoxfNS3gcHPdtdeuWXv12hLCTyDcRx1Wpx_3aVABqU9dbs4AdB4QrWCcpZ-KMs61h0pQLt_DBbNA4in9JvH9Wscse-xo2QQT2myY_HxS9C2M7OKg1scDISK_KboFvOzvjfNw9wmnRuFbIx5ezyOd52FbFrjWiGbksqqzFTeF1VbKyxlh1mV9p0q-1RJhXlfS-pOKGTzIOPoY_y9GiGbWOv98VPJMv-UlcdPWbVXeHE8PMrehnUf4W4LUTLreOMPWbfmrtQ1it9qhn72PJDfJrPBTBCIopKBVew8fw76O33lqFVLEYM5kPqPK1Rme3VfBgrvOAaiMYJL33RgCDru2ragC4aIp3dq7kgl8Nm7FluzgnXAzhlgr0nF0DnQzvtdxCSy1ehv23ZEexjcbBS0BIE9RviPvfMLehXF9TQZ7KKzeEqFzO-9gMivXWClqBf5_6LQD5p_9tldkmF3igk_TKMt_1MabfmRZj_VPhz3I_zdEru9zAwjri1FVBa021nwrh4gMIXNNuIrQTzI9q3e5NlBhcC4BrhuVBqNsd7moM65qvMaD3TOylMp80ymT4fhXBVVmZOqilZSlXVVVqZpjbJu60xmZYUHfZapLNIiO2WnNE2LJMtTqtO6SLuiQ1mSOKU0ojZJRDEejYeNiHOW13UqDwZbMmG7Z6S0tOy8CCnjtePPG7_tfAvilBodOPyVhjWb7YL6EdHiRRSXyJUoXuDvcG7L-EPjh9mb87_eoR1oIZt7B29n-WcAAAD__7DGYT0">