<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/78650>78650</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [profile] remove libclang_rt.profile's use of environment variable?
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          pirama-arumuga-nainar
      </td>
    </tr>
</table>

<pre>
    In https://github.com/llvm/llvm-project/blob/8649328060b4e748502d1d859f9c9c1bd3c2bccc/compiler-rt/lib/profile/InstrProfilingFile.c#L576, the profile runtime uses an environment variable to track and avoid re-initializing the profile file.  This breaks some tests (e.g. Android bionic and toybox) that actually test `getenv` and `setenv`.

If there is no strong reason for using the environment variable, can this instead be replaced with just a static variable?

(cc: @vedantk, @gulfemsavrun, @ZequanWu )
</pre>
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