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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [PATCH] Make mcount function names match gcc on arm and arm64 Linux"
href="https://llvm.org/bugs/show_bug.cgi?id=27248">27248</a>
</td>
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<th>Summary</th>
<td>[PATCH] Make mcount function names match gcc on arm and arm64 Linux
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.8
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bero@linaro.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16175" name="attach_16175" title="Adjust mcount name to match gcc">attachment 16175</a> <a href="attachment.cgi?id=16175&action=edit" title="Adjust mcount name to match gcc">[details]</a></span>
Adjust mcount name to match gcc
Currently, clang names the mcount function from -pg "_mcount" on PPC Linux and
"mcount" on any other Linux.
In gcc, this matches the behavior on PPC and x86 (both 32 and 64); but on
aarch64 the function is called "_mcount" and on arm32 it's called
"__gnu_mcount_nc".
This mismatch in naming causes the Linux kernel to miscompile for arm (32 and
64) if CONFIG_FUNCTION_TRACER is enabled.
The attached patch fixes this by matching the expected name of the mcount
function.</pre>
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