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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - "mcount" is deprecated for arm backend" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23969&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=TOIltV9P2D9Jbd7kDewJGsQLYYbo1OkFWrXI0XCU_7w&s=bhk1AL8nNgDL9v4uwkbY1ZLskQ4npaLPfVXpkon1bgc&e=">23969</a>
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<th>Summary</th>
<td>"mcount" is deprecated for arm backend
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>shenhan@google.com
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<th>CC</th>
<td>echristo@gmail.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Current ARM bpapi (Base Platform Application Binary Interface) no longer uses
"mcount" as function profiler name, instead it uses "__gnu_mcount_nc".
(Refer to trunk gcc - gcc/config/arm/bpapi.h ARM_FUNCTION_PROFILER.)
Also checking the system libc.so, __gnu_mcount_nc is properly defined.
Notwithstanding the fact that "_mcount" and "mcount" are defined in libc.so,
they are not the default-version symbol, to link against these symbols, a
version script file has to be provided to the linker, otherwise we get an
undefined symbol error.
May I suggest override this value in ARMTaretInfo as -
this->MCountName = "__gnu_mcount_nc";</pre>
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