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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - error in backend: assembler label L?xxx$parent_frame_offset can not be undefined (MSVC, SEH-related)"
href="https://llvm.org/bugs/show_bug.cgi?id=30431">30431</a>
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<th>Summary</th>
<td>error in backend: assembler label L?xxx$parent_frame_offset can not be undefined (MSVC, SEH-related)
</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>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>reupenllvm@forward.cat
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>While compiling my source tree under LLVM-4.0.0-r281648-win64.exe and MSVC
2015, the following compilation error happens for debug builds:
CL : fatal error : error in backend: assembler label
'L?query_cpu_feature_set@pfc@@YA_NI@Z$parent_frame_offset' can not be undefined
[F:\foobar2000\columns_ui\pfc\pfc.vcxproj]
This does not happen in release builds. This happens in previous versions of
LLVM/Clang too.
To reproduce, open a VS2015 x86 Native Tools command prompt and run:
git clone --recursive <a href="https://github.com/reupen/columns_ui.git">https://github.com/reupen/columns_ui.git</a>
cd columns_ui
msbuild /m /p:PlatformToolset=LLVM-vs2014 /p:Platform=Win32
/p:Configuration=Debug /t:Rebuild vc14\columns_ui-public.sln
The problematic function is defined here:
<a href="https://github.com/reupen/pfc/blob/07bdb04d9eef8a03fada2c3ee6f364039cb4a1b5/cpuid.cpp#L7">https://github.com/reupen/pfc/blob/07bdb04d9eef8a03fada2c3ee6f364039cb4a1b5/cpuid.cpp#L7</a>
Removing the usage of SEH makes the problem go away. Release builds also work.</pre>
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