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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - libunwind left-shifts negative number"
href="https://bugs.llvm.org/show_bug.cgi?id=33358">33358</a>
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<th>Summary</th>
<td>libunwind left-shifts negative number
</td>
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<th>Product</th>
<td>libc++abi
</td>
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<th>Version</th>
<td>unspecified
</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
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>liuw@liuw.name
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<p>
<div>
<pre>While building the rumprun project, which contains a copy of NetBSD source
code, which contains a copy of LLVM libunwind, I encountered the following
error with gcc 6.3 on Debian Stretch.
/local/work/Rump-kernels/rumprun/src-netbsd/sys/lib/libunwind/AddressSpace.hpp:
In member function '__int64_t _Unwind::LocalAddressSpace::getSLEB128(_Unwind::
LocalAddressSpace::pint_t&, _Unwind::LocalAddressSpace::pint_t)':
/local/work/Rump-kernels/rumprun/src-netbsd/sys/lib/libunwind/AddressSpace.hpp:143:27:
error: left shift of negative value [-Werror=shift-negative-value]
result |= (-1LL) << bit;
^~~
cc1plus: all warnings being treated as errors
*** Failed target: libunwind.o</pre>
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