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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Undefined references with -fsanitize=undefined (vptr)"
href="http://llvm.org/bugs/show_bug.cgi?id=22268">22268</a>
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<th>Summary</th>
<td>Undefined references with -fsanitize=undefined (vptr)
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.5
</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>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>oliverst@online.de
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>When trying to link a project, that uses several libraries (static and
dynamic), that were compiled with -fsanitize=undefined it might fail with
undefined references. Shuffling around the order of the libraries fixes some of
them, but causes others. So I guess using the library grouping for the linker
might be a wrokaround.
It appears to be related to the vptr sanitizer since using
-fsanitize=array-bounds,bool,enum,float-cast-overflow,float-divide-by-zero,integer-divide-by-zero,null,object-size,return,shift,signed-integer-overflow,unreachable,vla-bound
work fine, but if I add "vptr" to the list the linking fails. The list is
bascially everything in "undefined" sans "vptr", "null" and "object-size". I am
using clang++ as the linker.
Unfortunately there's too much code involved to get this reduced easily, but I
reckon, that it should be reproducible with other projects.
I am using the official 3.5 binaries on ubuntu 14.10.
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
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