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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - thinlto link failure"
href="https://llvm.org/bugs/show_bug.cgi?id=31027">31027</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>thinlto link failure
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.9
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>parag.warudkar@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Trying to build ZeroC ICE (<a href="https://zeroc.com/distributions/ice#source">https://zeroc.com/distributions/ice#source</a>) on
Ubuntu 14.04 using clang++-3.9.
/usr/bin/ld is symlinked to /usr/bin/ld.gold. The build fails in
<SRC>/cpp/src/slice2cs directory if -flto=thin is used.
clang++-3.9 -rdynamic -m64 -flto=thin -fvisibility=hidden -Wall -Werror
-pthread -fPIC -g -L../../lib/x86_64-linux-gnu -Wl,--disable-new-dtags
-Wl,-rpath,\$ORIGIN/../lib/x86_64-linux-gnu -o ../../bin/slice2cs Gen.o Main.o
-lSlice -lIceUtil
Gen.cpp:2996: error: undefined reference to
'Slice::Gen::TieVisitor::TieVisitor(IceUtilInternal::Output&)'
Gen.cpp:3003: error: undefined reference to
'Slice::Gen::ImplVisitor::ImplVisitor(IceUtilInternal::Output&)'
Gen.cpp:3010: error: undefined reference to
'Slice::Gen::ImplTieVisitor::ImplTieVisitor(IceUtilInternal::Output&)'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Replacing the -flto=thin with just -flto and keeping the same rest of the
command line the link succeeds. I am not sure however since normal LTO
succeeds, it looks like this is a bug with ThinLTO?
[ If anyone wants to reproduce this, ICE is easy to build with few dependencies
-mcpp, libssl-dev etc- and requires passing CXX=clang++-3.9 to make along with
modifying the Make.rules.Linux to treat clang++-3.9 as g++ and adding
-flto=thin to CXXFLAGS.]</pre>
</div>
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