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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Segfault of __thread varaible in Linux/ARM due to bug of LLVM ARM code generation"
href="https://llvm.org/bugs/show_bug.cgi?id=27836">27836</a>
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<th>Summary</th>
<td>Segfault of __thread varaible in Linux/ARM due to bug of LLVM ARM code generation
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>leemgs@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=16399" name="attach_16399" title="ARM: don't attempt to merge litpools referencing different PC-anchors.">attachment 16399</a> <a href="attachment.cgi?id=16399&action=edit" title="ARM: don't attempt to merge litpools referencing different PC-anchors.">[details]</a></span>
ARM: don't attempt to merge litpools referencing different PC-anchors.
There are four thread local storage (TLS) models in Clang/LLVM as following:
1) global-dynamic TLS model
2) local-dynamic TLS model
3) local-exec TLS model
4) initial-exec TLS model
and emulated-TLS (for Android S/W platform)??
Even though, We can build run normally with the static relocation method by
selecting the initial-exec TLS model instead of global-dynamic TLS model (by
default) , We need to run the clang application code with global-dynamic (or
local-dynamic) TLS model in order that we support some applications is working
with dlopen(3) library call.
We have found the appropriate solution for some clang/LLVM applications
including 1) __thread variables and 2) -O2/-O3 of the clang language. Could you
apply this patch to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS repository?
* LLVM: Revision 268662 (ARM: don't attempt to merge litpools referencing
different PC-anchors.)
<a href="http://llvm.org/viewvc/llvm-project?view=revision&revision=268662">http://llvm.org/viewvc/llvm-project?view=revision&revision=268662</a>
Below is the mailing list discussed to fix this issue.
<a href="http://lists.llvm.org/pipermail/llvm-dev/2016-May/098974.html">http://lists.llvm.org/pipermail/llvm-dev/2016-May/098974.html</a>
<a href="http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160502/353476.html">http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160502/353476.html</a>
<a href="http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/355091.html">http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/355091.html</a>
<a href="http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356679.html">http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356679.html</a>
* Before r268662:
ubuntu@raspberrypi2#> ./corerun ./hello.exe (with -O2/-O3)
Segmentation Fault
* After r268662:
ubuntu@raspberrypi2#> ./corerun ./hello.exe (with -O2/-O3)
Hello!!! Welcome to .NET Core (CoreCLR) world.!!!</pre>
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