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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - driOpenDriver uses RTLD_GLOBAL and breaks clang's libc++"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108669">108669</a>
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<th>Summary</th>
<td>driOpenDriver uses RTLD_GLOBAL and breaks clang's libc++
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>18.0
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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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>medium
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<th>Component</th>
<td>Mesa core
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>stsp@list.ru
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<pre>driOpenDriver() does this:
handle = dlopen(realDriverName, RTLD_NOW | RTLD_GLOBAL)
When "realDriveName" == "radeonsi", we get libstdc++
loaded, because:
$ ldd /usr/lib64/dri/radeonsi_dri.so | grep libstdc++
libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007f2b2ee30000)
So this dri driver is linked with libstdc++.
RTLD_GLOBAL makes a problem when the main program
or some other lib is built with clang's libc++.
There happens to be a mix of symbols with same name,
and an imminent, hard to debug crash.
Please use RTLD_LOCAL to avoid the problem.
I've found this patch:
<a href="https://lists.freedesktop.org/archives/mesa-commit/2014-June/050035.html">https://lists.freedesktop.org/archives/mesa-commit/2014-June/050035.html</a>
which reverts to RTLD_GLOBAL in 3 places.
The problem is described here:
<a href="https://lists.freedesktop.org/archives/mesa-dev/2014-May/060441.html">https://lists.freedesktop.org/archives/mesa-dev/2014-May/060441.html</a>
Based on that description, I think it was enough
to use RTLD_GLOBAL only for "libGL.so.1", leaving
other places with RTLD_LOCAL.</pre>
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