[tor-bugs] #20866 [Applications/Tor Browser]: OpenGL software rendering is broken on certain Linux systems.

[Tor Bug Tracker & Wiki]

#20866: OpenGL software rendering is broken on certain Linux systems.
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     Reporter:  yawning                   |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Software rendering with modern Mesa uses
 [http://www.mesa3d.org/llvmpipe.html llvmpipe], and thus depends on
 `libLLVM`.

 Depending on which version of the `libstdc++` the system's `libLLVM` was
 compiled against, the software rendering DRI module (`swrast_dri.so`) can
 fail to load, because Tor Browser includes `libstdc++.so.6` as part of the
 bundle (and in the `LD_LIBRARY_PATH`).

 Snipped strace output, with a bunch of env vars set:
 {{{
 Tor/libstdc++.so.6: version `GLIBCXX_3.4.22' not found (required by
 /usr/lib/libLLVM-3.9.so))
 }}}

 This is non-fatal, but webGL will be broken on those systems.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20866>
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