[Bug 221124] FreeBSD11.1 + nvidia + libmap.conf~gcc crashes most apps

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221124

            Bug ID: 221124
           Summary: FreeBSD11.1 + nvidia + libmap.conf~gcc crashes most
                    apps
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: h2+fbsdports at fsfe.org

I use my workstation for software development and make use of the great weekly
compiler snapshots of gcc and clang. To make the newer GCCs work out-of-the-box
I have added to my /etc/libmap.conf:
libgcc_s.so.1   gcc8/libgcc_s.so.1
libgomp.so.1    gcc8/libgomp.so.1
libssp.so.0     gcc8/libssp.so.0
libstdc++.so.6  gcc8/libstdc++.so.6

This has always worked fine. But, after my first update to FreeBSD11.0,
everything seemed broken, many apps (Firefox, gajim) immediately segfaulted,
some after routine usage (most KDE apps). At the time a downgrade of the
nvidia-driver to 340 solved these problems.

Now, after updating to 11.1 I was seeing them again, independent of the
Nvidia-driver version. After some investigation, I found that this little test:
https://github.com/dumbbell/test-tls-initial-exec
already triggers the problem. It belongs to 
https://lists.freebsd.org/pipermail/freebsd-arch/2016-February/017699.html
so I suspect the whole thing is related to the parallel introduction of
mesa-libs with the nvidia driver and some shared library magic breaking with
newer GCC's standard library?

I can work around this for now, but it was  quite hard to actually pin this
down to libmap.conf and I suspect it will cause issues in other situations, as
well. 

Thanks for your help,
Hannes

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