[Bug 215709] Use of thread_local produces linking errors [now with gcc]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215709

            Bug ID: 215709
           Summary: Use of thread_local produces linking errors [now with
                    gcc]
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: threads
          Assignee: freebsd-threads at FreeBSD.org
          Reporter: h2+fbsdports at fsfe.org

192320 implemented __cxa_thread_atexit so that base's clang now supports
c++11's thread_local keyword. However, this seems to now have broken static
linking with the GCCs that complain about double definitions:

cd /home/mi/h4nn3s/devel/lambda-build/pkg/src && /usr/local/bin/cmake -E
cmake_link_script CMakeFiles/lambda.dir/link.txt --verbose=1
/usr/local/libexec/ccache/g++6     -fopenmp -Wno-vla -O3 -DNDEBUG -flto=8 -s  
-static CMakeFiles/lambda.dir/lambda.cpp.o  -o ../bin/lambda  -lpthread
-lexecinfo -lelf -lz -lbz2 
//usr/lib/libc.a(cxa_thread_atexit.o): In function `__cxa_thread_atexit':
/usr/src/lib/libc/stdlib/cxa_thread_atexit.c:(.text+0x0): multiple definition
of `__cxa_thread_atexit'
/usr/local/lib/gcc6/gcc/x86_64-portbld-freebsd11.0/6.3.0/../../../libstdc++.a(atexit_thread.o):/wrkdirs/usr/ports/lang/gcc6/work/gcc-6.3.0/libstdc++-v3/libsupc++/atexit_thread.cc:117:
first defined here
collect2: error: ld returned 1 exit status

So now a I have a workaround for FreeBSD<11 + LLVM and I seem to need one for
FreeBSD>=11 + GCC. Needless to say, static linking with LLVM already doesn't
work at all, because the necessary openmp .a is not shipped.
It's starting to really get confusing :o

Anything I can do to help fix this?

Thanks!

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