[Bug 192320] New: Use of thread_local produces linking errors on system version of clang++

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192320

            Bug ID: 192320
           Summary: Use of thread_local produces linking errors on system
                    version of clang++
           Product: Base System
           Version: 10.0-STABLE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: troy.heron at hixxy.org

During porting of a C++ application to FreeBSD I have discovered problem with
using thread_local with the system version of Clang 3.3.

As below, it's use produces linking errors to the C++ ABI.

troy at freebsd10:~ # cat tl.cpp
#include <string>

thread_local std::string test;

int main()
{
}

troy at freebsd10:~ # clang++ -std=c++11 tl.cpp -o tl 
/tmp/tl-7sN7Nb.o: In function `__cxx_global_var_init':
tl.cpp:(.text+0xbb): undefined reference to `__cxa_thread_atexit'
clang++: error: linker command failed with exit code 1 (use -v to see
invocation)
troy at freebsd10:~ # 

troy at freebsd10:~ # clang++ -v
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
Target: x86_64-unknown-freebsd10.0
Thread model: posix
troy at freebsd10:~ #

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