[MacPorts] #64585: Emulated TLS is broken under macOS 10.6?

[MacPorts]

#64585: Emulated TLS is broken under macOS 10.6?
--------------------+--------------------
 Reporter:  catap   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
--------------------+--------------------
 I've installed last macports clangs on my test macOS 10.6 as:
 {{{
 macOS-Snow-Leopard:~ catap$ port installed | grep clang-
   clang-9.0 @9.0.1_4+defaultlibcxx+emulated_tls+libstdcxx
   clang-10 @10.0.1_5+defaultlibcxx+emulated_tls+libstdcxx (active)
   clang-11 @11.1.0_3+defaultlibcxx+emulated_tls+libstdcxx (active)
 macOS-Snow-Leopard:~ catap$
 }}}

 Let me create small test to enjoy emulated TLS::
 {{{
 #include <vector>

 int main() {
   thread_local std::vector<int> foo;
   return 0;
 }
 }}}

 an attemp to build it fails:
 {{{
 macOS-Snow-Leopard:tmp catap$ clang++-mp-11 test.cc
 Undefined symbols for architecture x86_64:
   "___cxa_thread_atexit", referenced from:
       _main in test-d301bb.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 macOS-Snow-Leopard:tmp catap$ clang++-mp-10 test.cc
 Undefined symbols for architecture x86_64:
   "___cxa_thread_atexit", referenced from:
       _main in test-4fab06.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 macOS-Snow-Leopard:tmp catap$ clang++-mp-9.0 test.cc
 Undefined symbols for architecture x86_64:
   "___cxa_thread_atexit", referenced from:
       _main in test-fc4772.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 macOS-Snow-Leopard:tmp catap$
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/64585>
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