[MacPorts] #63707: clang-13: fix for SnowLeopard

[MacPorts]

#63707: clang-13: fix for SnowLeopard
--------------------+--------------------
 Reporter:  kencu   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
--------------------+--------------------
 FYI clang-13 builds without trouble on SnowLeopard if libcxx has been
 upgraded to the version that supports thread_local_storage:
 {{{
 To rebuild libcxx with full thread_local support, please install clang-9.0
 or any macports-clang >= clang-5.0 and then rebuild libcxx like this:

 sudo port -v -n upgrade --force --enforce-variants libcxx +emulated_tls
 }}}

 and if the attached patch is used.

 {{{
 $ port -v installed clang-13
 The following ports are currently installed:
   clang-13 @13.0.0_0+analyzer+defaultlibcxx+libstdcxx (active)
 requested_variants='' platform='darwin 10' archs='x86_64'
 date='2021-10-27T09:39:39-0700'
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/63707>
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