[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:
Resolution:            |   Keywords:  snowleopard haspatch
      Port:  clang-13  |
-----------------------+----------------------------------
Description changed by kencu:

Old description:

> 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'
> }}}

New description:

 FYI clang-13 / flang-13 / mlir-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'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63707#comment:4>
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