[MacPorts] #52585: libcxxabi -- attempts to add thread-local-storage (TLS) to <10.7

[MacPorts]

#52585: libcxxabi -- attempts to add thread-local-storage (TLS) to <10.7
------------------------------------+--------------------------------
  Reporter:  ken-cunningham-webuse  |      Owner:  macports-tickets@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:
      Port:  libcxxabi              |
------------------------------------+--------------------------------

Comment (by kencu):

 Happy to report this looks to be working now.

 I rebuilt libcxx adding in the cxa_thread_atexit file using the thread-
 enabled version of clang-5.0, and then once that was done, I rebuilt
 clang-5.0 with this modification:
 {{{
 Name = (T.isOSDarwin() && !T.isMacOSXVersionLT(10, 7)) ?  "_tlv_atexit" :
 "__cxa_thread_atexit";
 }}}
 and using that, everything builds nicely, no link errors found, and
 filezilla builds through to completion and seems to be working as it
 should.

 Need to do some thorough testing, and then perhaps make this available to
 everyone.

--
Ticket URL: <https://trac.macports.org/ticket/52585#comment:11>
MacPorts <https://www.macports.org/>
Ports system for macOS