[MacPorts] #61701: clang-11 build fails on 10.9 with CMake Error:

[MacPorts]

#61701: clang-11 build fails on 10.9 with CMake Error:
-------------------------+----------------------
  Reporter:  cave-canem  |      Owner:  jeremyhu
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  clang-11    |
-------------------------+----------------------

Comment (by kencu):

 So I have this fixed now, as a 'brute-force' fix. I'm just going to see if
 I can make the 'elegant' fix.

 clang-11 built on 10.7, and failed on 10.6 only because the
 libc++abi.dylib there does not have thread_local enabled by default (same
 bootstrapping issue for the last two years now.).

 So we should be good across the whole spectrum again shortly.

-- 
Ticket URL: <https://trac.macports.org/ticket/61701#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS