[MacPorts] #63521: clang-12 @12.0.1 +analyzer+libstdcxx fails in patch stage

[MacPorts]

#63521: clang-12 @12.0.1 +analyzer+libstdcxx fails in patch stage
-----------------------+----------------------
  Reporter:  p-bro     |      Owner:  kencu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.1
Resolution:            |   Keywords:
      Port:  clang-12  |
-----------------------+----------------------
Changes (by p-bro):

 * Attachment "main.log" added.

 clang-12 build log

-- 
Ticket URL: <https://trac.macports.org/ticket/63521>
MacPorts <https://www.macports.org/>
Ports system for macOS