[MacPorts] #62770: clang++ 11 broken by MacOS 11.3 update

[MacPorts]

#62770: clang++ 11 broken by MacOS 11.3 update
-----------------------+---------------------------
  Reporter:  haberg-1  |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur x86_64
      Port:  clang-11  |
-----------------------+---------------------------

Comment (by kencu):

 toggling one of these in the libc++ headers in llvm-10 and llvm-11 on
 BigSur 11.3 might prove fruitful:

 {{{
 < #define _LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT
 ---
 > /* #undef _LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT */
 31c31
 < #define _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION 1
 ---
 > /* #undef _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION */
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62770#comment:11>
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