[MacPorts] #62452: llvm-3.5 requires a C++11 runtime, which your configuration does not allow

[MacPorts]

#62452: llvm-3.5 requires a C++11 runtime, which your configuration does not allow
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  jeremyhu
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:  bigsur      |       Port:  llvm-3.5
------------------------+----------------------
 llvm-3.5 fails on macOS 11:

 https://build.macports.org/builders/ports-
 11_x86_64-builder/builds/23456/steps/install-port/logs/stdio

 {{{
 Error: llvm-3.5 requires a C++11 runtime, which your configuration does
 not allow
 }}}

 macOS 11 of course has a C++11 runtime.

 But the port is trying to make this determination by looking for
 /usr/lib/libc++.dylib in the filesystem. That won't work on macOS 11 since
 system libraries are no longer located in the filesystem.

-- 
Ticket URL: <https://trac.macports.org/ticket/62452>
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