[MacPorts] #49001: Add support to provide a clang-based as wrapper

[MacPorts]

#49001: Add support to provide a clang-based as wrapper
------------------------------------+----------------------
  Reporter:  howarth.at.macports@…  |      Owner:  jeremyhu
      Type:  defect                 |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.3
Resolution:                         |   Keywords:
      Port:  clang-3.7              |
------------------------------------+----------------------

Comment (by kencu):

 I believe this has been fixed by recent changes made by jmr to the cctools
 port, to make it use clang by default as the assembler.

-- 
Ticket URL: <https://trac.macports.org/ticket/49001#comment:20>
MacPorts <https://www.macports.org/>
Ports system for macOS