[MacPorts] #37846: cctools as does not support AVX, consider using llvm

[MacPorts]

#37846: cctools as does not support AVX, consider using llvm
--------------------------+--------------------------------
  Reporter:  wd11@…       |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.2
Resolution:               |   Keywords:
      Port:  cctools gcc  |
--------------------------+--------------------------------

Comment (by raimue):

 MacPorts forces gcc to use `${prefix}/bin/as` instead, which comes from
 cctools.

 `/usr/bin/as` is already be the LLVM assembler on my system. There is no
 need to use `as -q` as far as I can see.

 {{{
 $ sw_vers -productVersion
 10.12.6
 $ xcodebuild -version
 Xcode 9.2
 Build version 9C40b
 $ /usr/bin/as -v |& head -1
 Apple LLVM version 9.0.0 (clang-900.0.39.2)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/37846#comment:15>
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