[MacPorts] #54129: llvm-4.0 build fails due to libtool error on SnowLeopard when built with clang-3.9, but succeeds when built with clang-3.7

[MacPorts]

#54129: llvm-4.0 build fails due to libtool error on SnowLeopard when built with
clang-3.9, but succeeds when built with clang-3.7
-----------------------+-----------------
  Reporter:  kencu     |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  llvm-4.0  |
-----------------------+-----------------

Comment (by kencu):

 right here in CMakeList.txt
 {{{
  execute_process(COMMAND ${CMAKE_XCRUN} -find libtool
  OUTPUT_VARIABLE CMAKE_LIBTOOL
 }}}

 {{{
 $ xcrun -find libtool
  /Developer/usr/bin/libtool
 }}}
 I suppose CMAKE_LIBTOOL could be pushed in by the Portfile on systems that
 need it, if the llvm group doesn't want to monkey with the CMakeLists.txt
 logic.

--
Ticket URL: <https://trac.macports.org/ticket/54129#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS