[MacPorts] #59938: clang-3.7 build fails during py37-numpy install

[MacPorts]

#59938: clang-3.7 build fails during py37-numpy install
------------------------------------+--------------------
  Reporter:  TheLastLovemark        |      Owner:  (none)
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.6.2
Resolution:                         |   Keywords:
      Port:  clang-3.7, py37-numpy  |
------------------------------------+--------------------

Comment (by kencu):

 You're trying to build `i386` on `10.13` but you have Xcode 10 and no SDK
 with `i386` support, it appears:
 {{{
 :debug:sysinfo macOS 10.13 (darwin/17.7.0) arch i386
 :debug:sysinfo MacPorts 2.6.2
 :debug:sysinfo Xcode 10.1
 }}}
 so this leads to an error:
 {{{
 ld: warning: ignoring file
 /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd,
 missing required architecture i386 in file
 /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/lib/libSystem.tbd
 }}}

 Either you have to build as only 64bit, or you have to find and add the
 MacOSX10.13.sdk to the proper locations in
 {{{
 /Library/Developer/CommandLineTools/SDKs
 }}}
 and in Xcode as well.

-- 
Ticket URL: <https://trac.macports.org/ticket/59938#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS