[MacPorts] #55857: boost @1.66.0_0 +universal has no i386 symbols

[MacPorts]

#55857: boost @1.66.0_0 +universal has no i386 symbols
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  Reporter:  devernay  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  i386
      Port:  boost     |
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Comment (by kencu):

 I am new to boost, but it looks to me like the `-arch` flags for darwin
 are added in the subroutine `setup-address-model` in this file:

 <https://github.com/boostorg/build/blob/0d0c656c1164efbfe8568a09353f374839c26ac4/src/tools/darwin.jam>

 I note there are rules that call this subroutine for compiling *.m and
 *.mm files in that darwin.jam file, and rules that call this subroutine
 for linking, but I don't see any rules for calling it when compiling *.c
 and *.cpp files.

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Ticket URL: <https://trac.macports.org/ticket/55857#comment:10>
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