[MacPorts] #66188: libsdl2: re-enable universal building i386/x86_64

[MacPorts]

#66188: libsdl2: re-enable universal building i386/x86_64
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  Reporter:  kencu    |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  libsdl2  |
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Comment (by jmroot):

 Have you checked that the i386 slice works correctly? AIUI the issue is
 not the compiler but the ObjC runtime, which is part of the OS, and just
 doesn't have ARC support in the 32-bit version.

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Ticket URL: <https://trac.macports.org/ticket/66188#comment:1>
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