[MacPorts] #46640: ld64 @136_3 +llvm34+universal (i386 + x86_64 + ppc): build fails with "'OSAtomicAdd64' was not declared in this scope" and "#error unknown default architecture"

[MacPorts]

#46640: ld64 @136_3 +llvm34+universal (i386 + x86_64 + ppc): build fails with
"'OSAtomicAdd64' was not declared in this scope" and "#error unknown
default architecture"
-----------------------+------------------------
  Reporter:  larryv@…  |      Owner:  jeremyhu@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.3
Resolution:            |   Keywords:
      Port:  ld64      |
-----------------------+------------------------

Comment (by jeremyhu@…):

 We need to force Using ld64-127 when ppc is a universal arch.

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Ticket URL: <https://trac.macports.org/ticket/46640#comment:1>
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