[MacPorts] #69353: Macports base configure sets universal archs to arm64 x86_64 on powerpc-*-openbsd (i.e. both cpu and OS are 32-bit)

[MacPorts]

#69353: Macports base configure sets universal archs to arm64 x86_64 on
powerpc-*-openbsd (i.e. both cpu and OS are 32-bit)
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.9.1
 Keywords:                |       Port:
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 I am not sure universal archs have any meaning outside of macOS at all,
 but it will be reasonable to set them conditional on the triple and not
 randomly picked or hardcoded. Why would someone on a PowerPC want to build
 for arm64 ''by default?''

 Choice is also wrong on macOS 10.6, where universal archs are set to i386
 x86_64, even when the triple is powerpc-apple-darwin. (I guess this is why
 dtrace never worked for me – I accidentally noticed wrong archflags during
 the build recently.)

 P. S. I know they could be overridden by a configure arg, but fixing
 defaults will still be nice.

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Ticket URL: <https://trac.macports.org/ticket/69353>
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