[MacPorts] #66302: gcc12 universal variant has no effect

[MacPorts]

#66302: gcc12 universal variant has no effect
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  Reporter:  JanWielemaker  |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.0
Resolution:                 |   Keywords:  universal arm64 x68_64
      Port:  gcc12          |
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Comment (by jmroot):

 There is no way to build a GCC that can target both x86_64 and arm64. You
 can get one that targets both i386 and x86_64 using multilib, which is
 what the fake "universal" variant does (it doesn't actually install a
 universal GCC on any platform.) It might be possible to build separate
 x86_64 and arm64 GCCs, one configured as a native compiler and one as a
 cross-compiler, depending on your hardware, and combine them somehow, but
 I suspect it wouldn't be as simple as a standard muniversal build. And you
 still wouldn't have a GCC that can target multiple architectures with a
 flag, you would have two different GCCs glued together, so the target arch
 would depend on which arch you run the binary as.

 Getting this to work the way everyone wants would have to involve an
 updated version of the driver-driver that Apple used to ship to enable ppc
 and i386 universal builds with gcc-4.x.

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Ticket URL: <https://trac.macports.org/ticket/66302#comment:1>
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