[MacPorts] #58646: gcc8 @8.3.0_4 +universal: does not build/install universal libraries

[MacPorts]

#58646: gcc8 @8.3.0_4 +universal: does not build/install universal libraries
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  Reporter:  Ionic      |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  gcc8 gcc9  |
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Comment (by cjones051073):

 Replying to [comment:7 Ionic]:
 > OpenBLAS uses Fortran and... I guess that for some reason people want to
 select what compiler to use. For me it's just another dependency, but we
 also have similar setups for, e.g., the `root` ports. Not exposing the
 selection to the user would not help in this case, though, since even when
 only used internally it wouldn't depend on any `libgcc` version directly
 or indirectly.

 Well it would, if it manually set up that dependency on libgcc itself....

 If you check the latest root6 port version you will see I actually have
 removed the gcc variants, for very similar reasons to those here, to not
 expose the gcc version to the user as a variant. I think it does make
 sense to for openblas.

 >
 > Yes, the variant was not automatically switched. But additionally,
 `libgcc9` replaced content installed by `libgcc8`, but nothing pulled in
 the `+universal` variant.
 >
 > Installing `OpenBLAS +universal+gcc9` fails in exactly the same way.
 Even though the compilers PG is used, no dependency upon the correct
 libgcc version is added, so no architecture check takes place which would
 rebuild libgcc stuff with `+universal`.

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Ticket URL: <https://trac.macports.org/ticket/58646#comment:10>
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