[MacPorts] #63630: OpenBLAS @0.3.18_0+gcc7+lapack+native: Builds ppc7400 on a G3

[MacPorts]

#63630: OpenBLAS @0.3.18_0+gcc7+lapack+native: Builds ppc7400 on a G3
-------------------------+-------------------------
  Reporter:  evanmiller  |      Owner:  NicosPavlov
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  powerpc g3
      Port:  OpenBLAS    |
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Comment (by evanmiller):

 After some further tinkering, I was able to compile and link on the G3,
 but running several of the tests I am encountering {{{SIGILL}}} (Illegal
 instruction). I have not confirmed but this is consistent with a scenario
 where the ppc7400 is still being compiled and executed -
 {{{-force_cpusubtype_ALL}}} is just relabeling the dylib as ppc.

 If there is ever a revival of interest in G3s this would be a good
 candidate (perhaps the only candidate) for my opt-in Altivec architecture
 proposal:

 https://github.com/macports/macports-base/pull/245

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Ticket URL: <https://trac.macports.org/ticket/63630#comment:6>
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