[MacPorts] #66948: OpenBLAS @0.3.21_3: does not build universal on Apple Silicon Macs

[MacPorts]

#66948: OpenBLAS @0.3.21_3: does not build universal on Apple Silicon Macs
-----------------------+-------------------------
  Reporter:  kencu     |      Owner:  NicosPavlov
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  arm64
      Port:  openblas  |
-----------------------+-------------------------

Comment (by catap):

 Ken, I think the root cause is that gfortran-mp-12 can't build anything
 for x86_64 on arm.

 {{{
 catap at Kirills-mini-m1 /tmp % port -v installed gcc12
 The following ports are currently installed:
   gcc12 @12.3.0_0+stdlib_flag+universal (active)
 requested_variants='+universal' platform='darwin 22' archs='arm64 x86_64'
 date='2023-06-17T02:13:23+0200'
 catap at Kirills-mini-m1 /tmp % cat test.f90
 program hello
   print *, 'Hello, World!'
 end program hello
 catap at Kirills-mini-m1 /tmp % gfortran-mp-12 -arch arm64 -o test test.f90
 catap at Kirills-mini-m1 /tmp % file test
 test: Mach-O 64-bit executable arm64
 catap at Kirills-mini-m1 /tmp % rm -f test
 catap at Kirills-mini-m1 /tmp % gfortran-mp-12 -arch x86_64 -o test test.f90
 gfortran-mp-12: warning: this compiler does not support x86 ('-arch'
 option ignored)
 catap at Kirills-mini-m1 /tmp % file test
 test: Mach-O 64-bit executable arm64
 catap at Kirills-mini-m1 /tmp %
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66948#comment:2>
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