[MacPorts] #37320: tbb: add universal variant

[MacPorts]

#37320: tbb: add universal variant
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  tbb           |
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Comment (by ryandesign@…):

 No, it's not related. Ports like tbb that don't use a standard build
 system need help both using the right compiler and using the right
 architecture (and a universal build is a continuation of using the right
 architecture), but they are separate tasks. tbb's build system is unusual
 and takes a special command line argument to indicate the desired
 architecture. As far as I know, multiple architectures cannot be specified
 simultaneously with this build system. So a universal build would involve
 building separately for each architecture and then combining with `lipo`.
 That's what the muniversal portgroup does, however the muniversal
 portgroup also currently requires a standard destroot phase, which the tbb
 port does not have, because again the tbb build system is unusual and its
 Makefile does not have an `install` target, so we install things manually.

 It might not be too difficult to convert the custom destroot block into a
 Makefile `install` target, at which point using the muniversal portgroup
 should become possible.

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Ticket URL: <https://trac.macports.org/ticket/37320#comment:10>
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