[MacPorts] #67875: Buildbot on Intel tries to build PowerPC ports

[MacPorts]

#67875: Buildbot on Intel tries to build PowerPC ports
---------------------------+---------------------
 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
---------------------------+---------------------
 I thought we had configured buildbot so that it excludes impossible
 architectures for that worker. But here, virtuoso-5 was added, listing
 `supported_archs ppc ppc64`, yet the Intel buildbot workers went to work
 building it, failing immediately with:

 {{{
 DEBUG: Fetching virtuoso-5-5.0.15_0.darwin_17.i386.tbz2 archive size
 Error: virtuoso-5 cannot be installed for the configured build_arch
 'x86_64' because it only supports the arch(s) 'ppc ppc64'.
 }}}

 but not before spending many hours building all of its dependencies
 universal for i386 x86_64 first.

 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/199819

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Ticket URL: <https://trac.macports.org/ticket/67875>
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