[MacPorts] #59239: sundials: builds fail on 10.6 buildbots; (was: mpich-default uses clang-8.0 at runtime but doesn't declare a dependency on it)

[MacPorts]

#59239: sundials: builds fail on 10.6 buildbots; (was: mpich-default uses clang-8.0
at runtime but doesn't declare a dependency on it)
-----------------------------+---------------------
  Reporter:  ryandesign      |      Owner:  mascguy
      Type:  defect          |     Status:  closed
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.6.1
Resolution:  fixed           |   Keywords:
      Port:  sundials mpich  |
-----------------------------+---------------------

Comment (by barracuda156):

 Replying to [comment:7 mascguy]:
 > This issue a bit different now, as `mpich +clang90` is being requested
 on 10.6, even though that combination isn't supported. So I'll have to add
 some debug output to the mpi portgroup, to see what's happening.
 >
 > However, when a valid 10.6 `mpich` combination is requested - such as
 `+mpich +gcc7` - builds succeed. As do those with `openmpi`, such as
 `+openmpi +clang90`.

 Unfortunately, it does not help:

 36-9:make svacchanda$ sudo port install sundials  +mpich +gcc7
 Warning: configured user/group macports does not exist, will build as root
 --->  Computing dependencies for sundials
 Error: Cannot install mpich-gcc7 for the arch 'ppc' because
 Error: its dependency clang-9.0 only supports the archs 'i386 x86_64'.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there is
 a bug.
 Error: Processing of port sundials failed

-- 
Ticket URL: <https://trac.macports.org/ticket/59239#comment:15>
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