[MacPorts] #42220: py-netcdf4 @1.0.4_1: build failure when using ccache

[MacPorts]

#42220: py-netcdf4 @1.0.4_1: build failure when using ccache
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  Reporter:  egall@…     |      Owner:  sean@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.2.1
Resolution:              |   Keywords:
      Port:  py-netcdf4  |
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Comment (by ryandesign@…):

 I fixed the immediate problem in r140527, but I'm not comfortable with the
 way this port works. It is not MacPorts custom for a port to build itself
 differently depending on how another port was built, but that's what py-
 netcdf4 does: it chooses which compiler to use based on the compiler that
 was used for netcdf. With netcdf it's possible to discover what compiler
 was used by checking which variants are selected in "port installed
 netcdf", but py-netcdf4 doesn't have compiler variants so that's not
 possible. That would also mean that if a user gets a binary from our
 packages server it might have been built with a different compiler than
 the netcdf on the user's system. If it's really so important that py-
 netcdf4 uses the same compiler as netcdf, then py-netcdf4 needs to get the
 same variants that netcdf has, and the require_active_variants procedure
 in the active_variants 1.1 portgroup needs to be used to ensure the
 variants the user has selected for the two ports match.

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Ticket URL: <https://trac.macports.org/ticket/42220#comment:15>
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