[MacPorts] #56043: libemos @2.4.2 cannot install the port

[MacPorts]

#56043: libemos @2.4.2 cannot install the port
-------------------------+----------------------
  Reporter:  david-pino  |      Owner:  tenomoto
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.2
Resolution:              |   Keywords:
      Port:  libemos     |
-------------------------+----------------------
Changes (by ryandesign):

 * cc: dstrubbe, MarcusCalhoun-Lopez, seanfarley (added)


Comment:

 Replying to [ticket:56043 david-pino]:
 > {{{
 > Error: Install port:fftw-3 +gcc7
 > Error: Failed to fetch libemos: port:fftw-3 +gcc7 not installed
 > }}}
 > I've correctly installed fftw-3 and gcc7

 What this message was trying to tell you is that you needed to install the
 fftw-3 port with the +gcc7 variant.


 Replying to [comment:7 kencu]:
 > Now to figure out how to automate this so nobody else will have this
 issue...perhaps, as libemos has a default of +gcc7, we should set that up
 to `require_activate_variants +gcc7` in `fftw-3`...

 The libemos port already uses similar capabilities provided by the
 compilers 1.0 portgroup. It is unfortunate that the compilers portgroup
 reimplemented this and uses a different format of message for
 communicating this with users, rather than just using the existing
 facilities of the active_variants 1.1 portgroup. Maybe the compilers 1.0
 portgroup can be changed to do that, or at least reword its messages so
 that they are the same as those from the active_variants 1.1 portgroup.

-- 
Ticket URL: <https://trac.macports.org/ticket/56043#comment:9>
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