[MacPorts] #34477: cloog depends on isl but cloog and isl conflict

[MacPorts]

#34477: cloog depends on isl but cloog and isl conflict
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 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  defect                   |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  ports                    |     Version:  2.1.0                                
 Keywords:                           |        Port:  cloog isl                            
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Comment(by ecronin@…):

 When I asked about this on -dev a while back the answer was that 0.16.3_0
 epoch 0 and 0.16.3_0 epoch 1 are assumed to have identical contents, and
 that it is intentional that they won't show as outdated:

 http://old.nabble.com/Re%3A--91865--trunk-dports-science-netcdf-cxx-
 Portfile-p33679541.html:

 >It doesn't matter, by definition. A higher epoch just tells you that an
 >older-looking (but different) version is actually newer. If
 >name,version,revision,variants are all the same, it's the same software.

 >This means you can upgrade a port from 1.0 to 1.1, and then if there are
 >problems with 1.1, revert to 1.0 by increasing the epoch, and nobody who
 >hadn't upgraded yet has to rebuild.

 So you need to update to a revision that's never been used before for port
 to think the epoch 1 version is newer...

 I still think this is very confusing behavior, but I don't have the
 statistics on how many times epoch is upped and a pure revert happens vs
 the Portfiles not being identical for the same version between epochs.

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Ticket URL: <https://trac.macports.org/ticket/34477#comment:8>
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