[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 ryandesign@…):

 Forcing the activation doesn't ''fix'' anything, it just overwrites one
 port's files with another's, which is seldom a good thing to do.

 To be clear: my currently-installed cloog @0.16.3_1+universal is not being
 shown as outdated. If the intention is that cloog should depend on and use
 the isl port's files, then that is not currently happening, and a fix in
 the cloog port is needed.

 Yes, you can automate the unusual occurrence where files that were
 provided by a previous version of a port are now provided by a dependency.
 If there were a new revision/version of cloog that used isl's files and
 did not itself install the isl files, then the isl port would need to be
 modified to deactivate the existing cloog port to allow the upgrade to
 occur smoothly. We call this the "deactivate hack" and it's been used in
 several ports before. See the pre-activate block in the simutrans-pak64
 subport of the simutrans Portfile for an example.

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Ticket URL: <https://trac.macports.org/ticket/34477#comment:6>
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