[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 adfernandes@…):

 Uhh... mcalhoun - any idea what to do about this?  For me, a one-time
 `port -f` fixed the dependency.

 The problem is that `cloog` can be built using an internal `isl` (which it
 then installs) or the "system" `isl`, on which it will then depend.

 Pre r92992 has `cloog` using and installing its own internal `isl`. r92992
 and later has it use the system `isl`. However, the dependent `isl` can't
 be installed because the current `cloog` (the one being upgraded) has its
 own `isl`.

 Nope - no surprise to me why `gcc`'s graphite is not enabled by default.

 So... is there a way to automate this sort of dependency loop?

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Ticket URL: <https://trac.macports.org/ticket/34477#comment:5>
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