[MacPorts] #47047: new (meta)port submission: qt5-mac-mysql-plugins

[MacPorts]

#47047: new (meta)port submission: qt5-mac-mysql-plugins
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 Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
     Type:  submission   |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  qt5-mac-mysql-plugins
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 Attached a portfile for a new metaport, qt5-mac-mysql-plugins, which
 provides the mutually conflicting subports for Qt 5.

 This is an adapted copy of qt4-mac-mysql55-plugin which also provides the
 other mysql plugin variants, for Qt 4 . Contrary to that portfile, I've
 opted *not* to use one of the variants as the main port, but rather a stub
 main (meta) port, an approach I find a bit cleaner.

 I'm also trying a new (for me) way of defining the port version. Since it
 depends on the installed (and even the active) Qt port, I obtain the
 active version through the qmake executable that's an inevitable part of
 every Qt install.
 This should remove the need to bump the port version every time Qt is
 updated, and should even allow users to reinstall (using e.g. `port -n
 upgrade --force`) the installed subport after activating a different Qt 5
 version (regardless of whether that's qt5-mac or qt5-mac-devel).
 I hope I haven't overlooked potential issues with this approach.

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Ticket URL: <https://trac.macports.org/ticket/47047>
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