[MacPorts] #53186: qmake5 should change destroot.destdir (qmake PG idem)

[MacPorts]

#53186: qmake5 should change destroot.destdir (qmake PG idem)
-------------------------+---------------------
 Reporter:  RJVB         |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  qt5 qt4
-------------------------+---------------------
 I think the qmake portgroups should include a statement like

 {{{
 destroot.destdir "INSTALL_ROOT=${destroot}"
 }}}

 I had already observed this but now got confirmation on a Qt ML that this
 is indeed the official way to do a destroot'ed install.

 Using the default (`DESTDIR=${destroot}`) mostly works, but can have
 undesirable side-effects:

 {{{
 > ls -l `port work qt5-kde-devel-qtwebengine`
 drwxr-xr-x  8 bertin admin 612 Dec  2 12:18 qtwebengine-opensource-
 src-5.7.1
 drwxr-xr-x 11 bertin admin 510 Dec 31 01:44 build
 drwxr-xr-x  3 bertin admin 136 Dec 31 11:59
 destrootQtWebEngineCore.framework
 drwxr-xr-x  3 bertin admin 136 Dec 31 11:59 destrootQtWebEngine.framework
 drwxr-xr-x  3 bertin admin 136 Dec 31 11:59
 destrootQtWebEngineWidgets.framework
 drwxr-xr-x  3 bertin admin 102 Dec 31 11:59 destroot
 }}}

 Same thing happens for me with QtWebKit. The end result seems to be fine,
 but there's no guarantee that this will continue to be the case.

 A number of Qt5-dependent ports make this change themselves, that
 shouldn't be necessary, ideally.

--
Ticket URL: <https://trac.macports.org/ticket/53186>
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