The Qt 5 file hierarchy upon installation should be:
bin/ - executables run by the user
- unversioned applications, like assistant, linguist, qdbus,
qdbusviewer
- versioned applications, like qmake[35], qdoc5, qmlviewer5,
maybe moc5, uic5, rcc5
doc/ - gone to share/qt5/doc
examples/ - gone to share/qt5/examples
include/ - versioned include dirs:
QtCore5 or QtCore-5 or QtCore.5 or Qt5Core/
[...]
Qt/ - gone, forever, no replacement
imports/ - horribly flawed design, see below
lib/ - arch-specific files (also lib<qual> or lib/<arch>/)
./ - versioned libraries (.a, .so, .la, .prl)
pkgconfig/ - versioned .pc files
qt5/ - arch-specific support files:
bin/ or libexec/
- executables not run by the user, like syncqt, lrelease,
lupdate
imports/
- QtDeclarative imports
qml2/
- QML2 (including QtQuick2) arch-specific imports
mkspecs/ ?
share/ - arch-independent files
qml2/ - QML2 (including QtQuick2) arch-independent imports
qt5/
doc/
examples/
mkspecs/ ?
Note on imports: the design is flawed. It was flawed in Qt 4 and it's worse now
on Qt 5. For Qt 4, the flaw was that it did not differentiate QML imports that
were arch-independent from the ones that required plugins. With Qt 5, it
becomes worse because Qt Quick 1 and 2 share the same directory.
Instead, I recommend we immediately change QML2 to the system that Perl uses:
put the arch-specific files inside the lib hierarchy, for which distributions
have already solved the multiarch problem, but put arch-independent files in
the share hierarchy.
In addition, the loader should be clever to merge similar names from the two
different paths. That is, imagine a .qml file in share/qml2 that requires a
plugin: if the loader is a 32-bit application, it would search for the plugin
in lib/qt5/qml2, but if it's a 64-bit application it would search in
lib64/qt5/qml2.
Additionally, if we're still using QML2 by the Qt 6 release, the plugins could
be made available in lib/qt6/qml2.
As for mkspecs, I believe they should be in share, since they are technically-
speaking arch-independent.
--
Thiago Macieira - thiago.macieira (AT) intel.com
Software Architect - Intel Open Source Technology Center
Intel Sweden AB - Registration Number: 556189-6027
Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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