Change the -qpa configure argument logic

Parse the -qpa configure argument as list and translate it to the
QT_QPA_PLATFORMS cmake variable. This variable is new to the Qt build
procedure. The QT_QPA_DEFAULT_PLATFORM variable supposed to get
multiple values, but this didn't work at all, since the variable value
then was used in the compile definition that is expected to be a single
value QPA platfrom definition. This inconsistency forced to introduce
a new variable.

The QT_QPA_DEFAULT_PLATFORM variable now controls the first-choice QPA
plugin for the GUI applications. The new configure argument
-default-qpa is now translated to the QT_QPA_DEFAULT_PLATFORM variable
instead the of -qpa one. The -qpa configure argument is now translated
to the QT_QPA_PLATFORMS variable, which is new one as well. The
variable contains the list of QPA plugins that are "default" for this
Qt configuration. The meaning of the "default" plugins is related to
the DEFAULT_IF argument of qt_internal_add_plugin command. Plugins
that are listed in the QT_QPA_PLATFORMS variable will be treated as
default by the build system and will be deployed within user
applications when using deployment API or linked statically when using
static Qt.

The QT_QPA_DEFAULT_PLATFORM falls back to the QT_QPA_PLATFORMS first
value in the list if it's not set explicitly and either
'-DQT_QPA_PLATFORMS' or '-qpa' arguments are specified.

[ChangeLog][CMake] Added QT_QPA_PLATFORMS variable which controls the
list of QPA plugins that will be deployed within the applications by
default.
[ChangeLog][CMake] The '-qpa' configure argument now is mapped to the
QT_QPA_PLATFORMS variable and has different functionality. It doesn't
control the platform plugin that the GUI application is using by
default, but controls the list of QPA plugins that will be deployed
within the applications by default.
[ChangeLog][CMake] Added '-default-qpa' argument which replaces the
'-qpa' one. The argument is translated to the QT_DEFAULT_QPA_PLATFORM
CMake variable and selects the default platform that should be used
by GUI application if QT_QPA_PLATFORM environment variable is not set.

Task-number: QTBUG-124265
Task-number: QTBUG-87805
Task-number: QTBUG-124449
Change-Id: Ibcebaccc535aaed6374f15ccfeddb3e6128f5ce0
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

0 files changed, 0 insertions, 0 deletions