Summary:
QT_USE_FAST_OPERATOR_PLUS has been deprecated in Qt 4.8, in favour of
QT_USE_QSTRINGBUILDER. The latter also covers QByteArray.

Qt5 headers still supports QT_USE_FAST_OPERATOR_PLUS (at least 5.11.1),
as subset of QT_USE_QSTRINGBUILDER as it was introduced in Qt4.8,
but not as documented build flag.

Given QT_USE_QSTRINGBUILDER is set here and thus triggers anything that
QT_USE_FAST_OPERATOR_PLUS would trigger in Qt code, removing it should
clean up the macro from undocumented features and thus reduce confusion.

No non-Qt is known at least in KDE repos which checks this build flag
otherwise, so no regression should be expected here as well.

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: kde-frameworks-devel, kde-buildsystem

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D13800

Reviewers: cgiboudeaux, apol

Reviewed By: cgiboudeaux, apol

Subscribers: apol, kde-frameworks-devel, kde-buildsystem, cgiboudeaux, dhaumann

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D10166

Summary:
It's not a thing on flatpak and it makes packaging weird.
Should fix https://github.com/flatpak/freedesktop-sdk-base/issues/22

Reviewers: #frameworks, cgiboudeaux

Reviewed By: cgiboudeaux

Subscribers: cgiboudeaux, eszlari, kde-frameworks-devel, kde-buildsystem

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D13102

Summary:
Otherwise we hit a weird code path on androiddeployqt. This is what the official SDK looks like anyway:
```
$ ls /opt/Qt/5.10.1/android_armv7/
bin  doc  include  jar  lib  mkspecs  plugins  qml  src  translations
```

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: #frameworks, #build_system

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D12269

Summary:
We already have rpaths anyway and it breaks running applications from
within the build directory:
https://community.kde.org/Guidelines_and_HOWTOs/Making_apps_run_uninstalled

Reviewers: #frameworks, dfaure, ngraham, graesslin

Reviewed By: ngraham, graesslin

Subscribers: graesslin, ngraham, #build_system

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D9550

Summary:
If enabled it will install a prefix.sh script to the root of the prefix.
This file will be useful to be able to easily set up a prefix to be used by
integrating the environment variables it exports.

Test Plan:
```
$ cat prefix.sh
export PATH=/home/apol/devel/kde5/bin:$PATH
export LD_LIBRARY_PATH=/home/apol/devel/kde5/lib64:$LD_LIBRARY_PATH

export XDG_DATA_DIRS=/home/apol/devel/kde5/share:${XDG_DATA_DIRS:-/usr/local/share/:/usr/share/}
export XDG_CONFIG_DIRS=/home/apol/devel/kde5/etc/xdg:${XDG_CONFIG_DIRS:-/etc/xdg}

export QT_PLUGIN_PATH=/home/apol/devel/kde5/lib64/plugins:$QT_PLUGIN_PATH
export QML2_IMPORT_PATH=/home/apol/devel/kde5/lib64/qml:$QML2_IMPORT_PATH
```

Reviewers: #frameworks, sitter

Reviewed By: sitter

Subscribers: kfunk, bcooksley, ngraham, sitter, cgiboudeaux, #build_system

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D9299

Reviewers: kossebau

Subscribers: #build_system, #frameworks

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D7612

VERSION_GREATER_EQUAL was added in CMake 3.7 and ECM still depends on CMake 2.8.12

Summary:
For compatibility reasons, this is only enabled when projects
upgrade their find_package(ECM) line to request a version >= 5.38.
A little bit like cmake policies: just upgrading ECM is compatible,
while increasing the required version can change behaviour.

Test Plan:
Tested make test in all KF5 frameworks; I have patches
for some of them which I can't commit until this is in.

Reviewers: cgiboudeaux, kfunk

Reviewed By: cgiboudeaux, kfunk

Subscribers: kfunk, #frameworks, #build_system

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D7198