CMake: Avoid repeating DESTDIR when deploying QML plugins

Let CMAKE_INSTALL_PREFIX be "/usr/local", and consider a project with a
call to qt_generate_deploy_app_script.

Installing the project with DESTDIR set to "/tmp/bla" would install the
project targets to "/tmp/bla/usr/local" but Qt's QML modules to
"/tmp/bla/tmp/bla/usr/local".

That happened, because we used QT_DEPLOY_PREFIX as DESTINATION in
file(INSTALL). QT_DEPLOY_PREFIX starts with $ENV{DESTDIR} and
file(INSTALL) also prepends DESTDIR.

The value of QT_DEPLOY_PREFIX is controlled by CMAKE_INSTALL_PREFIX. Use
the latter as DESTINATION in file(INSTALL) calls.

Pick-to: 6.5
Task-number: QTBUG-109553
Change-Id: I8f06d81968fa0de4f17c4f8bc9b17cc052da4c12
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

0 files changed, 0 insertions, 0 deletions