CMake: Provide API to allow handling of QML static plugins

This change adds a new -cmake-output command line argument to
qmlimportscanner which outputs its result in a format which is
consumable by CMake.

This change also adds a new CMake package called Qt5QmlImportScanner.
It provides a function called QT5_IMPORT_QML_PLUGINS()
which is useful for projects that use a static build of Qt and which
also use QML plugins.

Calling it with the target name of your application does the
following:
- Runs qmlimportscanner at configure time to find out which QML /
QtQuick plugins are used by your project
- Links the imported QML plugins into the target
- Links the static dependencies of the QML plugins into the target
- Generates a .cpp file that initializes imported QML plugins,
which is subsequently compiled and linked into the given target

When Qt is built in a shared library config, the introduced function
is a no-op.

[ChangeLog][CMake] Added ability to import static qml plugins with
CMake builds using the new QT5_IMPORT_QML_PLUGINS function.

Task-number: QTBUG-38913
Change-Id: Ib9b9a69654eab13dfbe12d10f5cb28ba3c307d1b
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/qmlimportscanner/Qt5QmlImportScannerTemplate.cpp.in b/tools/qmlimportscanner/Qt5QmlImportScannerTemplate.cpp.in
new file mode 100644
index 0000000000..4ed747a555
--- /dev/null
+++ b/tools/qmlimportscanner/Qt5QmlImportScannerTemplate.cpp.in
@@ -0,0 +1,5 @@
+// This file is autogenerated by CMake. It imports static plugin classes for
+// static plugins used by QML imports.
+#include <QtPlugin>
+
+@qt5_qml_import_cpp_file_content@