Fix static builds

There were a few issues:
- Third party dependency info for plugins was not generated,
  because the depends and public_depends variables were not fetched.
  This caused issues when trying to use the qcocoa plugin in a
  consuming application, because Cups::Cups was not found.
- Privately linked libraries in extend_target were not considered when
  generating dependency info for modules. This caused issues in
  QtThemeSupport, becauese it could not find Qt::DBus, due to that
  target only being added as a private library in a conditional scope.
- Make sure to handle privately linked internal modules like
  PlatformModuleInternal to map to the Qt5 package, because there is no
  standalone package for it.

Also remove a TODO comment that says that qt_register_target_dependencies
should maybe be called in extend_target. That's already the case.

Change-Id: Ie99c52e800cd89e6f82008f1e38f4da5cd602929
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/cmake/QtPostProcess.cmake b/cmake/QtPostProcess.cmake
index dc16514825..568719d4f0 100644
--- a/cmake/QtPostProcess.cmake
+++ b/cmake/QtPostProcess.cmake
@@ -171,6 +171,8 @@ endfunction()
 
 function(qt_internal_create_plugin_depends_file target)
     get_target_property(qt_module "${target}" QT_MODULE)
+    get_target_property(depends "${target}" LINK_LIBRARIES)
+    get_target_property(public_depends "${target}" INTERFACE_LINK_LIBRARIES)
     get_target_property(target_deps "${target}" _qt_target_deps)
     set(target_deps_seen "")