Make compatible with qt5-static build

src/qt/CMakeLists.txt

@@ -107,6 +107,13 @@ target_link_libraries(
     Threads::Threads
 )
 
+# needed for static builds
+if (WIN32)
+    qt_import_plugins(plat INCLUDE Qt5::QWindowsIntegrationPlugin Qt5::QICOPlugin QWindowsVistaStylePlugin)
+else()
+    qt_import_plugins(plat INCLUDE Qt5::QICOPlugin)
+endif()
+
 if (PkgConfig_FOUND)
     pkg_check_modules(RTMIDI rtmidi)
     if (RTMIDI_FOUND)

src/qt/qt_main.cpp

@@ -4,6 +4,16 @@
 #include <QThread>
 #include <QTimer>
 
+#ifdef QT_STATIC
+/* Static builds need plugin imports */
+#include <QtPlugin>
+Q_IMPORT_PLUGIN(QICOPlugin)
+#ifdef Q_OS_WINDOWS
+Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)
+Q_IMPORT_PLUGIN(QWindowsVistaStylePlugin)
+#endif
+#endif
+
 #include <86box/86box.h>
 #include <86box/plat.h>
 #include <86box/ui.h>