Fix Windows linker and runtime errors when building against static Qt

cmake/FindLibGPGError.cmake

@@ -0,0 +1,9 @@
+
+find_path(GPGERROR_INCLUDE_DIR gpg-error.h)
+
+find_library(GPGERROR_LIBRARIES gpg-error)
+
+mark_as_advanced(GPGERROR_LIBRARIES GPGERROR_INCLUDE_DIR)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(LibGPGError DEFAULT_MSG GPGERROR_LIBRARIES GPGERROR_INCLUDE_DIR)

src/CMakeLists.txt

@@ -218,6 +218,7 @@ target_link_libraries(${PROGNAME}
                       Qt5::Widgets
                       Qt5::Network
                       ${GCRYPT_LIBRARIES}
+                      ${GPGERROR_LIBRARIES}
                       ${ZLIB_LIBRARIES})
 
 set_target_properties(${PROGNAME} PROPERTIES ENABLE_EXPORTS ON)

src/main.cpp

@@ -28,6 +28,16 @@
 #include "gui/MainWindow.h"
 #include "gui/MessageBox.h"
 
+#ifdef QT_STATIC
+#include <QtPlugin>
+
+#ifdef Q_OS_WIN
+Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin)
+#elif Q_OS_LINUX
+Q_IMPORT_PLUGIN(QXcbIntegrationPlugin)
+#endif
+#endif
+
 int main(int argc, char** argv)
 {
 #ifdef QT_NO_DEBUG

tests/CMakeLists.txt

@@ -92,6 +92,7 @@ set(TEST_LIBRARIES
     Qt5::Widgets
     Qt5::Test
     ${GCRYPT_LIBRARIES}
+    ${GPGERROR_LIBRARIES}
     ${ZLIB_LIBRARIES}
 )
 

utils/CMakeLists.txt

@@ -20,6 +20,7 @@ target_link_libraries(kdbx-extract
                       keepassx_core
                       Qt5::Core
                       ${GCRYPT_LIBRARIES}
+                      ${GPGERROR_LIBRARIES}
                       ${ZLIB_LIBRARIES})
 
 add_executable(kdbx-merge kdbx-merge.cpp)
@@ -27,6 +28,7 @@ target_link_libraries(kdbx-merge
                       keepassx_core
                       Qt5::Core
                       ${GCRYPT_LIBRARIES}
+                      ${GPGERROR_LIBRARIES}
                       ${ZLIB_LIBRARIES})