Fix build with MinGW on Windows.

REVIEW: 127328

CMakeLists.txt

@@ -306,6 +306,7 @@ add_library(okularpart SHARED ${okularpart_SRCS})
 generate_export_header(okularpart BASE_NAME okularpart)
 
 target_link_libraries(okularpart okularcore Qt5::Svg KF5::Parts ${MATH_LIB} Phonon::phonon4qt5 KF5::Solid KF5::KDELibs4Support KF5::Wallet KF5::Archive)
+set_target_properties(okularpart PROPERTIES PREFIX "")
 
 if (Qt5TextToSpeech_FOUND)
    target_link_libraries(okularpart Qt5::TextToSpeech)

interfaces/viewerinterface.h

@@ -11,7 +11,7 @@
 #define _OKULAR_VIEWERINTERFACE_H_
 
 #include "../core/okularcore_export.h"
-#ifdef _MSC_VER
+#ifdef Q_OS_WIN
 #define VIEWERINTERFACE_EXPORT __declspec(dllexport)
 #else
 #define VIEWERINTERFACE_EXPORT OKULARCORE_EXPORT

mobile/components/CMakeLists.txt

@@ -20,9 +20,8 @@ set(okular_SRCS
 
 kconfig_add_kcfg_files(okular_SRCS ${CMAKE_SOURCE_DIR}/conf/settings.kcfgc )
 
-set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/settings.cpp PROPERTIES COMPILE_DEFINITIONS "okularpart_EXPORTS")
-
 add_library(okularplugin SHARED ${okular_SRCS})
+set_target_properties(okularplugin PROPERTIES COMPILE_DEFINITIONS "okularpart_EXPORTS")
 target_link_libraries(okularplugin
         Qt5::Quick
         Qt5::Qml