Fix compilation with MinGW on Windows

Author: shoogle

build/cmake/SetupBuildEnvironment.cmake

@@ -53,6 +53,9 @@ elseif(CC_IS_MINGW)
         set(CMAKE_EXE_LINKER_FLAGS "-Wl,--large-address-aware")
     endif (NOT BUILD_64)
 
+    add_definitions(-D_UNICODE)
+    add_definitions(-DUNICODE)
+
 elseif(CC_IS_CLANG)
     message(STATUS "Using Compiler CLANG ${CMAKE_CXX_COMPILER_VERSION}")
 

src/libmscore/scorefile.cpp

@@ -449,16 +449,7 @@ bool MasterScore::saveFile(bool generateBackup)
             dir.mkdir(backupSubdirString);
 #ifdef Q_OS_WIN
             const QString backupDirNativePath = QDir::toNativeSeparators(backupDirString);
-#if (defined (_MSCVER) || defined (_MSC_VER))
-   #if (defined (UNICODE))
-            SetFileAttributes((LPCTSTR)backupDirNativePath.unicode(), FILE_ATTRIBUTE_HIDDEN);
-   #else
-            // Use byte-based Windows function
-            SetFileAttributes((LPCTSTR)backupDirNativePath.toLocal8Bit(), FILE_ATTRIBUTE_HIDDEN);
-   #endif
-#else
-            SetFileAttributes((LPCTSTR)backupDirNativePath.toLocal8Bit(), FILE_ATTRIBUTE_HIDDEN);
-#endif
+            SetFileAttributes(reinterpret_cast<LPCTSTR>(backupDirNativePath.unicode()->unicode()), FILE_ATTRIBUTE_HIDDEN);
 #endif
         }
         const QString backupName = QString(".") + info.fileName() + QString(",");