Whenever I build the project with MSVC2013 (x64) compiler and run it through the debugger std::cout, std::cerr and std::clog are not properly redirected to the application output. Those streams are redirected normally if debugger is not attached. I haven't tried with any other compilers so it could technically be MSVC2013 only bug. On the other hand there is a question on stackoverflow.com about the same problem: http://stackoverflow.com/questions/17389157/no-application-output-in-qtcreator-debug

I've managed to build Qt5 with MSVC2013 doing only cosmetic changes to the source code. The changes are listed here http://stackoverflow.com/questions/18080625/qt-4-8-visual-studio-2012-compiling-error on FromHeartToSun's reply. I know this is not officially supported (yet) but I still decided to post this bug report here, remove it and please inform me about it if it is not appropriate.