Error using Qt 5.1.1 in code::blocks - c++

Question

I am trying to combine Code::Blocks IDE and Qt 5.1.1 on my win7 32bit. In CB I use MinGW's g++ compiler which supports C++0x.
I downloaded "qt-windows-opensource-5.1.1-mingw48_opengl-x86-offline.exe" and installed at "D:\Qt-library\5.1.1\mingw48_32\".
Then in CB I added three tools named "qmake -project" , "qmake" and "make" at Tools->Configure tools->add.
"qmake -project" with Executable "D:\Qt-library\5.1.1\mingw48_32\bin\qmake.exe", Parameters: "-project -platform win32-g++"
"qmake" with Excutable same as "qmake -project", no parameter;
"make" with Excutable "D:\Qt-library\Tools\mingw48_32\bin\mingw32-make.exe", no parameter
Working directory all set to "${PROJECT_DIR}"
And I clicked project->properties, selected "This is a custom Makefile"
Then I clickd the "qmake -project" menu item in Tools menu which I created as above, qmake generated a .pro file.
Because I use
#include <QApplication>
instead of
#include <QtGui/QApplication>
in main.cpp file so I added "QT += widgets" in the .pro file.
Then click "qmake" in Tools menu, makefiles are generated. If I directly make, it won't compile, because it doesn't support some C++11 grammars,
so I edited the Makefile.Debug and makefile.Release, it looks like:
CC = gcc
CXX = g++
DEFINES = -DUNICODE -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN
CFLAGS = -pipe -fno-keep-inline-dllexport -O2 -Wall -Wextra $(DEFINES)
CXXFLAGS = -pipe -fno-keep-inline-dllexport -O2 -frtti -Wall -Wextra -fexceptions -mthreads $(DEFINES)
I added -std=c++0x at the line CXXFLAGS, so it become
CXXFLAGS = -pipe -std=c++0x -fno-keep-inline-dllexport -O2 -frtti -Wall -Wextra -fexceptions -mthreads $(DEFINES)
(it won't work for my version of MinGW if I use -std=c++11)
Then click "make" in the Tools menu, I get two errors:
I don't know what the hell was that but some how I modified my main function from
int main(int argc, char** argv)
to int qMain(int argc, char** argv). Then make again, the two qMain error disappeared but I got this:
And now, I didn't do any thing, make again, that error disappeared !!!
But generated .exe file won't do anything, either double click or run in command line, nothing would happen (by the way, although I included , I didn't write any Qt code)
If I remove
#include <QApplication>
and build the project in normal way(cancel "This is a custom Makefile" and build directly), my program goes well.
Another thing very weird, I added CONFIG += debug and CONFIG -= release in the .pro file, qmake will generate both Makefile.Debug and Makefile.Release（whatever CONFIG or debug and release is uper or lower case）, but generated .o files and .exe files are all in release directory, no debug file, why was that ?
Anyone has any ideas ? I'll be very thankful for your suggestions.

Answer 1

The problem is solved(although not perfectly).
The fact is that the program did do something, but somehow no console window appear(before I add Qt header, I wrote the program in C++ and use cout to print messages), thus no output can be seen, even if I run the program in console. I found this by writing a simple Qt GUI program to print the results, it works. But I don't know the reason why console wouldn't appear with QApplication included but no Qt code in the program (whatever I set project->properties->build targets->select build target options->type to GUI or console).
On the other hand, I can run the Qt GUI program by double clicking the .exe file in the debug directory, but not in Code::Blocks, it pops up "cannot locate program entry InterlockedCompareExchange#12 on dynamic link library libstdc++-6.dll". Thus I can't debug the program through CB.