libgcc_s_sjlj-1.dll is missing in Qt 5.1 - c++

Question

My program won't start, complaining that libgcc_s_sjlj-1.dll is needed. However, this file doesn't exist in Qt directory. I did some search and found that -static-libgcc and -static-libstdc++ should be added. So here is my .pro file:
QT += core gui xml
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = mouseEventProcess
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp \
fileOp.cpp \
xmlpraser.cpp \
pixmapOp.cpp \
mathOp.cpp
HEADERS += mainwindow.h \
fileOp.h \
xmlpraser.h \
pixmapOp.h \
mathOp.h
FORMS += mainwindow.ui
#COMPILE LIBGCC_S_SJLJ-1.DLL AND LIBSTDC++-6.DLL INTO THE EXE FILE
win32{
QMAKE_LFLAGS += -static-libgcc
QMAKE_LFLAGS += -static-libstdc++
#BOOST LIBRARIES. CHANGE TO YOUR OWN.
INCLUDEPATH += D:/boost_1_51_0
#OPENCV LIBRARIES. CHANGE TO YOUR OWN.
INCLUDEPATH += D:/opencv2.4.4/include
INCLUDEPATH += D:/opencv2.4.4/release/install/include
LIBS += -LD:/opencv2.4.4/release/install/lib \
-lopencv_core244 \
-lopencv_highgui244 \
-lopencv_imgproc244
#-lopencv_features2d244 \
#-lopencv_calib3d244
}
unix{
#BOOST LIBRARIES. CHANGE TO YOUR OWN.
INCLUDEPATH += /home/panda/boost_1_51_0
#OPENCV LIBRARIES.IF YOU COMPILED AND INSALLED
#OPENCV FROM CMAKE & MINGW, JUST LEAVE IT BE,
#UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING.
INCLUDEPATH += /usr/local/include/opencv
INCLUDEPATH += /usr/local/include/opencv2
LIBS += -lopencv_core -lopencv_imgproc -lopencv_highgui
LIBS += -lopencv_ml -lopencv_video -lopencv_features2d
LIBS += -lopencv_calib3d -lopencv_objdetect -lopencv_contrib
LIBS += -lopencv_legacy -lopencv_flann
}
If this works, neither libgcc_s_sjlj-1.dll and libstdc++-6.dll is needed. However, the program still needs libstdc++-6.dll before I put it into .exe folder.
So my question is: Where can I get libgcc_s_sjlj-1.dll or is there any problem in my .pro file?

Answer 1

Bah, I am stupid. Your 'my program lacks libgcc_s_sjlj-1.dll, not libgcc_s_dw2-1.dll' should have rung a bell.
You compile with the wrong MinGW. There are several different exception handler for MinGW available: sjlj, dwarf, seh. Dwarf is 32bin only. When you have the libgcc_s_dw2-1.dll it means, you have a 32bit only MinGW installed.
You must compile your programs with the same MinGW, which was used to compile your Qt. The sjlj MinGW works for 32bit and 64bit so I suppose it makes sense that the qt-project provides binary packages, which were compiled with sjlj-MinGW.
There are some MinGW packages available, which allow you to choose, which exception handling mechanism you will use. Best choice is probably to use the MinGW, which is bundled in the Qt 5.1.1 installer packages.