The code executable cannot continue: libgcc_s_seh-1.dll was not found - qt

Question

I have a problem that I cannot solve, When I run the executable of my program it gives me the following error:
The code executable cannot continue because libgcc_s_seh-1.dll was not found. To fix the problem, try reinstalling the program
I tried to manually copy and paste the file (libgcc_s_seh-1.dll) into the folder where I keep the executable but I get the following error:
The application could not be started correctly (0xc000007b)
Additional information:
I use windows 10 64 bit
I Use mingw81_64
I use version 6.1.2 of Qt
What can I solve the problem?

Answer 1

I guess you double-clicked in exe file that provides after building in release mode :
For Deploy and create Exe output with QT in windows you should follow this way:
put your compiler path in your system path. now you use mingw81_64 you should set it. something like Qt/tools/mingw81_64/bin
copy exe file that provides after building in release mode in one folder and run mingw81_64 cmd (it has separate cmd)
and cd to that folder path
windeployqt app.exe
This command will get all dll needs for your app and your exe will work .
if you use qml
windeployqt --qmldir (the path of its directory ) app.exe
and also see these youtube videos for more info:
https://www.youtube.com/watch?v=LdSTgR0xJco
https://www.youtube.com/watch?v=hCXAgB6y8eA

Answer 2

For specific error of libgcc_s_seh-1.dll was not found, please try to copy libgcc_s_seh-1.dll, libstdc++-6.dll, libwinpthread-1.dll into your compiler path like Qt/tools/mingw81_64/bin.

Answer 3

You should copy libgcc_s_seh-1.dll, libstdc++-6.dll, libwinpthread-1.dll into your exefile path after executing windeployqt.exe with all files are in correct version.