32-bit Qt application on win 7 x64 won't run, but runs fine from Qt Creator?

Question

My development box is Windows 7 x64. I have both 32-bit and 64-bit versions of Qt 4.7.4 built on my box. When I configure my app to use the 32-bit version of Qt, it runs f

Answer 1

Simply add the three missing dll files:

• libwinpthread-1.dll
• libstdc++-6.dll
• libgcc_s_dw2-1.dll

to the folder of appl.exe . For my system, that would be into the directory C:\Users\H\Documents\build-AQtest01v4-Desktop_Qt_5_11_0_MSVC2017_64bit-Debug. Copying those libraries should make your application work. On my system those dlls can be found in C:\Qt\Tools\mingw492_32\bin.