QT versions, kits and compilers

Question

I am new in QT and was wondering what is the difference between QT versions, kits and compilers. In my "Build & Run" tab are avilable:

Kits:

• Desktop Qt 5.4.2 MSVC2013 64bit2
• Desktop Qt 5.5.0 MSVC2013 64bit

Qt Versions:

• Qt 5.4.2 MSVC2013 64bit2 and some qmake.exe path
• Qt 5.5.0 MSVC2013 64bit and some qmake.exe path

Compilers:

• Microsoft Visual C++ Compiler 12.0(x86)
• Microsoft Visual C++ Compiler 12.0(amd64)
• Microsoft Visual C++ Compiler 12.0(x86_amd64)
• Microsoft Visual C++ Compiler 12.0(x86_arm)
• Microsoft Visual C++ Compiler 12.0(amd64_arm)
• Microsoft Visual C++ Compiler 9.0(x86)
• Microsoft Visual C++ Compiler 9.0(x86_amd64)
• Windows Mobile 5.0 Pocket PC SDK (ARMV4I)
• Windows Mobile 5.0 Smartphone SDK (ARMV4I)

I tried to link tesseract 3.02 with QT(I have linked it with Visual Studio 2013 successfuly before that) but very strange errors like below appeared:

But then I have remembered in VS 2013 this was becouse of the use of 32 bit libs in 64 bit compilation. The Qt setup I have downloaded is "qt-unified-windows-x86-2.0.2-2-online.exe" i.e. it is 32 bit. And now I am very comfused - what bits I am using right now for my project 64 or 32, what is the difference between 64bit and 64bit2, which must be 32 bit - the compiler, the qt version or the kits. If someone can give simple explanation together with for what are kits,qt version and compilers used(of course I know what is compiler, but cant get the reference between SDK and compiler).

Answer 1

Qt versions are Qt packages that you download from digia (libraries, source code, documentation, etc...), compilers are the compilers you have on your machine and kits are valid combinations of these two.

In your case you have:

• Qt 5.4.2 64bit
• Qt 5.5.0 64bit
• Msvc both 32bit and 64bit

you can combine the two Qt versions (that are 64bit) with the 64bit version of the msvc compiler, but not with its 32bit version.