qt application 64 bit windows

Question

Hi,

Is it possible to compile a 64 bit executable in qt windows. Is it the same process as with 32 bit or any different.

Brgds,

kNish

Answer 1

Have a look at this wiki page. I describes how to build the Qt binaries from source for different configurations.

Answer 2

I'm not sure if I understand your question completely, but I can tell you about my project and see if it helps your situation.

We have:

1. Visual Studio 2008 C++ project
2. Contains both Win32 and x64 platforms (in other words, it can be 32-bits or 64-bits)
3. We save the original Qt libraries that came with the Qt installer in one directory (e.g. Qt/lib/x32), and re-built Qt as 64-bits and save that in another directory (e.g. Qt/lib/x64).
4. When it comes to linking, we just ensure that we link with the correct library (32-bit platform links to 32-bit Qt, and so on).

This has worked quite well for us.

So if I had to guess the answer to your question.

Yes, it's possible to compile a 64-bit executable in Qt on Windows. It's the same process, except you have to tell the qmake a little bit different parameter. See Frank Bollack link above on how to build it.

Note, if you app is 64-bit (x64), and you try to link 32-bit Qt (the one that came with the installer), it will not link.

Hope this helps.