View Full Version : Developing 64 bit applications with Qt

1st October 2009, 11:41
I am having a big 32 bit Visual C++ 6 based application. I am in the processing of porting it to 64 bit application running on 64 bit OS (64 bit machine). How easy/ difficult it can be if I completely do it with only Qt alone (not Visual C++)? I am considering Qt as there can be an option of running it as a Windows (32/ 64 bit) or Linux (32/ 64 bit) application. This application involves connectivity to database which is again going to be residing on 64 bit platform. Any issues developing 64 bit applications with Qt ? pls post your comments if there any related to this. thanks.

1st October 2009, 11:49
No issues. Just build Qt and the application with a 64 bit compiler.

1st October 2009, 12:02
What it works is the other way : compile in 32bits on a 64 bits machine by settings makefile flags :


After ensuring yourself that the libs you link against are compatibles.