qt creator debug slow

Question

I'm running Qt Creator 2.3.0, based on Qt 4.7.4, on Windows 7 64-bit. When I run the app from Qt Creator (ctrl+r), everything works great. However, when I debug (F5), executing each line takes forever - as in sometimes 2 minutes to execute a single line of code.

I noticed in the Debugger Log window this line: Debugger: C:\Program Files (x86)\Debugging Tools For Windows (x86)\cdb.exe. I thought since I'm running Windows 7 x64, I should be using the 64-bit debugger. So, I downloaded and installed the Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 SP1 as a friend suggested.

Now I see that in Tools..Options..Tool Chains, I have a number of Auto-detected tools. If I select any of the Microsoft Windows SDK for Windows - x86, x64, ia64, or any of the Microsoft Visual C++ Compiler 9.0 - x86, amd64, x64, ia64 - the Debugger is set to "C:\Program Files (x86)\Debugging Tools For Windows (x86)\cdb.exe", and is disabled so I can't change it.

How do I convince Qt Creator to use the 64-bit version of cdb? Is that related to my major problem, the super-slow debugging?

Answer 1

After installing Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 SP1, I upgraded to Qt Creator 2.4. Now when I debug, it started using x64 cdb! The first couple times were still very slow for some reason. However, when I tried to time it, it's now working at a reasonable speed. Even after re-starting Qt Creator or even rebooting, debugging is now running at a reasonable speed: maybe 2-3 seconds to bring up my main form the first time, and 1 second thereafter. Used to take anywhere from a minute to 20 minutes.

So it's working now! Hope this is helpful to someone.

Answer 2

I'm using qt-creator 2.5.2, lib 4.8.3 msvc2010, under windows7-64bit, also is too slow,
even after I had download the debug symbols as cache.

but it's solved now, refer: How to configure CDB in Qt Creator?

I clone one config, change from default detect: C:\Program Files\Debugging Tools for Windows (x64)\cdb.exe

to new install: C:\Program Files (x86)\Windows Kits\8.0\Debuggers\x86\cdb.exe