Qt preprocessor definitions for build configurations

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QT

QT-Creator

In Visual Studio (C++ Express 2008) I can set pre-processor definitions by going to:

Project Settings - C/C++ - Preprocessor

and add them to Preprocessor definitions which I can then use in #ifdef statements in my code. This is useful to seperate out code for debug and release builds.

I.e.

#ifdef MY_BUILD_DEBUG
// Load test images
#else
// Open file dialog and browse to image folder
#endif

I'm struggling how to do this in QtCreator. I've tried putting the preprocessor definitions in:

Projects - Build Steps - QMake - Details - Additional Arguments

but they never get picked up in the #ifdef.

I've also tried doing this in the project .pro file which also doesn't work for me:

CONFIG(debug, debug|release){
message("debug, debug|release")
DEFINES += MY_BUILD_DEBUG
}

CONFIG(release, debug|release){
message("release, debug|release")
DEFINES += MY_BUILD_RELEASE
}

The strange thing here is that in the release build, the debugging output is 'debug, debug|release' only but the MY_BUILD_RELEASE definition is there since it picks it up in the #ifdef.

It's as if the DEFINES are added regardless of the build configuration, which is what I thought the CONFIG and braces was for.

Any ideas?