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Does Qt Creator use the /GS (stack buffer overrun check), /DYNAMICBASE (address space layout randomization) and /NXCOMPAT (data execution prevention) when building a project with VC++ tools?
EDIT: Moved to tools, Gerolf
Which flags are used can be seen in:
<QtSDK Path>\Desktop\Qt\4.7.3\msvc2008\mkspecs\win32-msvc2005\qmake.conf
If you need different settings, just change it there (and perhaps recompile Qt).
If you only need these flags for your projects, set them in the .pro file.
Qt Creator does not set compiler settings itself. It uses those defined in your Qt installation (see Gerolf's post for the details).