See the qmake manual.
I also have Qt Creator 1.3.0 and MinGW, and note QMAKE_CXXFLAGS_WARN_ON
that the variable seems to have a -Wall value. There are a number of QMAKE_CXXFLAGS variables .... They can be set / changed / adjusted in your * .pro file.
eg. in myproject.pro
win32: QMAKE_CXXFLAGS_WARN_ON + = -Wextra
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