[Qt-creator] Cannot override default CXXFLAGS

[Charles N Burns]

I cannot figure out how to override Qt Creator's CXXFLAGS setting. I
tried adding this to the .PRO:

    QMAKE_CXXFLAGS += -fno-rtti -fno-exceptions

This does not work because the defaults include "-frtti -fexceptions"
and these appear after QMAKE_CXXFLAGS on the command line, so they
override the flags even when I specify them. The actual flags used
according to the compiler output are:
    g++ -c -fno-rtti -fno-exceptions -O2 -frtti -fexceptions -mthreads
-Wall [...]

Using RC-1