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Bug
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    Resolution: Out of scope
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P3: Somewhat important
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    4.3.0
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    None
 
When trying to remove the RTTI flag from the generated Xcode project (QMAKESPEC=macx-xcode), then the following has no effect:
CONFIG -= rtti 
QMAKE_CXXFLAGS += -fno-rtti
The generated Xcode project will still have the "Enable C++ Runtime Types" setting enabled.
With QMAKESPEC=macx-g++, setting "QMAKE_CXXFLAGS += -fno-rtti" generates a Makefile that has the -fno-rtti compiler option, but "CONFIG -= rtti" does not affect the Makefile.