Swig-generated files do some type punning that the gcc compiler will complain 
about when optimizing. This has been partially taken care of with 
fixCFlagsForSwig function in SConstruct. However, there are two remaining 
problems: 
1- The function sets -fno-strict-aliasing only on CCFLAGS, whereas swig is 
generating c++ code. It should be setting CXXFLAGS (both?).
2- The python wrapper environment is not passed through this function.

-- 
Felipe Sateler