The previous implementation used execv(2) to run the real interpreter, which means that
you cannot use the arch(1) tool to select the architecture you want to use for a
universal build because that only affects the python/pythonw wrapper and not the actual
interpreter.
The new version uses posix_spawnv with a number of OSX-specific options that ensure that
the real interpreter is started using the same CPU architecture as the wrapper, and that
means that 'arch -ppc python' now actually works.
I've also changed the way that the wrapper looks for the framework: it is now linked to
the framework rather than hardcoding the framework path. This should make it easier to
provide pythonw support in tools like virtualenv.
/usr/local by default. Users can still choose to install files into /usr/local, but by
default we'll only install files in /Library/Framework/Python.framework and
/Applications/Python X.Y/
for the machine ("i386" or "ppc"), even if the executable is
64-bit.
This patchs ensures that the distutils platform architecture
represents the architecture for the executable when running a
64-bit only executable on OSX.
