Though to some extent possibly putting a debian chroot onto an SD card might almost be enough. There are a few different attempts to start putting dev environments onto android (and then there's also the ipad as a devtool "buy a linode and ssh to it" method...)

but yeah, sadly even on some devices that means cracking/rooting them just to be able to properly chroot, but with that you'd at least have all the compilers you want and vim and/or emacs :P

Then we could start looking at bootstrapping more tools I suppose