glibc must match the linker so you would need a separate linker and the binaries usually have a hardcoded path to the system linker (and you need to binary patch the stuff - https://stackoverflow.com/questions/847179/multiple-glibc-li...)

So in practice you can only have 1 linker, 1 glibc (unless you do chroot or containers and at that point just build your stuff in Ubuntu 12.04 or whatever environment)