ldd for the 32 bit version returns:
$ ldd hello32
linux-gate.so.1 => (0xf777c000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf75b5000)
/lib/ld-linux.so.2 (0xf777d000)
for the 64 bit version:
$ ldd hello64
linux-vdso.so.1 => (0x00007fffc03fe000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbf5ac88000)
/lib64/ld-linux-x86-64.so.2 (0x00007fbf5b064000)