the big changes ..
large model stuff is different ..
__int20 instead of an attribute(__int20__)
and passed arugments are reversed
old was r12,r13,r14,r15
new is r15,r14,r13,r12
so the .S files need some fix up
i wouldn't bother except the whole thing with the libc in msp430-elf-gcc being broken for months and no one cares got me to do something
i've only fixed the things need to make atoi work so i could see how much work it would be