maximedg reacted to rockets4kids in msp430-gcc 4.9.1 fails to build program that builds with 4.6.3
Have you gotten "hello world" to compile under the new toolchain? If not, that is where you want to start.
Most of your size issues are likely coming from newlib, not the compiler directly.
That said, I still have reservations about the new compiler so unless you need support for large memory or C++11 I suggest you stick with 4.6.3.