Just use your normal compiler when you want to compile for your architecture (g++) and when you want to compile for the PowerPC, use the PowerPC cross-compiler as you did above.
Just use your normal compiler when you want to compile for your architecture (g++) and when you want to compile for the PowerPC, use the PowerPC cross-compiler as you did above.
So your approach should be:
(1) Compile to run on your PC
(2) Test and debug
(3) Cross compile to Power-PC
(4) Run regression tests on Power-PC
So, you will still need access to a Power-PC. Even if you ran on a simulator, you'd should still do step (4) in case there are differences between the compiler/cross-compiler/simulator/real hardware.