gcc compiler

Which gcc compiler release had the Arm 9 multicore support?Whether the compiler that used for the single Arm 9 core can be used for its multicore systems ?

If gcc not support,please tell me which are the compilers that are available for Arm 9 multicore systems (including commerical).Whether gcc debugger and its profiler provide the performance evaluation of each threads that runs in both core?If not tell me the commerical tools that helps in the performance evaluation of threads in each core