How can I use GCC compiler on Mbed Studio (0.5.3) ?
The compiler can’t be changed. Current Mbed Studio uses Arm Compiler 6.
I apologies for keeping you without an answer for such a long time.
@Pekka01 is correct. At the moment Mbed Studio is shipped only with Arm Compiler 6.11 and it is impossible to switch to GCC_ARM.
That being said we are investigating bringing support also for GCC_ARM compiler (first versions of Mbed Studio were supporting both ARMC6 and GCC_ARM). No final decision is made about it yet.
Arek - Mbed Studio team