arm none-eabi to LLVM upgrade

Hi Experts,

I am using arm none-eabi version 4.5.1 for code compilation.

Is it recommended to upgraded to Clang + LLVM compiler ?

How far it is matured for bare metal code (cortex M and R profiles) ?

Which one is good for baremetal C++ code development ? GCC or LLVM + Clang ?

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