[arch-general] STM32 compilation on ArchLinuxARM

[Konstantin Gribov]

>
> RPi 2 B is Armv7. IIRC.
> Idk about 3, But I think it is ArmV7

RPi3 is armv8-a (it has Cortex-A53 cores), not armv7-a. But it's offtopic.

OP's question was about cross-compiling for Cortex-M which is for
microcontrollers. He just wants to compile code for it on RPi as a host.
It's not very different from compiling for Cortex-M on x86_64.
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Best regards,
Konstantin Gribov