[cfe-dev] [libcxx]: std::atomic for cortex-m3 - ARMv7-M

[salvatore benedetto]

Hi there,

I'm trying to use std::atomic<> for a cortex-m3 target (ARMv7-M Thumb-2),
but it seems not to be supported (It compiles OK on my x86_64 host).

 error: cannot compile this atomic library call yet
        {return __c11_atomic_fetch_sub(&this->__a_, __op, __m);}
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I wonder where I can find more information about this subject.
Is anyone working on adding support for this? Or is it even possible
since, from what I know, ARMv7-M provide special instruction that only
works on special memory area (bit-band)?

Thanks in advance.

Regards,
Salvatore