Re: [avr-libc-dev] C11 Atomics and GCC libatomic

[Georg-Johann Lay]

Jacob Moroni schrieb:
> Got it. I'll add the support to GCC's libatomic then send it in. Thanks.

Here is some introduction on contributing to GCC:

http://gcc.gnu.org/contribute.html

As it is hard to follow discussions in top-posting style, that style is 
usually voided :-)

https://en.wikipedia.org/wiki/Posting_style#Top-posting

> On Jun 25, 2016 5:13 PM, "Joerg Wunsch" wrote:
>
> > As Georg-Johann Lay wrote:
> >
> > > As libatomic will need close cooperation with the compiler, I'd
> > > recommend to add it to GCC.
> >
> > That would be my recommendation, too.  If it's a compile feature,
> > it would better be there.  Perhaps it's then even possible to find
> > a more efficient implementation (no function call overhead).
> >
> > cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL

There are quite some standard insns for atomics known to gcc, cf. 
"atomic_" insns in

http://gcc.gnu.org/onlinedocs/gccint/Standard-Names.html

This can avoid overhead of function calls.  But I still don't see the 
great advantage of using stdatomic over the "classical" util/atomic.h 
from avr-libc.  For C++ we don't have portability because there is no 
libstdc++ generated for avr, not even libsupc++...

Johann