arc/orc is broken for vcc (devel)

[rockcavera]

What happened?

The compiler fails with an error when trying to compile using arc/orc any simple code such as an echo "hello". This error only appears using --cc:vcc.

Nim Version

Nim Compiler Version 1.7.3 [Windows: amd64]
Compiled at 2022-11-17
Copyright (c) 2006-2022 by Andreas Rumpf

git hash: 68f6926
active boot switches: -d:release

Current Standard Output Logs

nim c --cc:vcc -f --mm:arc test
Hint: used config file 'E:\Nim\config\nim.cfg' [Conf]
Hint: used config file 'E:\Nim\config\config.nims' [Conf]
....................................................
E:\Nim\lib\system\alloc.nim(768, 19) template/generic instantiation of `atomicPrepend` from here
E:\Nim\lib\system\alloc.nim(762, 16) template/generic instantiation of `storea` from here
E:\Nim\lib\system\alloc.nim(145, 36) Error: undeclared identifier: 'atomicStoreN'
candidates (edit distance, scope distance); see '--spellSuggest':
 (4, 3): 'atomicLoadN' [proc declared in E:\Nim\lib\system\atomics.nim(192, 8)]
 (4, 3): 'atomicStatDec' [template declared in E:\Nim\lib\system\alloc.nim(155, 10)]
 (4, 3): 'atomicStatInc' [template declared in E:\Nim\lib\system\alloc.nim(156, 10)]

With --threads:off the error message is different.

nim c --cc:vcc -f --mm:arc --threads:off test
Hint: used config file 'E:\Nim\config\nim.cfg' [Conf]
Hint: used config file 'E:\Nim\config\config.nims' [Conf]
..............................................
E:\Nim\lib\system\alloc.nim(768, 19) template/generic instantiation of `atomicPrepend` from here
E:\Nim\lib\system\alloc.nim(763, 10) Error: undeclared identifier: 'atomicCompareExchangeN'
candidates (edit distance, scope distance); see '--spellSuggest':
 (10, 4): 'interlockedCompareExchange8' [proc declared in E:\Nim\lib\system\atomics.nim(254, 10)]

Expected Standard Output Logs

It is expected to compile without problems.

Possible Solution

No response

Additional Information

I believe it is connected with this #20492

[ringabout]

It seems that vcc(C compiler) lacks some basic atomic operations. atomicStoreN, atomicCompareExchangeN and atomicExchangeN needs to be implemented. Alternative is to switch to std/concurrency/atomics