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Bug 5357

Summary: SDL2 won't compile for Apple Silicon on macOS Big Sur
Product: SDL Reporter: Tom Kidd <tomkidd>
Component: atomicAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.12   
Hardware: x86   
OS: Other   

Description Tom Kidd 2020-11-19 04:22:40 UTC 
This is not a completely immediate concern since for the time being Apple Silicon running Big Sur can still run x86_64 code, but when I try and build a version of SDL 2.0.12 for "Any Mac (Apple Silicon, Intel)" the build fails. 

The line failing is in SDL_Spinlock.c, line 107, because it can't find the function named OSAtomicCompareAndSwap32Barrier.

My guess is that since this function was deprecated a few versions back, when they made the Apple Silicon version of Big Sur they just didn't bother implementing deprecated methods. The header file says something about using std::atomic_compare_exchange_strong but I'm not versed enough to know how to just drop that in. 

Anyway, thought you guys might like to know.
Comment 1 Sam Lantinga 2020-11-24 05:23:07 UTC 
Is this fixed in the latest snapshot?
http://www.libsdl.org/SDL-2.0.zip
Comment 2 Tom Kidd 2020-11-25 22:41:18 UTC 
My mistake - despite my best efforts to keep everything situated, somehow I was using a 2.0.10 source code snapshot instead of 2.0.12. 

It compiles correctly in 2.0.12 as well as the latest snapshot.
Comment 3 Sam Lantinga 2020-11-26 01:58:02 UTC 
Glad to hear it. :)