[openal] Questioning about linking to OS X 10.4 SDK

Chris Robinson chris.kcat at gmail.com
Tue Nov 4 20:59:56 EST 2014

On 11/04/2014 10:48 AM, Lubo Diakov wrote:
> Hello, I've compiled openal-soft version 1.15.1 (both from the
> MacPorts package and from source tarball) on OS X 10.5, using the 10.5
> SDK. However, I'd liike to link it to the 10.4u SDK and I can't do
> that.
> It links to a symbol not in the 10.4u SDK (more specifically, the
> symbol _OSAtomicCompareAndSwapPtrBarrier is in the 10.5 SDK, and there
> is corresponding symbol in the 10.4u SDK, but they have to be called
> in a slightly different way from the code.

Starting with 1.16, OpenAL Soft doesn't use OSX's OSAtomic methods 
because they're too inflexible (in particular, OSAtomicCompareAndSwap* 
doesn't report what the checked value was like every other API does; it 
only returns if the compare/swap was successful or not). Instead, it now 
only uses C11's atomic methods if available, otherwise falling back to 
GCC intrinsics (works on Clang too), or x86/x86_64 inline assembly. Or 
Windows' methods, but OSX obviously won't have those.

AFAIK, OSX uses a version of GCC or Clang, so it should still work with 
either the intrinsics or inline assembly. Otherwise, bringing back the 
OSAtomic calls will require finding some way around CompareAndSwap's 

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