AtariDreams wrote:

> Okay, your description of the change here is very misleading; it doesn't even 
> mention that this is specific to having an `@implementation` for every 
> intermediate class.
> 
> Your test seems completely inadequate — you need to test that we're doing the 
> static layout properly, and you need to test with ivars coming from a variety 
> of different places, including:
> 
> * ivars declared in the `@interface`
> * ivars declared in the `@implementation`
> * ivars synthesized explicitly in the `@implementation`
> * vars synthesized implicitly in the `@implementation`

So this is a way to check for static linked; if the compiler can see the 
@implementation, right?

Only then can we "opt-out" of the non-fragile ABI like NSObject and its 
subclasses do, right? 



https://github.com/llvm/llvm-project/pull/81335
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