Hi,

I try to convert my app to use xCode 4.2 and ARC. My app uses several custom 
frameworks and plugins. I used the migration tool to enable ARC for all of them.

As I still want to support Snow Leopard, I set the SDKROOT to 10.7 and the 
Deployment Target to 10.6. But if I do that, on the startup of the app, I get 
this in the console: 

objc[9438]: Class __ARCLite__ is implemented in both [..]framework1 and 
[..]framework2. One of the two will be used. Which one is undefined. // removed 
the paths to frameworks...
objc[9438]: Class __ARCLite__ is implemented in both [..]framework1 and 
[..]framework3. One of the two will be used. Which one is undefined.
objc[9438]: Class __ARCLite__ is implemented in both [..]framework1 and 
[..]framework4. One of the two will be used. Which one is undefined.

In the beginning I had only a few but now after converting all of my bundles 
(around 20) I have 10 lines of those. The ARCLite stuff seems to be the 
implementation to get ARC to work on Snow Leopard.

That should not be a problem. BUT I also get this:

2012-02-02 23:35:54.057 Glyphs[9438:1803] *** NSInvocation: warning: object 
0x1006db648 of class '__ARCLite__' does not implement 
methodSignatureForSelector: -- trouble ahead
2012-02-02 23:35:54.057 Glyphs[9438:1803] *** NSInvocation: warning: object 
0x1006db648 of class '__ARCLite__' does not implement doesNotRecognizeSelector: 
-- abort

And this just crashes the app. Does anyone has a clue what is going on here? 
google is not very helpful.

If I use 10.7 as the deployment target non of this happens and the app runs 
fine on Lion.

Thanks
Georg


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