Garbage Collection is deprecated: Convert to Obj-C ARC

[fatuhoku]

Loading the project into Xcode 4.6.2, I get the warning:

Garbage Collection is deprecated; use the "Convert to Objective-C ARC" menu command to switch to Automatic Reference Counting

If you do as suggested

“Edit” -> “Refactor” -> “Convert to Objective-C ARC”

we reveal the real underlying problem of converting to ARC: that is,

Linked dylibs built for GC-only but object files built for retain/release for architecture x86_64

Can we realistically get rid of the warning, or is this something that cannot be changed because of the frameworks this project depends on?

[benoitsan]

Xcode still runs in GC and plugins have to be compiled with support for GC. So removing GC is not an option.