paging the macports devs about NSObject between Lion and Mountain Lion

[Gagan Sidhu]

hi team,

first of all, i just built the clang-18 properly and wow am i amazed. here i was asking about wasm and stuff, i should have been a little more thorough, my bad.
	-really this thing is a work of art. great yob

now to my question, which i also posted to stackexchange(https://stackoverflow.com/questions/78602533/using-nsobject-with-modern-os-x-sdk-14-4-and-10-7-macosx-deployment-target)

briefly: the NSObject class moved from the runtime to Foundation from Lion to Mountain Lion.

so there is a little bit of a “hole” in trying to compile for a 10.7 target using an SDK that is >=10.8:

> ld64.lld: error: undefined symbol: OBJC_CLASS_$_NSObject
> >>> referenced by /Users/Gagan/Downloads/mozilla-unified/toolkit/mozapps/update/updater/launchchild_osx.mm
> >>>               launchchild_osx.o:(symbol OBJC_CLASS_$_ElevatedUpdateServer+0x8)
> >>> referenced by /Users/Gagan/Downloads/mozilla-unified/toolkit/mozapps/update/updater/progressui_osx.mm
> >>>               progressui_osx.o:(symbol OBJC_CLASS_$_UpdaterUI+0x8)
> 
> ld64.lld: error: undefined symbol: OBJC_METACLASS_$_NSObject
> >>> referenced by /Users/Gagan/Downloads/mozilla-unified/toolkit/mozapps/update/updater/launchchild_osx.mm
> >>>               launchchild_osx.o:(symbol OBJC_METACLASS_$_ElevatedUpdateServer+0x8)
> >>> referenced by /Users/Gagan/Downloads/mozilla-unified/toolkit/mozapps/update/updater/launchchild_osx.mm
> >>>               launchchild_osx.o:(symbol OBJC_METACLASS_$_ElevatedUpdateServer+0x0)
> >>> referenced by /Users/Gagan/Downloads/mozilla-unified/toolkit/mozapps/update/updater/progressui_osx.mm
> >>>               progressui_osx.o:(symbol OBJC_METACLASS_$_UpdaterUI+0x8)
> >>> referenced 1 more times
> clang++: error: linker command failed with exit code 1 (use -v to see invocation)


usually it will say something like this because, as is obvious to this educated and sharp crowd, the >=10.8 objc runtime will not have NSObject like 10.7, and thus there is no framework we can link for a 10.7 target to get NSObject.

have any of you vets dealt this issew? is there a simple way? i haven’t thought too hard about trying to use an OSObject but i’m open to alternatives.

maybe duplicating the class and renaming any usage with a macro? i was hoping for sokmething cleaner tho.

Thanks,
Gagan