Xcode 14 beta. Can not Not link _objc_msgSend about zld

[keith]

You can pass -fno-objc-msgsend-selector-stubs to your compiles to avoid this

[michaeleisel]

Perhaps I'll just make that the default for now

[keith]

You have to do that to clang for each object compile, not ld unfortunately

[michaeleisel]

Do you know if lld has a plan for fixing this?

[keith]

I started looking at it this morning, not sure how far i'll get

[aleksandergrzyb]

👋, is there any progress regarding this issue? 👀

[keith]

Sorry to be clear I started working on this for LLD, tracked here llvm/llvm-project#56034, for zld to get this it would either require @michaeleisel to implement it entirely, or apple to update their open source dump of ld64 and zld rebase on it. I would suggest disabling it with -fno-objc-msgsend-selector-stubs in the meantime

[michaeleisel]

i may just turn that flag on by default

[michaeleisel]

oh wait, right, it's a clang flag, not an ld one

[PhilCai1993]

I noticed that even if you put -fno-objc-msgsend-selector-stubs for all clang invocations, if -miphoneos-version-min=8.0 is presented in the linker command, the _objc_msgSend issue will happen too.

The linker passes after changing the flag to -miphoneos-version-min=10.0

[michaeleisel]

so, my plan is that i will not be fixing this bug. instead, i will detect when it occurs, and in the error message tell the user either to add the -fno-objc-msgsend-selector-stubs flag to their compilations, or else switch to lld. i am working with the lld people to make user-friendly lld install docs to send people to

[michaeleisel]

1.3.6 has a better error message for this, including a link to the new mach-o lld docs