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Xcode Apple Mach-O Linker (id) Warning

I have this app with 0 errors and warnings when I run it on my device. But when I try to archive it for iTunes Connect I get all these weird ones Apple Mach-O Linker (id) Warnings

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There are two types of warnings:

  • Linker asked to preserve internal global: '__block_descriptor_tmp'

  • Linker asked to preserve internal global: '__block_literal_global'

And the craziest part is that I get 402 of these warnings! enter image description here

I have a suspicion that these errors may occur or are related to the Derived Data folder of my application. I tried removing it, but the errors just came back.

Do you think it's safe to just ignore the warnings and upload them to the App Store?

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2 answers


In case anyone is facing the same issue, I just wanted to write udpate: I didn't find a way to get rid of the warnings, but the said app update went through the review process and app store without messages. This is a known issue with Firebase upstream.



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It has something to do with Firebase and bitcode. They go away if you set the parameter Enable bitcode

to false.



enable bitcode

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