ld: warning: Linker asked to preserve internal ... |Apple Developer Forums

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Latest reply on Jun 8, 2018 10:34 AM by ingconti

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mindthefrog Apr 10, 2017 10:51 AM

I have a project which links with 3rd party SDKs (AdMob and others). With Xcode 8.3.1, I get the following linker warnings when building the archive that gets uploaded to iTunes Connect (Xcode: Product -> Archive):

ld: warning: Linker asked to preserve internal global: '__block_descriptor_tmp'

ld: warning: Linker asked to preserve internal global: '__block_literal_global'

The last time I updated the app, I was using an older version of Xcode and didn't see any linker warnings.

Is this warning due to the 3rd party SDKs having been built with an older version of Xcode?

Is it something to worry about?

Re: ld: warning: Linker asked to preserve internal global

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mindthefrog Apr 13, 2017 6:12 AM (in response to mindthefrog)

In case someone runs into the same problem, I just wanted to write an udpate: I haven't found a way to get rid of the warnings, but the app update in question went through the review process and is live on the app store with no reported issues.
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- Re: ld: warning: Linker asked to preserve internal global
  
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  JJAZAD LLC Apr 6, 2018 9:35 AM (in response to mindthefrog)
  
  Thank you , very helpful.
  
  JZ
  
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Re: ld: warning: Linker asked to preserve internal global

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FlatDog Apr 14, 2017 9:02 AM (in response to mindthefrog)

I've got the same problem! Trying to submit a build to Apple now, fingers-crossed!
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Re: ld: warning: Linker asked to preserve internal global

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Groovietunes Apr 14, 2017 11:09 PM (in response to mindthefrog)

Would you guys happen to be using Firebase? Curious if this is at all related to the issues they were having with xcodes release of 8.3. http://stackoverflow.com/questions/42268117/how-to-remove-the-xcode-warning-apple-mach-o-linker-warning-pointer-not-aligned/42448144 Warning seem similar. Those errors were fixed the other day with Firebase 3.16, and no errors when I build. I'm only getting these errors when I try to archive.
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- Re: ld: warning: Linker asked to preserve internal global
  
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  pkclsoft Apr 15, 2017 11:34 PM (in response to Groovietunes)
  
  Yes, I believe it has to be Firebase relaed.
  
  I thought it was related to the way that cocaopods installed it all, so I started fresh, installing the minimum myself manually. All good, all running, and now those 3 warnings are back,
  
  ld: warning: Linker asked to preserve internal global: '__block_descriptor_tmp'
  ld: warning: Linker asked to preserve internal global: '__block_literal_global'
  ld: warning: Linker asked to preserve internal global: 'sharedInstance.sharedInstance'
  
  I haven't been able to solve this myself. I've manually installed Firebase 3.16, but that made no difference.
  
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Re: ld: warning: Linker asked to preserve internal global

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Groovietunes Apr 15, 2017 1:12 AM (in response to mindthefrog)

Definitely AdMob related, built a fresh xcode project and the problem did not occur unitl archiving, after pod installing 'Firebase/AdMob'
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- Re: ld: warning: Linker asked to preserve internal global
  
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  tatare99 Apr 19, 2017 12:17 PM (in response to Groovietunes)
  
  I have the same issue...
  
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Re: ld: warning: Linker asked to preserve internal global

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lml May 11, 2017 2:13 PM (in response to mindthefrog)

Same issue here. Updated CocoaPods (Firebase and AdMob) before archiving, and received same build warnings.
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Re: ld: warning: Linker asked to preserve internal global

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roeeNamde May 15, 2017 5:58 AM (in response to mindthefrog)

I have the same issue... Anyone have a solution? ?
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Re: ld: warning: Linker asked to preserve internal global

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acbc Jun 9, 2017 6:29 PM (in response to mindthefrog)

Same here (possibly firebase). Sending it to review like that. (crossing fingers).
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Re: ld: warning: Linker asked to preserve internal global

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OldNick Jun 29, 2017 1:55 AM (in response to mindthefrog)

Hi !
After importing the AdMob SDK, when I archived my project ( workspace), I had the following warning : ld: warning: Linker asked to preserve internal global: '__block_descriptor_tmp'
I've found a way to get rid of it: Target \ Build Settings \ Build Options \ Enable bitcode = NO
Hope this help !
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- Re: ld: warning: Linker asked to preserve internal global
  
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  ingconti Jun 8, 2018 10:34 AM (in response to OldNick)
  
  I got it onky after adding adMobs
  
  I really want to know WHY google releases such bugged, undocumented and messy SDKs...
  
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