[iOS] Build Fails when Scheme is set to Release

[idibidiart]

Just changed the Scheme to Release based o the hint about disabling debug menu:
https://facebook.github.io/react-native/docs/debugging.html#debugging-react-native-apps

I get this error now with 0.14.2

Developer/Library/Frameworks'
Undefined symbols for architecture arm64:
  "_RCTSetLogFunction", referenced from:
      -[rnpocTests testRendersWelcomeScreen] in rnpocTests.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)```

[idibidiart]

Anyone else ran into this?

[stefanopiovesan]

I have the same issue. No errors with Debug, 2 errors in Release schema
Undefined symbols for architecture armv7: "_RCTSetLogFunction", referenced from: -[myrule1Tests testRendersWelcomeScreen] in myrule1Tests.o ld: symbol(s) not found for architecture armv7

[hasen6]

Getting this as well. No errors running in debug mode but have this error on release along with error "linker command failed with exit code 1 (use -v to see invocation)" in React Native 0.17

[hasen6]

Ok I had dead code stripping enabled to solve a previous error. But with this version, disabling it corrects these other errors and it builds successfully.

[Yukaii]

same issue as well...

[mattcollins]

I just hit this issue as well. After disabling dead code stripping (per @hasen6's comment), the build completed successfully.

Here's how I disabled it:

1. Opened XCode and pressed cmd + 1
2. Clicked on my project in the left panel, my target in the middle panel
3. Clicked on "Build Settings"
4. In the "Linking" section, under the "Dead Code Stripping" section, changed the setting for "Release" from "Yes" to "No"

This is just a workaround, but hopefully helpful if you're also hitting this.

[chenyu1520]

@mattcollins Nice!

[calvinf]

I ran into the same issue and had to disable dead code stripping, too.

[calvinf]

I found a solution to the problem in the comments for a previous issue:
#2685 (comment)

I believe this issue can be closed as a duplicate.

[janicduplessis]

@facebook-github-bot duplicate #2685

[facebook-github-bot]

@janicduplessis tells me this issue is a duplicate of #2685. Let's discuss there, closing this one.

[mileung]

@mattcollins Your solution doesn't seem to work on 0.29.0. I've also noticed that Facebook changed the docs for building app for production.

[longsangstan]

HI,
I have the same problem but
-it says architecture i386 instead of arm64
-it only happens when i choose iphone 5/4s simulators; other version such as 5s/6/6s don't have the problem

I tried the dead code stripping and add libReact.a to TESTS, both of them are not working for me.

Have anyone had the same problem?