React-native-config: Cant build witch Xcode 12

[SuperDuperMartin]

Xcode 11 worked perfectly, but when downloading Xcode 12 today build stopped working.
Following error is given:
:1:10: fatal error: '/Users/martinagnalv/Library/Developer/Xcode/DerivedData/Veckopengen-gvcjpitunusuppdhjbhqnelgdjra/Build/Products/GeneratedInfoPlistDotEnv.h' file not found

include "/Users/martinagnalv/Library/Developer/Xcode/DerivedData/Veckopengen-gvcjpitunusuppdhjbhqnelgdjra/Build/Products/GeneratedInfoPlistDotEnv.h"

     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1 error generated.
Command Preprocess failed with a nonzero exit code

[sunweiyang]

I'm also getting this error (only when trying to build for a simulator; building for a real device works fine).

I'm on react-native-config 1.3.3, and I can confirm that I have done the following:

* Go to your project -> Build Settings -> All
* Search for “preprocess”
* Set `Preprocess Info.plist File` to `Yes`
* Set `Info.plist Preprocessor Prefix File` to `${BUILD_DIR}/GeneratedInfoPlistDotEnv.h`
* Set `Info.plist Other Preprocessor Flags` to `-traditional`

[sunweiyang]

I don't know if it will help anyone else, but after I changed valid and excluded architectures in project.pbxproj, I was able to build. Basically, I included x86_64 and excluded arm64.

These links pointed me in the right direction for both:

https://stackoverflow.com/questions/63607158/xcode-12-building-for-ios-simulator-but-linking-in-object-file-built-for-ios

https://github.com/CocoaPods/CocoaPods/issues/10059#issuecomment-695876995

[SuperDuperMartin]

@sunweiyang thank you for this!! Gold!!

[AnthonyTailer]

I'm trying to Upgrade from React Native 0.61.5 to 0.63.3 and from XCode 11 to Xcode 12 too, but no success.
I've tried the @sunweiyang suggestions. No lucky.

I'm trying to update react-native-config from 1.2.1 to 1.3.3
I'm still getting GeneratedInfoPlistDotEnv.h file not found

These are my configs:

[yberstad]

@AnthonyTailer, I'm having the same issue, trying to upgrade from React Native 0.61.2 to 0.63.3 and I'm using Xcode 12. Did you find a solution to this issue?

[toytonic]

Same issue here. So far it only happens when building with circleci

[AnthonyTailer]

@AnthonyTailer, I'm having the same issue, trying to upgrade from React Native 0.61.2 to 0.63.3 and I'm using Xcode 12. Did you find a solution to this issue?

@yberstad Sorry for not getting back to you sooner. But in my case it's was a problem with my Gems. I installed cocoapods with Bundler so I just update the cocoapods by running bundle update cocoapods. https://guides.cocoapods.org/using/a-gemfile.html

[yberstad]

@AnthonyTailer, thanks for getting back at me! No worries, I solved the issue, from what I recall there was some config issue on my side.