Cannot build for ios RNScreen v4.11

[emmanuel-nike]

Description

I constantly get these errors

/Users/username/workspace/appName/node_modules/react-native-screens/ios/RNSScreenStackHeaderConfig.mm:39:49 Constexpr variable 'DEFAULT_TITLE_FONT_SIZE' must be initialized by a constant expression

/Users/username/workspace/appName/node_modules/react-native-screens/ios/RNSScreenStackHeaderConfig.mm:40:55 Constexpr variable 'DEFAULT_TITLE_LARGE_FONT_SIZE' must be initialized by a constant expression

Can anyone kindly help out? I cannot seem to find out why this is happening

react-native v0.76.9 react-native-screens v4.11.1 All react native navigation libraries are at the latest version as at the time of this post.

I have cleared/reinstalled pod, cleared derived data, cleaned project and rebuilt and still get the error. It only builds fine when I downgrade react-native-screens to v3.35.0

Steps to reproduce

1. Install the latest version of react-native screens
2. Navigate to the ios directory and run pod install
3. Attempt a build from xcode or run ios build from the command line.

Snack or a link to a repository

None

Screens version

4.11.1

React Native version

0.76.9

Platforms

iOS

JavaScript runtime

None

Workflow

None

Architecture

None

Build type

None

Device

iOS simulator

Device model

No response

Acknowledgements

Yes

[github-actions]

Hey! 👋

The issue doesn't seem to contain a minimal reproduction.

Could you provide a snack or a link to a GitHub repository under your username that reproduces the problem?

[kkafar]

@emmanuel-nike It seems that the issue you report is not reproducible neither on fresh RN project nor our example apps. This indicates that the issue is local & specific to your local configuration.

At the moment only thing that comes to my mind is an outdated Clang version. Could you please run clang --version & let us know the output (whole output, not just version)?

I'm on 17.0.0.

[Mbtdevd]

I got the same issue:
my clang version is:
Apple clang version 16.0.0 (clang-1600.0.26.6)
and I am using:

"react-native": "0.80.0-rc.3",
"react-native-screens": "^4.11.1",

Can you suggest what should I do now to resolve this issue?

[emmanuel-nike]

@emmanuel-nike It seems that the issue you report is not reproducible neither on fresh RN project nor our example apps. This indicates that the issue is local & specific to your local configuration.

At the moment only thing that comes to my mind is an outdated Clang version. Could you please run clang --version & let us know the output (whole output, not just version)?

I'm on 17.0.0.

This is my clang version:

Apple clang version 16.0.0 (clang-1600.0.26.6)

Maybe its really the clang issue. How do I update my clang version?

[emmanuel-nike]

Hello @Mbtdevd,

As a temporary fix, in the RNSScrrenStackHeaderConfig.mm I commented out lines 39 and 40 where the errors are being thrown and replaced the variable (DEFAULT_TITLE_FONT_SIZE) in line 478 with @17 and the variable (DEFAULT_TITLE_LARGE_FONT_SIZE) in line 505 with @34.

Then the project built fine.

[kkafar]

With @kligarski we've found that the syntax we're using is supported since XCode 13 and enabled by default (please see here: https://developer.apple.com/documentation/xcode-release-notes/xcode-13-release-notes#New-Features), for targets of iOS >= 14 (min supported version by screens is 15.1).

The compiler supports this flag with deployment targets of macOS 11, 
iOS and iPadOS 14, tvOS 14, watchOS 7 and later. The flag is enabled by default. 
To disable constant literals completely, use -fno-objc-constant-literals. 
To selectively disable specific constant literal optimizations use 
-fno-constant-nsnumber-literals, -fno-constant-nsarray-literals, 
and -fno-constant-nsdictionary-literals.

Please make sure that your deployment targets do align & that you do not pass -fno-objc-contsant-literals with compiler flags.

[emmanuel-nike]

Hi @kkafar,

My project targets iOS 13.4, I didn't find any information that suggests react-native-screens min supported version is 15.1. Thanks for this information and the assistance. I now have all I need to resolve this correctly.

[kkafar]

Since version 4.0 of this library we support react-native 0.76 or newer (table here) & since 0.76 react native has min deployment target at 15.1 for iOS (PR & reference here).

Glad we managed to figure it out.