Unresolved external in react-native project using stripe-ios

[djMax]

Summary

While trying to compile a project using react-native and SDK version 21.1.0, I get this error:

Undefined symbols for architecture x86_64:
"(extension in Foundation):__C.NSScanner.scanUpToString(Swift.String) -> Swift.String?", referenced from:
static Stripe.STPPhoneNumberValidator.formattedRedactedPhoneNumber(for: Swift.String, forCountryCode: Swift.String?) -> Swift.String in libStripe.a(STPPhoneNumberValidator.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Code to reproduce

I have not produced a standalone test yet, but it seems this happens on a vanilla RN project.

iOS version

13, 14

Installation method

CocoaPods

SDK version

21.1.0

Other information

I am trying to use the Stripe SDK from a swift file in a react-native app, which is likely somehow related.

[djMax]

Any thoughts on this one, or things you'd like me to do to follow up? If I modify this code in STPPhoneNumberValidator:

    if #available(iOS 13.0, *) {
      prefix = scanner.scanUpToString("*") as NSString?
    } else {
      #if !TARGET_OS_MACCATALYST
      scanner.scanUpTo("*", into: &prefix)
      #endif
    }

to essentially remove the use of scanUpToString, it compiles and functions.

    if #available(iOS 13.0, *) {
      scanner.scanUpTo("*", into: &prefix)
    } else {
      #if !TARGET_OS_MACCATALYST
      scanner.scanUpTo("*", into: &prefix)
      #endif
    }

It really does seem like it SHOULD work as is, and perhaps is somehow related to ios version targets (I've tried setting them but that didn't help, but I know there are 50 places it might belong).

[djMax]

This seems to be the issue, though I can't claim to understand it.

react-native-community/upgrade-support#62 (comment)

[davidme-stripe]

Thanks for the detailed report! From the linked issue, it looks like React Native may be compiling against the wrong version of the Swift standard library. I'll investigate.

[davidme-stripe]

I still can't reproduce this locally, but it seems like the linked workaround of removing "\"$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)\"" from the LIBRARY_SEARCH_PATHS build configuration setting is working.

[jp928]

@davidme-stripe
I removed all entries in LIBRARY_SEARCH_PATHS

then react-native-linear-gradient failed in build.

Library not found for -lBVLinearGradient

[davidme-stripe]

I believe React Native has fixed this on their end — they shouldn't be specifying Swift 5.0 on newer versions of Xcode.