Compilation Error in Sentry React Native 6.10.0: Custom Allocator std::allocator_traits Issue

[archan0621]

What React Native libraries do you use?

React Native without Frameworks

Are you using sentry.io or on-premise?

sentry.io (SaS)

@sentry/react-native SDK Version

6.10.0

How does your development environment look like?

After upgrading from iOS sdk version 18.4, our iOS project fails to compile. The error appears to be related to a custom allocator (ThreadMetadataInnerHashMapAllocator) used within Sentry’s profiling code. Specifically, the compiler reports that the custom allocator does not meet the requirements of std::allocator_traits. For example, error messages include references to “rebinding an allocator to the same type should result in using the same object” and “No type named ‘value_type’”, which suggest that the allocator’s definitions (possibly regarding const qualifiers and required member types) are not in line with standard expectations.

Sentry.init()

Sentry.init({
  dsn: '',
  tracesSampleRate: 1.0,
  integrations: [new HttpClient()],
  beforeSend(event) {
    event.tags = {...event.tags, version: version};
    return event;
  },
  sendDefaultPii: true,
});

Steps to Reproduce

1. Upgrade iOS SDK to 18.4
2. Clean the iOS project by deleting Podfile.lock, the Pods/ directory, and Xcode’s DerivedData.
3. Run pod install --repo-update in the iOS directory.
4. Attempt to build the project in Xcode.

Expected Result

Build Success

Actual Result

Build failed with error

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk/usr/include/c++/v1/__memory/allocator_traits.h:378:17 Static assertion failed due to requirement 'is_same<std::allocator<const sentry::profiling::ThreadMetadataCache::ThreadHandleMetadataPair>, std::allocator<int>>::value': [allocator.requirements] states that rebinding an allocator to the same type should result in the original allocator


/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk/usr/include/c++/v1/__memory/allocator.h:95:17 Static assertion failed due to requirement '!is_const<const sentry::profiling::ThreadMetadataCache::ThreadHandleMetadataPair>::value': std::allocator does not support const types


/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk/usr/include/c++/v1/__type_traits/enable_if.h:28:58 No type named 'type' in 'std::enable_if<false, int>'; 'enable_if' cannot be used to disable this declaration


/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk/usr/include/c++/v1/vector:427:50 No type named 'value_type' in 'std::allocator<const sentry::profiling::ThreadMetadataCache::ThreadHandleMetadataPair>'

[kahest]

@archan0621 thanks for reporting! Did you also switch Xcode versions? Can you tell us the previous iOS/Xcode versions you built with?

@armcknight this looks related to getsentry/sentry-cocoa#4886 (see second error in the log) but that was fixed in sentry-cocoa 8.46.0 and is part of @sentry/react-native 6.10.0. could you please take a look?

cc @krystofwoldrich

[Jaltaire]

Experiencing the same issue as @archan0621.

No build issues with Xcode 16.2 (with iOS 18.2 SDK), only became an issue with 16.3 (yesterday), coinciding with the release of iOS 18.4 and its SDK.

[kahest]

Thanks @Jaltaire - this is most likely caused by Xcode 16.3 then and should already be fixed, but seems like something slipped through. We'll investigate and report back here