FirebaseAnalytics build error with -ld_classic, -ObjC and iOS 17.6 on Xcode 26 Beta

[tiagomartinho]

Description

FirebaseAnalytics fails to build when using -ld_classic, -ObjC and setting Minimum Deployment to iOS 17.6 or older on Xcode 26.0 beta 7 (17A5305k)

I've created a sample project where I just added the Firebase Analytics Package using SPM and the two linker flags https://github.com/tiagomartinho/firebase_analytics_ld_classic_issue

Reproducing the issue

1. Add FirebaseAnalytics
2. Add -ld_classic and -ObjC in OTHER_LDFLAGS in the build settings
3. Set the Minimum Deployment to iOS 17.6 or older
4. Build the project

Firebase SDK Version

12.2.0

Xcode Version

26.0 beta 7 (17A5305k)

Installation Method

Swift Package Manager

Firebase Product(s)

Analytics

Targeted Platforms

iOS

Relevant Log Output

0  0x100a1d788  __assert_rtn + 160
1  0x100a20570  ld::tool::SymbolTableAtom<x86_64>::classicOrdinalForProxy(ld::Atom const*) (.cold.3) + 0
2  0x100957db0  ld::tool::SymbolTableAtom<x86_64>::classicOrdinalForProxy(ld::Atom const*) + 172
3  0x100958c24  ld::tool::SymbolTableAtom<arm64>::addImport(ld::Atom const*, ld::tool::StringPoolAtom*) + 140
4  0x10095a508  ld::tool::SymbolTableAtom<arm64>::encode() + 396
5  0x10094c3b0  ___ZN2ld4tool10OutputFile20buildLINKEDITContentERNS_8InternalE_block_invoke.413 + 36
6  0x18ff6fb2c  _dispatch_call_block_and_release + 32
7  0x18ff8985c  _dispatch_client_callout + 16
8  0x18ffa64cc  _dispatch_channel_invoke.cold.5 + 92
9  0x18ff81fa4  _dispatch_root_queue_drain + 736
10  0x18ff825d4  _dispatch_worker_thread2 + 156
11  0x190123e28  _pthread_wqthread + 232
A linker snapshot was created at:
	/tmp/firebase_analytics_ld_classic_issue.debug.dylib-2025-09-03-170549.ld-snapshot
ld: Assertion failed: (it != _dylibToOrdinal.end()), function dylibToOrdinal, file OutputFile.cpp, line 5196.
clang: error: linker command failed with exit code 1 (use -v to see invocation)

If using Swift Package Manager, the project's Package.resolved

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If using CocoaPods, the project's Podfile.lock

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[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[rizafran]

Thanks for the report, @tiagomartinho. The issue looks related to this Apple forum. Have you tried the workaround shared by the engineer there?

[tiagomartinho]

Thank you for sharing the related issue. Please let me know if I’ve missed anything, but the proposed solutions all seem to rely on using the new linker (by removing -ld64 or -ld_classic). That does resolve the issue with FirebaseAnalytics. However, what I’m looking for is a solution that works with the old linker and on iOS versions prior to 18.

[rizafran]

Hi @tiagomartinho, I tried changing the -ld_classic to the new linker flag but it's working when I tried running the app on iOS 17. May I know if you're encountering any error when removing the -ld_classic flag?