Unable to compile for watchOS simulator on M1 systems

[sync-by-unito]

Expected results
I can integrate Realm using Package.swift and create Xcode project from Package.swift and then compile for watchOS simulator on M1 hardware

Actual Results
/Users/markw/Library/Developer/Xcode/DerivedData/utrealm_apple-bradedzrezbnygezsnaxhbsvzeye/SourcePackages/checkouts/realm-core/src/realm/impl/simulated_failure.cpp:181:1: error: thread-local storage is not supported for the current target
thread_local bool (*s_mmap_predicate)(size_t);
^
1 error generated.

Steps & Code to Reproduce
On Apple M1 based hardware
Setup library project using Package.swift
Integrate Realm in Package.swift
Open Package.swift with Xcode to create project
Build

Core version
Core version: 11.11.0

Note I originally filed issue 5173. I can now build on Intel hardware, but still can't build on M1 hardware.

[sync-by-unito]

➤ Diana Perez Afanador commented:

Hi @mwoollard I just pushed a branch with a possible fix for this. Can you test this on your side dp/watchos_simulator_old_architecture_target_not_thread_local.

[mwoollard]

@dianaafanador3 I can confirm the branch fixes issue we had building for watchOS simulator on M1 hardware. Thanks !

[dianaafanador3]

Fix merged realm/realm-core#5341