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[This is a spin-off from bug #57811]
The xamarin_start_wwan symbol is used in a P/Invoke in both Xamarin.iOS.dll and System.dll.
Xamarin.iOS.dll uses dlsym to call P/Invokes, while System.dll does not.
This confuses mtouch, and mtouch does not preserve the symbol when the executable is stripped, which prevents Xamarin.iOS.dll from calling the native function (System.dll still can though).
There's a fairly trivial workaround: pass "--nosymbolstrip:<symbol>" as an additional mtouch argument.
@Sebastien, this is a regression in 15.3, but since I believe this to be somewhat obscure, and in any case there's a trivial workaround (comment #2), I don't think we need to get this in 15.3. Does that sound good?
Did this happen in 15.3 or earlier ? Please file the last known bold field with the data. Thanks!
This regressed here: https://github.com/xamarin/xamarin-macios/commit/d17cb6556a4cb4ae9fec59e5687518f4ac3dc460, which is include in 15.3 (but not 15.2).
Fixed (master): https://github.com/xamarin/xamarin-macios/commit/2fa55d410d6cf09fed7751069a2704881ba270b1