[mono] Fix compilation errors for iOS-arm64 sample

[EgorBo]

It doesn't build currently: we don't need entrypoint.c (references symbols iOS doesn't have e.g. from pal_console)
Also $(PackageRID) is evaluated as osx-x64 instead of arm64-x64, here is where my cross-compiler is defined:

icrosoft.netcore.app.runtime.ios-arm64/Release/runtimes/ios-arm64/native/cross/osx-arm64/mono-aot-cross

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[EgorBo]

The sample still doesn't work, it crashes with:

HelloiOS[681:153330] ((null) error) mono_gc_pthread_create Cannot transition thread 0x16b77b000 from 
STATE_BLOCKING with DO_BLOCKING

on start but at least it builds now.

[lambdageek]

Crash is tracked in #47121 - it's probably due to the hybrid suspend switch recently in #46873

[lambdageek]

@EgorBo I get a crash event if I revert the hybrid suspend change:

bt
* thread #2, name = 'tid_1103', queue = 'com.apple.root.default-qos', stop reason = signal SIGSEGV
  * frame #0: 0x00000001084f752c HelloiOS`mono_arch_get_call_target(code="") at tramp-amd64.c:802:6
    frame #1: 0x00000001083eb2fe HelloiOS`method_address_resolve(code_addr="") at aot-runtime.c:2130:18
    frame #2: 0x00000001083e0cc4 HelloiOS`load_aot_module(alc=0x0000600003561f00, assembly=0x0000600003b68240, user_data=0x0000000000000000, error=0x0000700003e1c928) at aot-runtime.c:2451:13
    frame #3: 0x000000010808cff6 HelloiOS`mono_assembly_invoke_load_hook_internal(alc=0x0000600003561f00, ass=0x0000600003b68240) at assembly.c:2078:4
    frame #4: 0x000000010808eb6a HelloiOS`mono_assembly_request_load_from(image=0x00007ffa0a008200, fname="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", req=0x0000700003e1cb30, status=0x0000700003e1cb6c) at assembly.c:3397:2
    frame #5: 0x000000010808e44b HelloiOS`mono_assembly_request_open(filename="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", open_req=0x0000700003e1cbb8, status=0x0000700003e1cb6c) at assembly.c:2854:8
    frame #6: 0x000000010808fa4e HelloiOS`mono_assembly_open(filename="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", status=0x0000000000000000) at assembly.c:3208:8
    frame #7: 0x000000010857fa1b HelloiOS`load_assembly(name="System.Private.CoreLib", culture=0x0000000000000000) at runtime.m:105:34
    frame #8: 0x000000010857f19b HelloiOS`assembly_preload_hook(aname=0x0000600002d7e3a0, assemblies_path=0x0000000000000000, user_data=0x0000000000000000) at runtime.m:117:12
    frame #9: 0x0000000108090e65 HelloiOS`invoke_assembly_preload_hook(alc=0x0000600003561f00, aname=0x0000600002d7e3a0, apath=0x0000000000000000) at assembly.c:2306:15
    frame #10: 0x00000001080913ea HelloiOS`mono_assembly_load_corlib(runtime=0x00000001089a14b8, status=0x0000700003e1d74c) at assembly.c:4704:11
    frame #11: 0x0000000108088636 HelloiOS`mono_init_internal(filename="dotnet.ios", exe_filename=0x0000000000000000, runtime_version="mobile") at domain.c:611:9
    frame #12: 0x0000000108088e54 HelloiOS`mono_init_version(domain_name="dotnet.ios", version="mobile") at domain.c:893:9
    frame #13: 0x00000001082f20c5 HelloiOS`mini_init(filename="dotnet.ios", runtime_version="mobile") at mini-runtime.c:4561:12
    frame #14: 0x00000001083b357d HelloiOS`mono_jit_init_version(domain_name="dotnet.ios", runtime_version="mobile") at driver.c:2937:20
    frame #15: 0x000000010857edcf HelloiOS`mono_ios_runtime_init at runtime.m:263:5
    frame #16: 0x000000010857e165 HelloiOS`__29-[ViewController viewDidLoad]_block_invoke(.block_descriptor=0x00000001089ceb10) at main.m:49:9
    frame #17: 0x00000001094fa7ec libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #18: 0x00000001094fb9c8 libdispatch.dylib`_dispatch_client_callout + 8
    frame #19: 0x00000001094fde46 libdispatch.dylib`_dispatch_queue_override_invoke + 1032
    frame #20: 0x000000010950d508 libdispatch.dylib`_dispatch_root_queue_drain + 351
    frame #21: 0x000000010950de6d libdispatch.dylib`_dispatch_worker_thread2 + 135
    frame #22: 0x00007fff60c8e453 libsystem_pthread.dylib`_pthread_wqthread + 244
    frame #23: 0x00007fff60c8d467 libsystem_pthread.dylib`start_wqthread + 15
(lldb) p mono_threads_suspend_policy()
(MonoThreadsSuspendPolicy) $0 = MONO_THREADS_SUSPEND_FULL_PREEMPTIVE

This is an x64 simulator. compiled using make all MONO_CONFIG=Debug MONO_ARCH=x64 USE_LLVM=false AOT=true

[EgorBo]

@EgorBo I get a crash event if I revert the hybrid suspend change:

bt
* thread #2, name = 'tid_1103', queue = 'com.apple.root.default-qos', stop reason = signal SIGSEGV
  * frame #0: 0x00000001084f752c HelloiOS`mono_arch_get_call_target(code="") at tramp-amd64.c:802:6
    frame #1: 0x00000001083eb2fe HelloiOS`method_address_resolve(code_addr="") at aot-runtime.c:2130:18
    frame #2: 0x00000001083e0cc4 HelloiOS`load_aot_module(alc=0x0000600003561f00, assembly=0x0000600003b68240, user_data=0x0000000000000000, error=0x0000700003e1c928) at aot-runtime.c:2451:13
    frame #3: 0x000000010808cff6 HelloiOS`mono_assembly_invoke_load_hook_internal(alc=0x0000600003561f00, ass=0x0000600003b68240) at assembly.c:2078:4
    frame #4: 0x000000010808eb6a HelloiOS`mono_assembly_request_load_from(image=0x00007ffa0a008200, fname="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", req=0x0000700003e1cb30, status=0x0000700003e1cb6c) at assembly.c:3397:2
    frame #5: 0x000000010808e44b HelloiOS`mono_assembly_request_open(filename="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", open_req=0x0000700003e1cbb8, status=0x0000700003e1cb6c) at assembly.c:2854:8
    frame #6: 0x000000010808fa4e HelloiOS`mono_assembly_open(filename="/Users/alklig/Library/Developer/CoreSimulator/Devices/350A24D5-075C-4A14-9C70-E6BBAAC7C039/data/Containers/Bundle/Application/31DF40E5-8ABA-46D9-8FD5-893398D2F40B/HelloiOS.app/System.Private.CoreLib.dll", status=0x0000000000000000) at assembly.c:3208:8
    frame #7: 0x000000010857fa1b HelloiOS`load_assembly(name="System.Private.CoreLib", culture=0x0000000000000000) at runtime.m:105:34
    frame #8: 0x000000010857f19b HelloiOS`assembly_preload_hook(aname=0x0000600002d7e3a0, assemblies_path=0x0000000000000000, user_data=0x0000000000000000) at runtime.m:117:12
    frame #9: 0x0000000108090e65 HelloiOS`invoke_assembly_preload_hook(alc=0x0000600003561f00, aname=0x0000600002d7e3a0, apath=0x0000000000000000) at assembly.c:2306:15
    frame #10: 0x00000001080913ea HelloiOS`mono_assembly_load_corlib(runtime=0x00000001089a14b8, status=0x0000700003e1d74c) at assembly.c:4704:11
    frame #11: 0x0000000108088636 HelloiOS`mono_init_internal(filename="dotnet.ios", exe_filename=0x0000000000000000, runtime_version="mobile") at domain.c:611:9
    frame #12: 0x0000000108088e54 HelloiOS`mono_init_version(domain_name="dotnet.ios", version="mobile") at domain.c:893:9
    frame #13: 0x00000001082f20c5 HelloiOS`mini_init(filename="dotnet.ios", runtime_version="mobile") at mini-runtime.c:4561:12
    frame #14: 0x00000001083b357d HelloiOS`mono_jit_init_version(domain_name="dotnet.ios", runtime_version="mobile") at driver.c:2937:20
    frame #15: 0x000000010857edcf HelloiOS`mono_ios_runtime_init at runtime.m:263:5
    frame #16: 0x000000010857e165 HelloiOS`__29-[ViewController viewDidLoad]_block_invoke(.block_descriptor=0x00000001089ceb10) at main.m:49:9
    frame #17: 0x00000001094fa7ec libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #18: 0x00000001094fb9c8 libdispatch.dylib`_dispatch_client_callout + 8
    frame #19: 0x00000001094fde46 libdispatch.dylib`_dispatch_queue_override_invoke + 1032
    frame #20: 0x000000010950d508 libdispatch.dylib`_dispatch_root_queue_drain + 351
    frame #21: 0x000000010950de6d libdispatch.dylib`_dispatch_worker_thread2 + 135
    frame #22: 0x00007fff60c8e453 libsystem_pthread.dylib`_pthread_wqthread + 244
    frame #23: 0x00007fff60c8d467 libsystem_pthread.dylib`start_wqthread + 15
(lldb) p mono_threads_suspend_policy()
(MonoThreadsSuspendPolicy) $0 = MONO_THREADS_SUSPEND_FULL_PREEMPTIVE

This is an x64 simulator. compiled using make all MONO_CONFIG=Debug MONO_ARCH=x64 USE_LLVM=false AOT=true

AFAIK we don't build the sample in AOT on CI nor we run tests for iOS-AOT so it could be in the broken state for quite a while.

[steveisok]

We build the sample on CI, but don't set the AOT params. As for the functional tests, we're blocked on a few things. #47057 is the first one and the second is that the simulator hangs.