[utils] Fix MONO_SIGNAL_USE_UCONTEXT_T not being defined on tvOS simulator
In the maccore tvossimulator tests we were seeing the following assertion with the Mono 4.5 preview:
```
error: * Assertion: should not be reached at /Users/builder/data/lanes/1381/
0d6923b4/source/maccore/external/mono/mono/utils/mono-context.c:194
0 dont link 0x000000010175702d mono_handle_native_sigsegv + 253
1 libsystem_platform.dylib 0x000000010a0cfeaa _sigtramp + 26
2 ??? 0x0000000001bfc4db 0x0 +
29344987
3 libsystem_c.dylib 0x0000000109e56cbc abort + 129
4 dont link 0x00000001018d1503 _ZL12log_callbackPKcS0_S0_iPv + 67
5 dont link 0x00000001018c26d0 monoeg_assertion_message + 192
6 dont link 0x00000001018af6de mono_sigctx_to_monoctx + 30
7 dont link 0x000000010183f473 sgen_suspend_thread + 323
8 dont link 0x000000010183f58e sgen_thread_handshake + 126
9 dont link 0x000000010183fb20 sgen_client_stop_world + 1296
10 dont link 0x0000000101871283 sgen_stop_world + 67
11 dont link 0x0000000101870d43 sgen_perform_collection + 99
12 dont link 0x0000000101872576 sgen_gc_collect + 102
13 dont link 0x00000001018d1886 _ZL7pump_gcPv + 54
14 libsystem_pthread.dylib 0x000000010a0b7c13 _pthread_body + 131
15 libsystem_pthread.dylib 0x000000010a0b7b90 _pthread_body + 0
16 libsystem_pthread.dylib 0x000000010a0b5375 thread_start + 13
```
This was caused by
a4e257a07f511062a8feb3e06e1566fd980110ce, the issue is that the check was changed from UCONTEXT_REG_RAX to MONO_SIGNAL_USE_UCONTEXT_T, but that is only available when HAVE_SIGACTION is defined which it is not in this case.
Discussed with Zoltan, fixing this by enabling MONO_SIGNAL_USE_UCONTEXT_T on all apple platforms for now.
projects / mono.git / commit