Mac impl progress

Source/Engine/Scripting/ManagedCLR/MCore.cpp

@@ -492,6 +492,9 @@ bool MCore::LoadEngine()
     ThisLibHandle = dlopen(nullptr, RTLD_LAZY);
 	mono_dl_fallback_register(OnMonoLinuxDlOpen, OnMonoLinuxDlSym, nullptr, nullptr);
 #endif
+#elif PLATFORM_MAC
+    // Adjust GC threads suspending mode on Mac
+    Platform::SetEnvironmentVariable(TEXT("MONO_THREADS_SUSPEND"), TEXT("preemptive"));
 #endif
     const char* configPath = nullptr;
 #if PLATFORM_SWITCH

Source/Engine/Scripting/ScriptingObject.cpp

@@ -14,9 +14,7 @@
 #include "ManagedCLR/MClass.h"
 #include "ManagedCLR/MUtils.h"
 #include "ManagedCLR/MField.h"
-#if PLATFORM_LINUX
 #include "ManagedCLR/MCore.h"
-#endif
 #include "FlaxEngine.Gen.h"
 #if USE_MONO
 #include <ThirdParty/mono-2.0/mono/metadata/object.h>
@@ -324,7 +322,7 @@ bool ScriptingObject::CanCast(MClass* from, MClass* to)
         return true;
     CHECK_RETURN(from && to, false);
 
-#if PLATFORM_LINUX
+#if PLATFORM_LINUX || PLATFORM_MAC
     // Cannot enter GC unsafe region if the thread is not attached
     MCore::AttachThread();
 #endif