Try to fix osx

Author: jkotas

src/coreclr/src/nativeaot/Bootstrap/main.cpp

@@ -192,14 +192,18 @@ int main(int argc, char* argv[])
 #endif // !CORERT_DLL
 
 #ifdef CORERT_DLL
-struct InitializeRuntimePointerHelper
+static struct InitializeRuntimePointerHelper
 {
     InitializeRuntimePointerHelper()
     {
         RhSetRuntimeInitializationCallback(&InitializeRuntime);
     }
-};
+} initializeRuntimePointerHelper;
+
+extern "C" void* CoreRT_StaticInitialization();
 
-extern "C" InitializeRuntimePointerHelper CoreRT_StaticInitialization;
-InitializeRuntimePointerHelper CoreRT_StaticInitialization;
+void* CoreRT_StaticInitialization()
+{
+    return &initializeRuntimePointerHelper;
+}
 #endif // CORERT_DLL

src/coreclr/src/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.props

@@ -85,8 +85,9 @@ The .NET Foundation licenses this file to you under the MIT license.
       <LinkerArg Include="-licucore" Condition="'$(TargetOS)' == 'OSX'" />
       <LinkerArg Include="-dynamiclib" Condition="'$(TargetOS)' == 'OSX' and '$(NativeLib)' == 'Shared'" />
       <LinkerArg Include="-shared" Condition="'$(TargetOS)' != 'OSX' and '$(NativeLib)' == 'Shared'" />
-      <LinkerArg Include="-Wl,--require-defined,CoreRT_StaticInitialization" Condition="'$(NativeLib)' == 'Shared'" />
-      
+      <LinkerArg Include="-Wl,-u,_CoreRT_StaticInitialization" Condition="'$(TargetOS)' == 'OSX' and '$(NativeLib)' == 'Shared'" />
+      <LinkerArg Include="-Wl,--require-defined,CoreRT_StaticInitialization" Condition="'$(TargetOS)' != 'OSX' and '$(NativeLib)' == 'Shared'" />
+
       <LinkerArg Include="@(NativeFramework->'-framework %(Identity)')" Condition="'$(TargetOS)' == 'OSX'" />
     </ItemGroup>