Unsafe code compilation error in .NET Core even after setting allowunsafe flag to true in project.json

Question

I am using some unsafe code in my .NET Core app. For that, I had made this change in the project.json file:

Answer 1

Change compilationOptions to buildOptions:

"buildOptions": {
    "allowUnsafe": true
}

Answer 2

In the newer *.csproj files, this is now:

<AllowUnsafeBlocks>true</AllowUnsafeBlocks>

in any PropertyGroup.