Is .NET 5.0 and C# 9 a "threat" to D?

[Gregor Mückl]

On Thursday, 12 November 2020 at 18:08:48 UTC, IGotD- wrote:
> On Thursday, 12 November 2020 at 17:05:52 UTC, Gregor Mückl 
> wrote:
>>
>> I fail to parse that question. I'm afraid. Do you mean to ask 
>> whether .NET users are porting the runtime to other operating 
>> systems themselves?
>>
>
> Yes that is what I meant and if .NET has a MIT license that 
> helps.
>

Then again, the .NET CLR implementations that I know of are 
massive beasts. Porting them is no easy tasks and I am not aware 
of anyone who is doing that.

This is (part of?) the single static binary compilation project I 
was referring to earlier: https://github.com/dotnet/corert

I believe that an approach like that can be retargeted to 
different operating systems more easily.

>>
>> Most of .NET is licensed under MIT. It is my understanding 
>> that the entirety of the cross-platform code is released under 
>> that license. I do not know whether the Windows Desktop 
>> version of the runtime includes extra components that are 
>> still proprietary.
>>
>
> You have to be careful with this one. Let's say you some 
> proprietary system which which is using .NET and is MIT. Then 
> you have unittests that can run on your x86 Windows PC target 
> and those link in proprietary MS components, then you must buy 
> a license.

This is an overview over the licenses for the .NET 5.0 Windows 
Desktop Runtime:

https://github.com/dotnet/core/blob/master/license-information-windows.md

So this is quite a mix and the most worrying part are the two 
libraries under the Visual Studio License. My understanding is 
that these are not free (as in beer) unless you qualify for a 
Visual Studio Community license.

My understanding is that the Linux version is free of these 
constraints.