rustup should suggest Windows 11 SDK while installing on Windows 11

[arnabanimesh]

Problem you are trying to solve

On Windows 11, it suggests installing Windows 10 SDK instead of Windows 11 SDK. Latest SDK improvements and security improvements need to be supported.

Solution you'd like

Suggest latest supported Windows SDK instead of a specific version

Notes

No response

[rbtcollins]

Is that what rustc needs?

[kinnison]

I'd be willing to have the recommendation URL change based on the OS you're installing on. If installing on win 10 recommend the win 10 SDK, if on win 11, recommend the win11 one but also mention the win10 one if you are developing for older systems. There's no point in us making it harder for people coming to Rust to develop apps which will work in a wider area.

[rbtcollins]

https://www.reddit.com/r/rust/comments/r6vkge/when_will_rust_support_windows_11_sdk/ seems to be the genesis of this discussion. Its not clear to me that rustc actually uses the windows 10 or 11 SDK at all: the windows crates involved are https://github.com/microsoft/windows-rs or https://github.com/retep998/winapi-rs. The latter is hand-crafted, no dependency on the SDK. The former is also independent of the SDK as far as I can tell - its a projection of metadata from the https://github.com/microsoft/win32metadata project.

So I really do mean 'Is that what rustc needs?'. If this request is coming from folk confused about what is needed, great, lets fix that. If its coming from rustc having some need for a different SDK when targeting windows programs, then great lets fix that.

[kinnison]

I think I possibly misunderstood - this is likely referring to https://github.com/rust-lang/rustup/blob/master/doc/src/installation/windows.md?plain=1#L15 which mentions ensuring you install the Windows 10 SDK, which is likely to ensure there's a C runtime etc. Not sure how to improve this without introducing confusion.

[arnabanimesh]

Just mention Windows 10 SDK or newer. It should suffice.

[ChrisDenton]

The Windows SDK is required for every msvc application that uses the standard library. It includes import libraries for core system functions (e.g. from kernel32 et al). In the future this may be made optional (see raw_dylib) but that isn't the case at the moment.

For most stuff it doesn't particularly matter which version you use so long as it has the symbols the standard library needs. Although it may matter if you make use of any utilities. etc that come with the SDK (though these aren't used by Rust itself) or want to use newer symbols (and don't want to use the windows crate).

[rbtcollins]

Ok so concretely if I read this right:

• rust targeting MSVC needs the build tools + import libraries for the windows APIs in use, and currently nothing in std::sys requires a Windows 11 import library.
• third party crates may require Windows 11 import libraries
• rust in future might require Windows 11 import libraries [though presumably compat discussions make that harder]
• the SDK also includes tool that people may choose to use.

So I think rustup should say something a little closer to this than it does today: something like Rust requires MSVC build tools and Windows API import libraries in order to compile Rust programs targetting the Windows MSVC runtime. These can be obtained by installing any current release of the MS Windows desktop development SDK.

thoughts?

[ChrisDenton]

Hm, the problem is that wording isn't particularly actionable. Whereas "Windows 10 SDK" directly describes something that can be selected in the installer. I'd prefer to have a clear and concise answer to "what should I do next?".

For reference, here's a screenshot of the current Visual Studio installer (this is the build tools installer, but other installers aren't too different):

Screenshot

[ChrisDenton]

Just thinking outside the box a bit, but an alternative might be for rustup to offer to download the installer and pre-select the correct components. So all the user has to do is accept the license and click through to install.

[saintjer2224]

Here's what I got from Microsoft: https://learn.microsoft.com/en-us/answers/questions/511294/do-we-need-to-choose-specific-windows-10-sdk-or-al

[garretwilson]

It would be nice if this were addressed for newcomers (like me) who have the exact same questions installing Rust. Do I need the Windows 10 SDK, the Windows 11 SDK, or is an SDK even needed?

And here's another question: can I select the "Individual Components" tab and reduce the required components even further? I don't want to be installing additional Microsoft cruft if I don't need to if I just want to program Rust.