Automate asio sys build

[alisomay]

Hello all,

Having a rather manual pre build preparation process for the windows ASIO support could be cumbersome for users who'd like to install applications we publish to crates.io which depends on cpal by cargo install method because cargo install builds from source.

This PR is a suggestion to automate the two steps which is laid out in the readme..

• Automate the finding and retrieval of ASIO SDK.
• Set the build environment by invoking vcvarsall.bat

Trying to install LLVM would be out of scope for this script in my opinion because that is more general and essential to have a development environment. If the build fails due to that, normally the user can easily derive the reason from the error message.

I didn't update the README.md yet but if you find this PR welcome, I'd gladly do so.

Looking forward to your review!

*I've tested all the code paths on a x86_64 machine running Windows 10.
*The PR is an adaptation of a ps1 script I use for my project to automate the process in #801

[alisomay]

I can also develop it further if more robustness is required.

[est31]

in general it's a good idea to have a fallback mode where we download the asio SDK, but it should not cause additional dependencies for users who already have the SDK installed.

and it should also be mentioned in README :).

[est31]

we should not include reqwest for a tiny task like a build script. it's better to invoke some available windows-specific command that downloads a file from an url. same goes for the zip crate, if possible

[alisomay]

in general it's a good idea to have a fallback mode where we download the asio SDK, but it should not cause additional dependencies for users who already have the SDK installed.

and it should also be mentioned in README :).

Thanks for the quick look 🎉

I agree, the PR is meant to be a vehicle to show my intention not the complete implementation.
I'll re-work it in a way which it avoids dependencies and uses windows apis.

Also update the README.

Please don't hesitate to add any other ideas.

[alisomay]

• README.md updated.
• Build script uses powershell commands now.
• Build script detects if vcvarsall.bat is invoked in the session or not.

[chipnertkj]

When is this going to be released to crates.io? I've noticed that the cargo-publish job was skipped.