Force Xcode SDK instead of CLI SDK?

[Ryan Schmidt]

On Nov 20, 2020, at 09:54, Clemens Lang wrote:

> I'm very-well aware of this problem. However, when `use_xcode` is set, I
> think we must prefer an Xcode SDK with the required tools for GUI stuff,
> even if it isn't the exact version and a CLT SDK with the expected
> version is available.

What do you mean by "an Xcode SDK with the required tools for GUI stuff"? Aren't the SDKs from the command line tools identical to the SDKs from Xcode?