Failing Tests while Compiling Swift on Xcode 12 with MacOS Big Sur Beta

:(

unfortunately the snippets of output you pasted don't reveal much of the cause of failure. Any chance you can dig a bit further and find the real reason for the failure?

Maybe passing --verbose-build to the build-script might help.

Maybe you have already tried this but usually what helps for me is to make sure to run an update checkout and after that build with --clean to remove any outdated CMake and build files.
Maybe that can help :)

So I ran --verbose-build and I got multiple outputs with exit code 1 and 2. I have made a gist for the output I think is relevant in my case here:

When you have time to look, let me know if you want to look at something particular and/or want me to do something else to debug this error.

Ya I am running --clean before every build.

I get what looks like the same failures when building on Linux with Ninja building with Xcode: https://gist.github.com/dabrahams/6f3840c0609ad7c30736a5aca378d269

See also https://bugs.swift.org/browse/SR-13635