After an update-checkout, trying to re-build the the compiler for Xcode with
SKIP_XCODE_VERSION_CHECK=1 ./swift/utils/build-script --xcode --release-debuginfo --debug-swift --skip-build-benchmarks --swift-darwin-supported-archs "$(uname -m)" --sccache --skip-ios --skip-tvos --skip-watchos and
clang: **error:** unknown argument: '-fswift-async-fp=always' come up, the problem seems that for Xcode builds it is using the pre-built version that ships with Xcode (using 12.5.1), ninja build seems fine since it uses the one built from source. We have a similar problem before, here https://bugs.swift.org/browse/SR-14714 but with a different flag.
So my question is if there is a simple way to get around this? Make Xcode builds use the from source built clang or it is better to download and try a beta version of Xcode to fix this? Or maybe another approach?
Thanks in advance!