Help with build after updating checkout

Development Compiler
1

i recently updated my local compiler checkout for the first time in a while (via the update-checkout script). when i went to rebuild things with build-script i got some errors i don't understand. i ran the following command initially:

utils/build-script \
        --sccache \
        --skip-build-benchmarks \
        --skip-ios --skip-tvos --skip-watchos --skip-xros \
        --swift-darwin-supported-archs arm64 \
        --release-debuginfo --swift-disable-dead-stripping \
        --reconfigure \
        --clean \
        --bootstrapping=hosttools

this seemed to successfully build some dependencies (LLVM was happily building for like over 20 minutes), but eventually started producing errors like this:

swift-project/swift/include/swift/Basic/StableHasher.h:136:29: error: no member named 'endianness' in namespace 'llvm'; did you mean 'llvm::support::endianness'?

i'm using Xcode 16.1 as the default toolchain, and am running on a machine with macos 14.5 (could this be part of the problem?). any insights or suggestions for what this error indicates or things to try differently to get past the problem would be appreciated!

update: ran ./utils/update-checkout then that build command from above again and this time it worked... :person_shrugging:.