16:35:12
Linking /home/buildnode/jenkins/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/buildbot_incremental/swiftpm-linux-x86_64/x86_64-unknown-linux/release/SwiftPMPackageTests.xctest
16:35:14
/home/buildnode/jenkins/workspace/oss-swift-incremental-RA-linux-ubuntu-14_04/buildbot_incremental/xctest-linux-x86_64/libXCTest.so: error: undefined reference to '$sSH13_rawHashValue4seedSis6UInt64V_ADt_tFTq'
This will need a clean build; https://github.com/apple/swift/pull/19495 changed a hidden Hashable requirement.