Yes, the Static Linux script builds it as the first step: swift-docker/swift-ci/sdks/static-linux/scripts/build.sh at b4c06a25839e7e3a10eb93a53bd137beb81c12b7 · swiftlang/swift-docker · GitHub
Ah, in the Android script, it gets built when swiftlang/swift/utils/build-script is called: swift/utils/swift_build_support/swift_build_support/cmake.py at 5b92e5c57d0058648761c5de01b7174f00337831 · swiftlang/swift · GitHub