swift-windows.ps1

cmake -B "S:\build\toolchain" -G Ninja -S S:\toolchain\llvm `
  -C S:\windows-swift\cmake\caches\windows-x86_64.cmake `
  -C S:\windows-swift\cmake\caches\org.compnerd.dt.cmake `
  -D CMAKE_BUILD_TYPE=Release `
  -D LLVM_ENABLE_ASSERTIONS=YES `
  -D LLVM_ENABLE_PROJECTS="clang;clang-tools-extra;cmark;swift;lldb;lld" `
  -D LLVM_EXTERNAL_PROJECTS="cmark;swift" `
  -D LLVM_DEFAULT_TARGET_TRIPLE="x86_64-unknown-windows-msvc" `
  -D LLVM_USE_HOST_TOOLS=NO `
  -D SWIFT_PATH_TO_LIBDISPATCH_SOURCE=S:\toolchain\swift-corelibs-libdispatch `
  -D LLVM_ENABLE_LIBEDIT=NO `
  -D LLDB_ENABLE_PYTHON=NO `
  -D SWIFT_WINDOWS_x86_64_ICU_UC_INCLUDE="S:/Library/icu-64/usr/include" `
  -D SWIFT_WINDOWS_x86_64_ICU_UC="S:/Library/icu-64/usr/lib/icuuc64.lib" `
  -D SWIFT_WINDOWS_x86_64_ICU_I18N_INCLUDE="S:/Library/icu-64/usr/include" `
  -D SWIFT_WINDOWS_x86_64_ICU_I18N="S:/Library/icu-64/usr/lib/icuin64.lib" `
  -D CMAKE_INSTALL_PREFIX="C:\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain\usr" `
  -D PYTHON_EXECUTABLE=C:\Users\katei\AppData\Local\Microsoft\WindowsApps\python3.exe `
  -D SWIFT_BUILD_DYNAMIC_STDLIB=YES `
  -D SWIFT_BUILD_DYNAMIC_SDK_OVERLAY=YES `
  -D SWIFT_BUILD_DISABLE_LLDB_PYTHON_SCRIPTS=YES

subst S: C:\Users\katei\swift-source

https://github.com/apple/swift/blob/master/docs/WindowsBuild.md