Updated single script of post: https://www.polidea.com/blog/how-to-build-swift-compiler-based-tool-the-step-by-step-guide/

bootstrap_swift_environment.sh

brew install cmake ninja
brew install sccache
mkdir swift-source
cd swift-source
git clone --branch swift-5.1.5-RELEASE git@github.com:apple/swift.git
./swift/utils/update-checkout --clone-with-ssh
# ./swift/utils/update-checkout --tag swift-5.1.5-RELEASE
# sccache --start-server
./swift/utils/build-script --clean --xcode --release-debuginfo
./swift/utils/build-script --ios --release-debuginfo
mkdir -p build/PristineCopy/macosx/swift
cp -r build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/RelWithDebInfo/lib/swift/ build/PristineCopy/macosx/swift/
rm -r -f build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/RelWithDebInfo/lib/swift
cp -r build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/lib/swift build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/RelWithDebInfo/lib/swift
# rm -r -f build/Ninja-RelWithDebInfoAssert
open build/Xcode-RelWithDebInfoAssert/swift-macosx-x86_64/Swift.xcodeproj
cd swift
git checkout -b scrubjay-5.1.5
hub submodule add sstadelman/obfuscation-lib lib/Obfuscation
hub submodule add -f sstadelman/obfuscation-include include/swift/Obfuscation
hub submodule add sstadelman/obfuscator-name-mapper tools/obfuscator-name-mapper
hub submodule add sstadelman/obfuscator-renamer tools/obfuscator-renamer
hub submodule add sstadelman/obfuscator-symbol-extractor tools/obfuscator-symbol-extractor

# update tools/CMakeLists.txt and lib/CMakeLists.txt