This utility automatically manages Swift script execution by intelligently switching between interpretation and compilation modes. It is indented as a drop-in replacement for the Swift shebang in Swift scripts (#!/usr/bin/env swift-scc intead of #!/usr/bin/env swift)
Copy the script somewhere in your path
Replace your #!/usr/bin/env swift with #!/usr/bin/env swift-scc
You can also simply run a script using: swift-scc example.swift
To enable detailed logging about compilation, set the SWIFT_SCC_LOGGING environment variable.
You can either export SWIFT_SCC_LOGGING=true or run SWIFT_SCC_LOGGING=true swift-scc example.swift
- Eliminates Swift's interpreter startup overhead for faster performance
- Caches compiled binaries to avoid unnecessary recompilation
- Optimizes for development speed during initial iterations
- Ensures maximum performance in automated/non-interactive contexts
- In non-interactive mode: immediately compiles if needed and executes the binary
- In interactive terminal: uses interpreter for first 3 executions, then compiles
- Maintains a cached binary that's automatically rebuilt when the source script changes