SwiftCompilationDatabase produces a compile_commands.json from the Swift compiler.
For tools, like iCompleteMe, that need to invoke the swift compiler outside of a build, JSONCompilationDatabase makes it easy to get all arguments for a file.
First, build from source
make
SwiftCompilationDatabase relies on the parseable output feature of Swift. Simply run the swift compiler with parseable output enabled ( -parseable-output ), and send the result to SwiftCompilationDatabase.
In practice, this means doing a clean build so all of the frontend invocations are recorded into the database.
swiftc main.swift -parseable-output 2>&1 | swift-compilation-database
SwiftCompilationDatabase works great with SwiftPM and swift build.
Do a clean build and pipe results
swift build -v -Xswiftc -parseable-output --build-path .build-comp-db 2>&1 | swift-compilation-database
To make a compilation database from Xcode, I recommend checking out XcodeCompilationDatabase