R.swift cannot find .rswiftignore for a project that isn't made by xcodeproj but Package.swift.
It is because that SOURCE_ROOT environment variable doesn't exist when a project is build with Package.swift and currently the source code references ./SOURCE_ROOT literally.
R.swift cannot find .rswiftignore for a project that isn't made by xcodeproj but Package.swift.
It is because that
SOURCE_ROOT
environment variable doesn't exist when a project is build with Package.swift and currently the source code references./SOURCE_ROOT
literally.issue: #819