'#+' and '#-' introduce conditional compilation: the form that follows is kept only when the feature expression is true, and otherwise is read and thrown away. An expression is a feature name, or and / or / not of them. They are read time, not compile time. Default features are the host's software-version, software-type and machine-type as CHICKEN reports them, plus what --features flag adds.
8.6 KiB
8.6 KiB