+ /// Returns the primary target associated with a side effect target.
+ Target *get_primary_target() const { return primary_target; }
+
+ /** Tries to locate a target that will help getting this target built. If
+ all dependencies are up-to-date, returns this target. If there are no
+ targets ready to be built (maybe because they are being built right now),
+ returns 0. */
+ virtual Target *get_buildable_target();
+
+ /** If this target is a proxy for another (such as InstalledFile), return
+ that target. Otherwise, return the target itself. Implementors should call
+ the function recursively to find the final target. */