Each time we do a build, we have to record the changelist number of source files for tracking. We have different projects (under different directories) and they are synced at different changelist number. May you please show me how can we get the changelist number of a specific directory?
Also, there's p4 changes -m1 //path/to/your/project/...#have which, if run in the client workspace that synced the files for building, will give you the highest changelist number of the files in the workspace.