Project Builder preferences

Specify what should happen with your projects during a build:

Delete user files in output folder
Specify your preferences for receiving a notification when Eclipse attempts to delete any user files in the output folder.
Delete build artifacts in output folder when project settings change
Changing a project's settings would trigger a rebuild of the project. Specify whether Eclipse should prompt you before deleting any existing build artifacts.
Dependency paths
Check this if you want Eclipse to add any new directories you add to a project to the Dependency Paths on the Build Path tab of the project's properties.
Build triggers
Disregard changes to output folder - check this if any changes to the contents of the output folder should not trigger a build.
Multi-processor compilation/linking
Native COBOL only. Specify the maximum number of concurrent compilation or links. On multi-CPI machines, this enables you to achieve a faster parallel multi-processors of multiple files.