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.
Copybook paths
Configure the behavior when adding new directories to the copybook paths required when resources outside of your project structure are used.
Automatically add new directories to copybook paths - determines if directories are selected by default when they are added to the dependency path.
Insert to the beginning of copybook paths list - new directories are added to the top of the copybook paths list (that is, they are searched first).
Append to the end of copybook paths list - new directories are added to the end of the copybook paths list (that is, that location is searched last).
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
Maximum compilations/links to execute concurrently. Change the value to increase\decrease the maximum number of concurrent compilations or links that will be performed when building native COBOL projects. This option is also supported when performing multi-file compilations. You may need to experiment with the value specified in order to give the most optimal build times.
Note: The compilation output displayed in the Console during concurrent compilations may not necessarily be in the same order as the files are listed in your project.