The provided argument is named egl.build.gen.debug, and you use it to specify whether the generated output can include debugging information. The default for the argument value is true, but you might set the value to false if you want to save time. You can set that argument either in the eclipse.ini file or in the Ant statement that invokes the product.
Do not set the egl.build.gen.debug property to false for a session when you also intend to use the workspace for development. The reason is as follows: Debugging information is sometimes used in the interactive development environment, even in the absence of a debug build descriptor. For example, the Rich UI design and preview modes automatically use a generated output that includes debugging information.