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I'd really like to use the compiler warnings for things like unused private variables, unused method parameters, etc. However, my project consists of a lot of generated code that's generated outside of my control (specifically Castor). This generated code contains a lot of these warnings, so the legitimate ones get lost in the chaff. I keep my written source and my generated source in different source directories, so I was thinking it would be nice to be able to keep different sets of warning/error preferences for different source folder sets. I'm not sure how confusing the UI on that would be, though.
Currently, you'd have to use different projects to achieve this. Each project can have its own custom set of settings. You can use prerequisite a project on another one's buildpath, so it should be what you want. Also note that each project can have its own buildpath, which could be useful in case some of your code isn't supposed to see internals of the rest of the code your are compiling against. Source folders can be associated with an exclusion filter and a custom output folder. We don't plan to provide source folder level compiler settings.
Closing
