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Previously, a full cleanup of the work directory (and thus a full rebuild) was done on the first build after: - startup, or - a change in the board or board suboption. This did not cooperate nicely with commandline compilation using --verify. Using the build.path option a persistent build path could be used, but the actual files in that path would never be reused. Now, each build saves the preferences used for building in a file "buildprefs.txt" inside the build directory. Subsequent builds will read this file to see if any build options changed and re-use the existing files if the build options are identical. Because the main .cpp file is not handled by Compiler::build, but by Sketch::preprocess, it is still always regenerated, even if the Sketch itself didn't change. This could be fixed later, though it is probably not a problem. When writing buildprefs.txt, only the build preferences starting with "build.", "compiler." or "recipes." are used. These should be enough to ensure files are always rebuilt when needed (probably also sometimes when not needed, when change build.verbose for example). Using all build preferences would cause the files to be rebuild too often, and because of last.ide.xxx.daterun, they would still rebuild on _every_ invocation... This approach is perhaps not ideal, but improving it would require putting more structure in the preferences instead of piling them all together into the build preferences. Because of this new mechanism, the old buildSettingsChanged()/deleteFilesOnNextBuild could be removed.