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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.
Arduino is an open-source physical computing platform based on a simple i/o board and a development environment that implements the Processing/Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The boards can be assembled by hand or purchased preassembled; the open-source IDE can be downloaded for free. For more information, see the website at: http://www.arduino.cc/ or the forums at: http://arduino.cc/forum/ To report a *bug* in the software or to request *a simple enhancement* go to: http://github.com/arduino/Arduino/issues More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers If you're interested in modifying or extending the Arduino software, we strongly suggest discussing your ideas on the Developers mailing list *before* starting to work on them. That way you can coordinate with the Arduino Team and others, giving your work a higher chance of being integrated into the official release https://groups.google.com/a/arduino.cc/forum/#!forum/developers INSTALLATION Detailed instructions are in reference/Guide_Windows.html and reference/Guide_MacOSX.html. For Linux, see the Arduino playground: http://www.arduino.cc/playground/Learning/Linux CREDITS Arduino is an open source project, supported by many. The Arduino team is composed of Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, Daniela Antonietti, and David A. Mellis. Arduino uses the GNU avr-gcc toolchain, avrdude, avr-libc, and code from Processing and Wiring. Icon and about image designed by ToDo: http://www.todo.to.it/