If a variant supplied source files, these would be included in core.a before. However, object files from core.a would only actually be included in the build if they supplied a symbol for a strong reference that was still missing. In practice, this meant that a variant source file that only defines interrupt handlers, or only defines strong versions of functions that already had weak versions available, was not included. By moving the variant .o files out of core.a and including them in the build directly, this problem is solved. Furthermore, the compilation of variant files is moved to after the generation of core.a, to make it clearer in the code and verbose output what is now happening.
Arduino
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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.
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For more information, see the website at: http://www.arduino.cc/ or the forums at: http://arduino.cc/forum/
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To report a bug in the software or to request a simple enhancement go to: http://github.com/arduino/Arduino/issues
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More complex requests and technical discussion should go on the Arduino Developers mailing list: https://groups.google.com/a/arduino.cc/forum/#!forum/developers
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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.
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