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问 WinAVR (pronounced "whenever") is a suite of executable, open source software development tools for the Atmel AVR series of RISC microprocessors hosted on the Windows platform. It includes the GNU GCC compiler for C and C++.

WinAVR is the same thing as AVR GCC that is referenced on other sites. It contains the same GCC compiler for the AVR target.

WinAVR is comprised of many Open Source projects. If you feel adventurous, volunteers are always welcome to help with fixing bugs, adding features, porting, writing documentation and many other tasks on a variety of projects.

http://winAVR.sourceforge.net/ 答 1: 不知有什么改进，down了先 答 2: 0424早就有了，现在都6月了。