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Jun,
这是编译器的问题,如果用TI的编译器,请按下面步骤升级编译器,并使能GCC扩展功能。
Installing the compiler
Enabling gcc extensions
Modify the individual build properties of all libs and examples (usblib, system, platform etc) to enable “--gcc” extension. This can be found under - ARM Compiler -> Advanced Options. Failure to do so would result in compilation errors.