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未使用的是ipnc5.1解决方案 里面自带交叉编译链 arm-arago-linux-gnueabi-gcc是4.3.3的 不支持一些高级特性，希望能升级一些 交叉编译工具 ，请问能在哪里去获得最新的交叉工具且能对旧版进行兼容
