在A.c文件中定义了 uint8_t echo_buf_1[8]数组，然后在A.h头文件 extern了一下，在B.c包含 A.h文件，使用了ehcobuf，但是编译报错
Error[e46]: Undefined external "echo_buf_1" referred in adc10_a
请问这是怎么回事？
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