错误信息 unterminated variable reference. stop. 指出在 Makefile 的变量或函数引用中存在问题,即引用没有正确终止。查找代码中可能存在的未正确终止的变量引用: 检查Makefile 中所有的变量引用,确保每个引用都使用了正确的闭合括号或花括号。 常见的错误包括忘记闭合的括号或花括号,例如 $(VARIABLE 或${VAR
when I build all, this error occurs. what's the root cause?
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