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在test.c文件下定义函数A();
在main.c文件下函数B()对未进行函数A();的外部声明调用，编译时，编译器未报error，只是报waring。
问题：如何让这种情况下，编译器编译时报错误？
参考您的另一个帖子
www.deyisupport.com/.../12084.aspx
