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CCS3.3编译未外部声明的函数



本人的问题:是函数A()在test.c文件中,函数B()在main.c文件中,函数B调用函数A时,没有在main.c文件中进行A函数的外部声明,即:没有extern int A();

CCS3.3没有报错,只是报警告?如何使CCS编译时进行报错对此情况?要求:不能影响其他警告,不能把其他waring改成error!