未定义参考错误的含义 [英] Meaning of Undefined reference error

问题描述

未定义的引用错误是指缺少声明或定义或两者？

Undefined reference error refers to missing declaration or the definition or both?

编译器：Linux上的GCC

Compiler: GCC on Linux

推荐答案

通用（如果不是总是？）这是一个链接器错误，这意味着缺少定义。缺少声明的编译错误类似于：XXX未在此作用域中声明。

Usualy (if not always?) it's a linker error and it means missing definition. Compilation errors for missing declarations are similar to: "XXX was not declared in this scope."

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