问题描述
我想在 API 中提供一个字符串常量，如下所示:
I want to provide a string constant in an API like so:
extern const char* const SOME_CONSTANT;
但如果我在我的静态库源文件中将其定义为
But if I define it in my static library source file as
const char* const SOME_CONSTANT = "test";
我在链接到该库并使用 SOME_CONSTANT 时遇到链接器错误:
I'm getting linker errors when linking against that library and using SOME_CONSTANT:
错误 1 错误 LNK2001:无法解析的外部符号char const * const SOME_CONSTANT"(?SOME_CONSTANT@@3QBDB)
从 extern const char* const 声明和定义中删除指针 const-ness(第二个 const 关键字)使其工作.如何使用指针常量导出它?
Removing the pointer const-ness (second const keyword) from both the extern const char* const declaration and the definition makes it work. How can I export it with pointer const-ness?
推荐答案
问题可能是 extern 声明在定义常量的源文件中不可见.尝试重复定义上面的声明，如下所示:
The problem could be that the extern declaration is not visible in the source file defining the constant. Try repeating the declaration above the definition, like this:
extern const char* const SOME_CONSTANT; //make sure name has external linkage
const char* const SOME_CONSTANT = "test"; //define the constant
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