如何解决Visual Studio（LNK2005）中的此链接错误？ [英] How can I resolve this link error in Visual Studio (LNK2005)?

问题描述

我一直存在以下形式的链接器错误：

libcmtd.dll msvmrtd.dll 某些元素（例如：_mkdir ）已经定义了
...

，我不知道如何解决。 p>

以下是完整的错误消息：

private：__thiscall type_info :: type_info（ class type_info const&）
（?? type_info @@ AAE @ ABV0 @@ Z）已在
LIBCMTD.lib（typinfo.obj）中定义

MSVCRTD.lib（ti_inst.obj）：错误LNK2005：专用：类type_info&
__thiscall type_info :: operator =（class type_info const&）（?? 4type_info @@ AAEAAV0 @ ABV0 @@ Z）已在
LIBCMTD.lib（typinfo.obj）中定义

您能帮我解决这个问题吗？

解决方案

检查几件事：

1. 头文件是否受到保护，即它们是否具有 #ifndef 警卫。




2. 您是否在没有内联




3. 是否要在.cpp文件中定义模板，所有模板定义都必须在头文件。

请发布一些代码和确切的错误文本！

I keep having linker errors of the following form:

libcmtd.dll msvmrtd.dll some element(ex: _mkdir ) already defined...

and I don't know how to resolve them.

Here is a complete error message:

private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)

MSVCRTD.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_info const &)" (??4type_info@@AAEAAV0@ABV0@@Z) already defined in LIBCMTD.lib(typinfo.obj)

Can you help me solve this issue?

解决方案

Check a few things:

1. Are your header files guarded. I.e. do they have #ifndef guards.

2. Are you defining (non-template) functions in headers without the inline keyword. That messes lots of stuff up.

3. Are you trying to define templates in a .cpp file. All template definitions need to be in headers.

Post some code and exact error text please!

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