I am trying to build a very simple C++ unit test project. The setup

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Asked: May 27, 20262026-05-27T06:00:30+00:00 2026-05-27T06:00:30+00:00

I am trying to build a very simple C++ unit test project. The setup

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I am trying to build a very simple C++ unit test project. The setup is just so happened to be exactly the same as what this blog described. I built a static library TestLib.lib and a C++ unit test project called TestProject. Both projects are using platform toolset v100.

The Testlib contains only one class.

BaseClass.h

#pragma once 

class BaseClass
{
public:
    void Method1();
};

BaseClass.cpp

#include "BaseClass.h"
#include <iostream>
#include <list>

using namespace std;

void BaseClass::Method1()
{
    list<int> dummy(0);
    cout << "Hello world";
}

The TestProject has only one test case.

#include "BaseClass.h"
#include <list>
.
.
.
[TestMethod]
void TestMethod1()
{
    BaseClass b;
    b.Method1();
};

It looks like if I have a #include <list> after #include "BaseClass.h" (in the test.cpp) I will have the following link error. If I take out the #include <list>, I have no link error at all.

TestLib.lib(BaseClass.obj) : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/INCREMENTAL:NO' specification
MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std.basic_string<char,std::char_traits<char>,std::allocator<char> >): (0x0200003d).
MSVCMRT.lib(locale0_implib.obj) : error LNK2022: metadata operation failed (8013118D) : Inconsistent layout information in duplicated types (std.basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> >): (0x02000063).
LINK : fatal error LNK1255: link failed because of metadata errors

The link error will be gone if I add one more line to the test program, like this:

#include "BaseClass.h"
#include <list>
.
.
.
[TestMethod]
void TestMethod1()
{
    std::list<int> dummy(0);
    BaseClass b;
    b.Method1();
};

However, now, I have two link warnings. I am not sure whether they are related to the previous link errors.

TestLib.lib(BaseClass.obj) : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/INCREMENTAL:NO' specification
LINK : warning LNK4098: defaultlib 'MSVCRTD' conflicts with use of other libs; use /NODEFAULTLIB:library

Can anybody explain why? Do I miss something obvious here?