How to build a C++ static library with Visual Studio command tools?

The next step to create a static library is to create library source code and build the library .lib file as shown in this tutorial:

1. Create the C++ source file, MathFuncsLib.cpp, with a text editor:

// MathFuncsLib.cpp
// compile with: cl /c /EHsc MathFuncsLib.cpp
// post-build command: lib MathFuncsLib.obj

#include "MathFuncsLib.h"
#include <stdexcept>

using namespace std;

namespace MathFuncs
{
    double MyMathFuncs::Add(double a, double b)
    {
        return a + b;
    }

    double MyMathFuncs::Subtract(double a, double b)
    {
        return a - b;
    }

    double MyMathFuncs::Multiply(double a, double b)
    {
        return a * b;
    }

    double MyMathFuncs::Divide(double a, double b)
    {
        return a / b;
    }
}

2. Compile MathFuncsLib.cpp into MathFuncsLib.obj with Visual Studio command "cl":

C:\fyicenter>cl /c /EHsc MathFuncsLib.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.10.25019 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.

MathFuncsLib.cpp

C:\fyicenter>dir MathFuncsLib.*
08:40 AM               578 MathFuncsLib.cpp
08:15 AM               413 MathFuncsLib.h
09:08 AM             1,025 MathFuncsLib.obj

3. Build MathFuncsLib.obj into MathFuncsLib.lib with Visual Studio command "lib":

C:\fyicenter>lib MathFuncsLib.obj
Microsoft (R) Library Manager Version 14.10.25019.0
Copyright (C) Microsoft Corporation.  All rights reserved.

C:\fyicenter>dir MathFuncsLib.*
08:40 AM               578 MathFuncsLib.cpp
08:15 AM               413 MathFuncsLib.h
09:12 AM             1,648 MathFuncsLib.lib
09:08 AM             1,025 MathFuncsLib.obj

4. Send two files to whoever wants to use your library:

• Header file: MathFuncsLib.h - Needed to compile any C++ source code that uses your library.
• Library file: MathFuncsLib.lib - Needed to build executables (.exe and .dll files) that uses your library.

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