CMake project with subdirectories and static library

static, Boost, static link

I propose to write a small application that will have two subdirectories. One of which will compile the executable file, and the second will contain a statically linked library.

As a result, the project will look like this.

Root CMakeLists.txt

The main CMakeLists.txt will contain the connection of all subdirectories.

cmake_minimum_required (VERSION 3.8)

project (Example)

add_subdirectory (MyStaticLibrary)
add_subdirectory (ExampleStatic)

MyStaticLibrary

Next comes the static library, which will have a class that returns a Hello World message.

CMakeLists.txt

cmake_minimum_required (VERSION 3.8)

project(MyStaticLibrary)

set(SOURCE_FILES "MyStaticLibrary.cpp")
set(HEADER_FILES "MyStaticLibrary.h")

# We declare the project as a static library and add all the source code files to it.
add_library(MyStaticLibrary STATIC ${HEADER_FILES} ${SOURCE_FILES})

MyStaticLibrary.h

#pragma once

#include <string>

class MyStaticLibrary
{
public:
    static std::string getMyStaticMessage();
};

MyStaticLibrary.cpp

#include "MyStaticLibrary.h"

std::string MyStaticLibrary::getMyStaticMessage()
{
    return "Hello world from static library";
}

ExampleStatic

And this is a project for creating a binary and it contains the main.cpp file with the main function.

CMakeLists.txt

cmake_minimum_required (VERSION 3.8)

project(ExampleStatic)

set(SOURCE_FILES "main.cpp")

add_executable (ExampleStatic ${SOURCE_FILES})

# Connecting the library, specify where to get the header files
include_directories("../MyStaticLibrary")
# And also we specify dependence on static library
target_link_libraries(ExampleStatic MyStaticLibrary)

main.cpp

#include <iostream>

#include "MyStaticLibrary.h"

using namespace std; 

int main()
{
    cout << MyStaticLibrary::getMyStaticMessage() << endl;
    return 0;
}

Conclusion

As a conclusion, here is the result of the work of the program with this statically added library.