Adding multiple executables in CMake

Adding multiple executables in CMake is a relatively straightforward process. CMake is a powerful build system for managing software builds, maintaining high portability across multiple platforms. Here are the steps to add multiple executables in CMake:

1. Create the CMakeLists.txt file

First, you need a CMakeLists.txt file, which is CMake's configuration file. In this file, you will define all build rules and dependencies.

2. Specify the minimum CMake version and project name

At the top of the CMakeLists.txt file, you need to specify the minimum required CMake version and project name. For example:

cmake
cmake_minimum_required(VERSION 3.10)
project(MyProject)

3. Add multiple executables

To add multiple executables, you need to use the add_executable() function. Each executable can specify source files. For example, if you have two programs, one is main1.cpp, and the other is main2.cpp, you can set them up as follows:

cmake
add_executable(executable1 main1.cpp)
add_executable(executable2 main2.cpp)

4. Configure optional compiler options

You can set specific compiler options for your project using the target_compile_options() function. For example, setting the C++ standard for the first executable:

cmake
target_compile_features(executable1 PRIVATE cxx_std_11)

5. Add library dependencies (if necessary)

If your executable depends on other libraries (either custom or third-party), you can link them using target_link_libraries(). For example:

cmake
target_link_libraries(executable1 PRIVATE my_library)

6. Build the project

Once your CMakeLists.txt file is configured, you can use CMake to generate build files and compile your project. This typically involves the following steps:

bash
mkdir build
cd build
cmake ..
make

These commands will create a Makefile in the build directory, which is then used with make to build your application.

Example: Real-world application

Suppose you are developing a software that includes two programs: one for data processing, and another for result presentation. You can create a source file for each program, such as data_processor.cpp and result_viewer.cpp, and then create executables for them in CMake as described above.

This approach ensures that different parts of the project can be built independently, and you can easily add or update programs from the source control system without affecting other parts. This is a good practice in project management that improves code maintainability and extensibility.