Why Won't My Multi-File C Project Build in VS Code?

Troubleshooting: Building C Programs with Multiple Source Files in VS Code

When working with multi-file C projects in VS Code, users may encounter build errors related to missing source files. One common scenario is when the compiler fails to locate a specific .cpp file, despite the corresponding header file being accessible.

Issue Description:

The user is unable to build a C program that consists of multiple .cpp files using the GCC compiler in VS Code on Ubuntu 17.10. The program compiles without issues in other IDEs, but the tasks.json configuration in VS Code seems to cause the problem.

Understanding the tasks.json Configuration:

The tasks.json file is used to define tasks for VS Code, including build tasks. In the given case, the tasks.json defines a single build task labeled "Build." The task uses a GCC command that compiles only the main.cpp file, omitting the Cat.cpp file.

Resolving the Issue:

To rectify this, the user needs to modify the tasks.json configuration to instruct the compiler to include all .cpp files in the build process. The following code snippet should be added to the tasks.json file:

        "label": "g++.exe build active file",
        "args": [
            "-g",
            "${fileDirname}\**.cpp",
            "-o",
            "${fileDirname}\${fileBasenameNoExtension}.exe",
        ],

This configuration tells the compiler to include all .cpp files in the current directory and its subdirectories using the glob pattern "**.cpp."

Launch Configuration:

To ensure that the pre-build task is executed before launching the program, add the following line to the launch.json configuration:

"preLaunchTask": "g++.exe build active file"

Additional Notes:

If the source files are organized in separate folders, the compiler may still be unable to locate them. In such cases, ensure that the appropriate include paths are specified in the project settings.

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