How to Compile Multiple C Files and Integrate Libraries in Visual Studio Code?

Compiling Multiple C Files in Visual Studio Code

When compiling multiple C files using Visual Studio Code, it's essential to understand the behavior of the g compiler. By default, g only compiles the selected cpp file, excluding any included .h files associated with it.

To resolve this issue and correctly compile all files, adjust the build task command within Visual Studio Code. Instead of using "g ${file}", modify the target file to "g ${fileDirname}/**.cpp". This directive instructs g to compile all .cpp files within the specified directory.

Example

Consider the following files:

• a.h:

int func();

• a.cpp:

#include <iostream>
#include "a.h"
using namespace std;

int func() {
    return 111;
}

• main.cpp:

#include "a.h"
using namespace std;

int main() {
    int b = func();
    cout << b << endl;
}

By setting the build task to "g ${fileDirname}/**.cpp", Visual Studio Code will automatically compile both a.cpp and main.cpp, resolving the 'Undefined symbols for architecture x86_64' error.

Integrating Libraries

To incorporate libraries such as FFMpeg, add the following steps:

1. Ensure you have the FFMpeg library installed on your system.
2. Create a new folder for your project.
3. Place your C files and FFMpeg headers in the project folder.
4. Open Visual Studio Code and create a tasks.json file.
5. Configure the build task to include the FFMpeg include path and library path. For example:

<code class="json">{
  "version": "2.0.0",
  "tasks": [
    {
      "type": "cppbuild",
      "label": "C/C++: g++ build active file",
      "command": "g++",
      "args": [
        "-o",
        "${workspaceFolder}/${fileDirname}/${fileBasenameNoExtension}.exe",
        "${file}",
        "-I",
        "/usr/local/include",
        "-L",
        "/usr/local/lib",
        "-lffmpeg"
      ],
      "problemMatcher": "$gcc"
    }
  ]
}</code>

This configuration will instruct the compiler to include the FFMpeg header files from "/usr/local/include" and link against the FFMpeg library located at "/usr/local/lib".

By following these steps, you can effectively compile multiple C files and integrate external libraries in Visual Studio Code.

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