Day - Configuring NixOS to use the C debbuger in VSCode

I install all my packages in environment.systemPackages in /etc/nixos/configuration.nix.

So, in addition to gcc, to use debbuger you need:

environment.systemPackages = with pkgs; [
...
vscode-fhs
gdb
]

Using vscode-fhs makes the work much easier, installing the vscode package (without fhs) causes some inconvenience. More information here.

In vscode, install this extension:

For greater reliability, I "forced" the creation of paths with:

environment.variables.PATH = "${lib.makeBinPath [
pkgs.gdb
pkgs.gcc_multi // esse é o pacote que utilizo pro gcc
]}:$PATH";

Don't forget to restart your computer after sudo nixos-rebuild switch

Within the project, create a .vscode folder and add a launch.json and tasks.json file

tasks.json:

{
  "tasks": [
    {
      "type": "cppbuild",
      "label": "C/C++: gcc arquivo de build ativo",
      "command": "/nix/store/2ap4rlj55kw8q5ndycl0r8w312ggpf1c-gcc-wrapper-13.2.0/bin/gcc",
      "args": [
        "-fdiagnostics-color=always",
        "-g",
        "${file}",
        "-o",
        "${fileDirname}/${fileBasenameNoExtension}"
      ],
      "options": {
        "cwd": "${fileDirname}"
      },
      "problemMatcher": [
        "$gcc"
      ],
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "detail": "Tarefa gerada pelo Depurador."
    }
  ],
  "version": "2.0.0"
}

launch.json:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Debug arquivo ativo",
      "type": "cppdbg",
      "request": "launch",
      "program": "${fileDirname}/${fileBasenameNoExtension}",
      "args": [],
      "cwd": "${fileDirname}",
      "environment": [],
      "externalConsole": false,
      "MIMode": "gdb",
      "setupCommands": [
        {
          "description": "Enable pretty-printing for gdb",
          "text": "-enable-pretty-printing",
          "ignoreFailures": true
        }
      ],
      "miDebuggerPath": "/nix/store/2ap4rlj55kw8q5nd2460r8w312ggpf1c-gdb-14.2/bin/gdb",  
      "preLaunchTask": "C/C++: gcc arquivo de build ativo",
      "internalConsoleOptions": "openOnSessionStart"
    }
  ]
}

For the command field in tasks.json, use the which gcc command to get the path.
Do the same for launch.json's miDebuggerPath with the command which gdb

Enter the file you want to debug and press F5:

Debug and be happy.

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