Day - Configure NixOS to use the C debugger in VSCode

I installed all packages in environment.systempackages in /etc/nixos/configuration.nix.

So, in addition to gcc, to use a debugger, you also need:

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

Using vscode-fhs makes work easier, and installing vscode packages (without fhs) can cause some inconvenience. For more information, please click here.

In vscode, install this extension:

To improve reliability, I "force" to create the path:

 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 the sudo nixos-rebuild switch

In the project, create a .vscode folder and add the launch.json and tasks.json files

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}"
      },
      "problematcher": [
        "$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 command fields in tasks.json, use the which gcc command to get the path.
Use the command which gdb

Do the same for launch.json's midebuggerpath

Enter the file to debug and press f5:

Debug and be happy.

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