how to use vscode c++ debugger to pass arguments to program through gdb?

Question

I want to debug quickjs qjsc which accepts arguments from c++ argv, and I also hope everyone can debug quickjs based my configuration for learning javascript engine.

But I can't pass arguments to program through gdb debugger in vscode

Here are my vscode launch.json

{
  // Use IntelliSense to learn about possible attributes.
  // Hover to view descriptions of existing attributes.
  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
  "version": "0.2.0",
  "configurations": [
    {
      "name": "qjs-debug main.js",
      "type": "cppdbg",
      "request": "launch",
      "program": "${workspaceRoot}/qjs-debug",
      "args": [
        "-I",
        "${workspaceFolder}/debugger/main.js"
      ],
      "stopAtEntry": true,
      "cwd": "${workspaceFolder}",
      "environment": [],
      "externalConsole": false,
      "MIMode": "gdb",
      "setupCommands": [
        {
          "description": "Enable pretty-printing for gdb",
          "text": "-enable-pretty-printing",
          "ignoreFailures": true
        }
      ],
      "logging": {"engineLogging": true},
      "preLaunchTask": "gcc build active file",
      "miDebuggerPath": "/usr/bin/gdb",
      "miDebuggerArgs": "--args"
    }
  ]
}

when I start debug, I saw argv only have a /

Some anwsers said args in launch.json will pass to gdb, you should use --args instead.

But I have tried. Nothing works :(

My question is:

How I pass args to command cli based program?

Why argv is / from picture?

---

My repo is

https://github.com/iamwwc/quickjs-debugger

You can get all configuration from my github.

Answer 1

Problem is not in VSCode launch configuration but in the way your program read the inputs, @Marek R said in the comments.

It is recommended to use int main(int argc, char* argv[]) { body } instead of int main(int argc, char **argv) { body } (see here).