.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "type": "lldb",
            "request": "launch",
            "name": "Debug",
            "program": "${workspaceFolder}/${fileBasenameNoExtension}",
            "args": [],
            "cwd": "${workspaceFolder}",
            "preLaunchTask": "Build with Clang"
        }
    ]
}

 .vscode/tasks.json

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "Build with Clang",//这个任务的名字在launch.json最后一项配置
            "type": "shell",
            "command": "clang++",
            "args": [
                "-std=c++17",
                "-stdlib=libc++",
                "${fileBasenameNoExtension}.cpp",
                "-o",
                "${fileBasenameNoExtension}",
                "--debug"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            }
        }
    ]
}

要先安装扩展 ：codeLLDB

 我的xcode是正常可以工作的，是闲得蛋疼才去搞这个试下的。