c++ debug not working when debugging the c++ extension

[wangzhankun]

I pressed F5 to debug the c++ extension, and in the loaded vscode I press F5 to debug C++ code. But it only run the tasks defined in tasks.json, cannot launch the gdb to debug my c++ code.

I can debug my c++ code in normal mode with c++ extension.

I didn't change any code of c++ extension, the tasks.json and launch.json in my c++ project is:

tasks.json

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "BuildAndDebug",
            "command": "make",
            "args": [
            ],
            "options": {
                "cwd": "${workspaceFolder}"
            },
            "problemMatcher": [
                {
                    "pattern": [
                        {
                            "regexp": ".",
                            "file": 1,
                            "location": 2,
                            "message": 3
                        }
                    ],
                    "background": {
                        "activeOnStart": true,
                        "beginsPattern": ".",
                        "endsPattern": ".",
                    }
                }
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "调试器生成的任务。",
            "isBackground": false,
        }
    ],
    "version": "2.0.0"
}

launch.json

{
    // 使用 IntelliSense 了解相关属性。 
    // 悬停以查看现有属性的描述。
    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(gdb) 启动",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceRoot}/build/linux/x86_64/debug/c++",
            "args": [],
            "stopAtEntry": true,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "为 gdb 启用整齐打印",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                },
                {
                    "description": "将反汇编风格设置为 Intel",
                    "text": "-gdb-set disassembly-flavor intel",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "BuildAndDebug"
        }

    ]
}