vscode不能命中断点如何解决？

vscode c++ 编译生成后,调试时无法命中断点的解决办法

//test.cpp
#include 
int g_var = 0;
void print_line(char *str)
{
    if (str != NULL)
        printf("%s\r\n", str);
    else
        printf("null string\r\n");
}
int main (int argc, char **argv)
{
    int l_var = 1;
    print_line("hello world!");
    printf("g_var = %d, l_var = %d.\r\n", g_var, l_var);
    return 0;
}

launch.json

{
        "version": "0.2.0",
        "configurations": [
            {
                "name": "(gdb) Launch",
                "type": "cppdbg",
                "request": "launch",
                "program": "${workspaceRoot}/test.exe",
                "args": [],
                "stopAtEntry": false,
                "cwd": "${workspaceRoot}",
                "environment": [],
                "externalConsole": true,
                "MIMode": "gdb",
                "miDebuggerPath": "C:\\MinGW\\bin\\gdb.exe",
                "setupCommands": [
                    {
                        "description": "Enable pretty-printing for gdb",
                        "text": "-enable-pretty-printing",
                        "ignoreFailures": true
                    }
                ]
            }
        ]
    }

tasks.json

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "taskName": "test",
            "type": "shell",
            "command": "g++",
            "args": ["-g", "${file}", "-o", "${workspaceRoot}/test.exe"]
        }
    ]
}

编译成功后，在源码中设置断点，却无法命中断点。

后来查看官方c++编译调试文档和尝试，在launch.json文件的

"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
]

后面加上

"preLaunchTask": "test" 配置，调试时就可以正常命中断点了。

注意：别忘了"setupCommands"的中括号’ ] ‘后面加上一个逗号。