按照微软的官方文档（https://go.microsoft.com/fwlink/?LinkID=533484#vscode）配置好C++环境之后。
每次按F5都会在终端输出，但是会附加一串信息。例如：
hello world [1] + Done "/usr/bin/gdb" --interpreter=mi --tty=${DbgTerm} 0<"/tmp/Microsoft-MIEngine-In-tih6ti0q.cz0" 1>"/tmp/Microsoft-MIEngine-Out-s6ibdwj6.pwh"
实际上这些信息是我们发送到gdb的命令，以允许终端使用VS Code。
更确切的说
"The text you are seeing is the command we need to send to gdb to redirect its stdin/stdout/stderr so that we can communicate with it from the debug adapter. In changing to allow integratedTerminal, we also chose to allow VS Code to handle all the terminal launching for external console too due to a request by the community to support more than just xTerm and gnomeTerminal."
解决方案是在launch.json中添加：
"miDebuggerArgs": "-q -ex quit; wait() { fg >/dev/null; }; /bin/gdb -q --interpreter=mi"
参考github之vscode项目issue地址：
https://github.com/microsoft/vscode-cpptools/issues/3298