在vscode中开发arduino编译巨慢解决办法

每次在vscode中, 编译Arduino花费的时间巨长，等的好烦，仔细一看每次在Arduino 输出控制台上会出现一个警告

[Warning] Output path is not specified. Unable to reuse previously compiled files. Upload could be slow. See README.

只需在.vscode -> arduino.json文件中将输出目录 output 配置一下就可以大大提高二次下载的编译速度。

{
  "board": "Arduino_STM32:STM32F1:genericSTM32F103C",
  "sketch": "small-car\\main.ino",
  "port": "COM8",
  "programmer": "Arduino as ISP",
  "configuration": "device_variant=STM32F103C8,upload_method=DFUUploadMethod,cpu_speed=speed_72mhz,opt=osstd",
  "output": "./build",
  "debugger": "stlink"
}