标签：code pre 判断 usb bsp [] error event sign
1,#error在编译期进行警告判断
eg: #if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */ #error event_bits[] is too short! #endif
C编译相关
原文地址：https://www.cnblogs.com/hellokitty2/p/9343649.html
