在C语言中,usleep函数用于让进程休眠指定的微秒数。要使用这个函数,必须在源文件中包含unistd.h头文件。如果忘记包含这个头文件,编译器就会发出“implicit declaration of function ‘usleep’”的警告,意思是隐式声明了函数usleep,即编译器在源代码中没有找到usleep函数的声明。 为了解决这个问题,你需要在调用usleep函数...
warning: implicit declaration of function ‘usleep’ 昨天遇到一个编译报错: 该问题是由于https://blog.csdn.net/yuangc/article/details/122318786引起的。 继续查看手册: 要求glibc 2.10之后的 _POSIX_C_SOURCE不能 >= 200809L,而open_memstream又要大于200809L。这两者冲突了。 幸好后面有或者:/* Glibc ...
Then we give the physical dimensions of the screen, the colour depth and the type of surface we're drawing. From the documentation in the SDL_video.h we know that this declaration defines a surface in system memory (as opposed to one in video memory). To the terminal we print a message...
For now, there's also the option to define one of the older POSIX standards to re-enable usleep(). And lastly, we provide aWERRORCMake switch that can be turned off you don't want warnings to act as errors (it's on by default). ...
解决方案: 我在编写头文件时 void LED_Init 敲成了void LED_H;导致main函数编译出现warning:implicit declaration of function 'LED_Init ’ is invalid in C99 结语:刚接触stm32 感觉这比51难 难 难上好多呀… 希望这篇博文能帮到大家。版权声明:本文为m0_54355842原创文章,遵循 CC 4.0 BY-SA 版权协议,转...