调用 `clock()` 会出错：未定义对 `_times' 的引用

Question

I'm trying to use the clock() function in my C++ code but it's not working. I've tried adding #include <time.h> or #include <ctime> but it hasn't helped. I'm using Atmel Studio.

#include <time.h>

int main(void)
{
        clock_t myClock = clock();
}

There shouldn't be an error, but I'm getting the following error messages:

recipe for target 'SAMS70.elf' failed
undefined reference to `_times'
ld returned 1 exit status

Does anyone have an idea why this might be happening?

Answer 1

MCU's normally do not expose processor use time. A library clock function calls the expected _times function to get the value, but the function is not defined for MCU for the reason stated above.