Why is clang compilation so slow? [closed]

I recently downloaded clang (built from source) and wanted to test it. I am using this simple program:

#include <stdio.h>int main() {    return 0;}

Clang to 17.53 seconds to compile it! I tried out gcc, and it only took 0.5 seconds. Why is clang so slow!? If it helps I am using clang 11.0.0 and am on Windows 7 32-bit.