Circle compiler support

[kassane]

Circle compiler is a new C++20 compiler. It's written from scratch and designed for easy extension.
Allowing you to explore even more of the compile time. Although it is Linux only.

More info: https://github.com/seanbaxter/circle

Examples

C language:

#include<stdio.h>

int main(void) {
   printf("Hello printf at runtime\n");
   @meta printf("Hello printf at compile time\n");

    return 0;
}

Output:

$> ./circle sanity.c
Hello printf at comple time
$> ./sanity
Hello printf at runtime

---

C++ language:

#include<iostream>

int main() {
   std::cout << "Hello cout at runtime\n";
   @meta std::cout << "Hello cout at compile time\n";

    return 0;
}

Output:

$> ./circle sanity.cxx
Hello cout at compile time
$> ./sanity
Hello cout at runtime

[waruqi]

done

xmake f --toolchain=circle
xmake