Automatically rebuild your program when you run it

autobuild.c

#ifndef _AUTO_BUILD_H_
#define _AUTO_BUILD_H_

#include <stdlib.h>

#ifndef AUTOBUILD_TARGET
#ifdef _WIN32
#define AUTOBUILD_TARGET "autobuild.exe"
#else
#define AUTOBUILD_TARGET "./autobuild"
#endif
#endif

int autobuild_strcmp(const char *s1, const char *s2) {
    while (*s1 && (*s1 == *s2)) {
        s1++;
        s2++;
    }
    return *(const unsigned char *)s1 - *(const unsigned char *)s2;
}

int __MAIN__();

int main(int argc, char **argv) {
	if (autobuild_strcmp(argv[0], AUTOBUILD_TARGET) != 0) {
		system(BUILD_COMMAND);
		system(AUTOBUILD_TARGET);
		exit(0);
	}
	return __MAIN__(argc, argv);
}

#define main __MAIN__

#endif /* _AUTO_BUILD_H_ */

/*///////////////////////////////////
	
		Testing:
		
///////////////////////////////////*/

//make your build system output "autobuild"
//any change in BUILD_COMMAND needs manual compilation
//for any other changes in the program, just run the program again, it will build itself
#define BUILD_COMMAND "echo \"running my build system\" && gcc main.c -o autobuild"
#include "autobuild.h"

#include <stdio.h>

int main(void) {
	int n = 0;
	
	printf("Change this number and reopen the program: %i\n", n);
	
	return 0;
}