Self-running source

C

Set the executable bit on the following polyglot C/shell source file:

#if 0
gcc -Wall $0 && exec ./a.out; exit 1
#endif

#include <stdio.h>

int main(int argc, char *argv[])
{
        printf("Hello world!\n");
        return 0;
}

This is my favourite version because:

• readable (e.g. no multiline comments)
• minimal boilerplate
• only runs the program if it compiled successfully
• exits with 1 if there was an error

See also

• https://coderwall.com/p/e1htcg/self-compiling-source-code
• https://twitter.com/dannas_/status/1238066416286400512