Executing a shared library on Unix
The below definition of main is responsible for printing the output you see. It is defined in csu/version.c of the source tree of glibc. I hope this helps.
#ifdef HAVE_ELF/* This function is the entry point for the shared object. Running the library as a program will get here. */extern void __libc_main (void) __attribute__ ((noreturn));void__libc_main (void){ __libc_print_version (); _exit (0);}#endif