cursource
if (compile_time == COMPILING && cursource() != NULL)
fprintf(stderr, " source file %s", cursource());
if (compile_time == COMPILING && cursource() != NULL)
fprintf(stderr, " source file %s", cursource());
if (compile_time == 1 && cursource() != NULL) {
dprintf(STDERR_FILENO, " source file %s", cursource());
extern char *cursource(void);