-void inform(char *fmt, ...);
-void adios (const char *, const char *, ...) NORETURN;
-void admonish (char *, char *, ...);
-void advertise (const char *, char *, const char *, va_list);
-void advise (const char *, const char *, ...);
+void inform(char *fmt, ...) CHECK_PRINTF(1, 2);
+void adios (const char *, const char *, ...) CHECK_PRINTF(2, 3) NORETURN;
+void admonish (char *, char *, ...) CHECK_PRINTF(2, 3);
+void advertise (const char *, char *, const char *, va_list) CHECK_PRINTF(3, 0);
+void advise (const char *, const char *, ...) CHECK_PRINTF(2, 3);