info ("Starting.");
+  printf ("printf\n");
+  g_print ("g_print\n");
+  g_printerr ("g_printerr\n");
+  info ("info");
+  warning ("warning");
+  error ("error");
+  errno = EINVAL;
+  syserror ("syserror");
+  g_debug ("g_debug");
+  g_info ("g_info");
+  g_message ("g_message");
+  g_warning ("g_warning");
+  g_critical ("g_critical");
+  g_error ("g_error");

output:

<6>Starting.
printf
g_print
g_printerr
<6>info
<4>warning
<3>error
<3>syserror: Invalid argument
<7>g_debug
<6>g_info
g_message
<4>g_warning
<3>g_critical
<3>g_error
Trace/breakpoint trap (core dumped)