Add text to gdbreplay --help output

I noticed that gdbreplay --help is rather sparse -- it doesn't even
mention the names of the options it accepts.

This patch updates the help output to be more complete.

Approved-By: Andrew Burgess <aburgess@redhat.com>

1 files changed, 29 insertions, 3 deletions

diff --git a/gdbserver/gdbreplay.cc b/gdbserver/gdbreplay.cc
index 951f50e..5c7821a 100644
--- a/gdbserver/gdbreplay.cc
+++ b/gdbserver/gdbreplay.cc
@@ -474,8 +474,29 @@ static void
 gdbreplay_usage (FILE *stream)
 {
   fprintf (stream, "Usage:\tgdbreplay LOGFILE HOST:PORT\n");
-  if (REPORT_BUGS_TO[0] && stream == stdout)
-    fprintf (stream, "Report bugs to \"%s\".\n", REPORT_BUGS_TO);
+}
+
+static void
+gdbreplay_help ()
+{
+  gdbreplay_usage (stdout);
+
+  printf ("\n");
+  printf ("LOGFILE is a file generated by 'set remotelogfile' in gdb.\n");
+  printf ("COMM may either be a tty device (for serial debugging),\n");
+  printf ("HOST:PORT to listen for a TCP connection, or '-' or 'stdio' to use\n");
+  printf ("stdin/stdout of gdbserver.\n");
+  printf ("\n");
+
+  printf ("Options:\n\n");
+  printf ("  --debug-logging       Show packets as they are processed.\n");
+  printf ("  --help                Print this message and then exit.\n");
+  printf ("  --version             Display version information and then exit.\n");
+  if (REPORT_BUGS_TO[0])
+    {
+      printf ("\n");
+      printf ("Report bugs to \"%s\".\n", REPORT_BUGS_TO);
+    }
 }
 
 /* Main function.  This is called by the real "main" function,
@@ -503,11 +524,16 @@ captured_main (int argc, char *argv[])
 	  gdbreplay_version ();
 	  exit (0);
 	case OPT_HELP:
-	  gdbreplay_usage (stdout);
+	  gdbreplay_help ();
 	  exit (0);
 	case OPT_LOGGING:
 	  debug_logging = true;
 	  break;
+
+	case '?':
+	  fprintf (stderr,
+		   "Use 'gdbreplay --help' for a complete list of options.\n");
+	  exit (1);
 	}
     }