More -Wmissing-variable-declarations fixes.

In addition to adding missing `static' keywords:
- bin/dd: Pull in `extern.h' to guarantee consistency with source file.
- libexec/rpc.rusersd: Move shared globals into an extern.h.
- libexec/talkd: Move `debug' and `hostname' into extern.h.
- usr.bin/cksum: Put counters in extern.h, as they are used by ckdist/mtree.
- usr.bin/m4: Move `end_result' into extern.h.
- usr.sbin/services_mkdb: Move shared globals into an extern.h.

5 files changed, 10 insertions, 12 deletions

diff --git a/libexec/talkd/announce.c b/libexec/talkd/announce.c
index 869197e..83c96b7 100644
--- a/libexec/talkd/announce.c
+++ b/libexec/talkd/announce.c
@@ -60,8 +60,6 @@ static const char rcsid[] =
 #include "ttymsg.h"
 #include "extern.h"
 
-extern char hostname[];
-
 /*
  * Announce an invitation to talk.
  */
diff --git a/libexec/talkd/extern.h b/libexec/talkd/extern.h
index cb231a9..a91cb25 100644
--- a/libexec/talkd/extern.h
+++ b/libexec/talkd/extern.h
@@ -25,6 +25,9 @@
  * $FreeBSD$
  */
 
+extern int debug;
+extern char hostname[];
+
 int	announce(CTL_MSG *, const char *);
 int	delete_invite(u_int32_t);
 void	do_announce(CTL_MSG *, CTL_RESPONSE *);
diff --git a/libexec/talkd/process.c b/libexec/talkd/process.c
index 18ddc42..1c5108f 100644
--- a/libexec/talkd/process.c
+++ b/libexec/talkd/process.c
@@ -63,8 +63,6 @@ static const char rcsid[] =
 
 #include "extern.h"
 
-extern int debug;
-
 void
 process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
 {
diff --git a/libexec/talkd/table.c b/libexec/talkd/table.c
index dcaed9c..5ad7b61 100644
--- a/libexec/talkd/table.c
+++ b/libexec/talkd/table.c
@@ -64,8 +64,7 @@ static const char rcsid[] =
 
 #define NIL ((TABLE_ENTRY *)0)
 
-extern	int debug;
-struct	timeval tp;
+static struct timeval tp;
 
 typedef struct table_entry TABLE_ENTRY;
 
@@ -78,7 +77,7 @@ struct table_entry {
 
 static void delete(TABLE_ENTRY *);
 
-TABLE_ENTRY *table = NIL;
+static TABLE_ENTRY *table = NIL;
 
 /*
  * Look in the table for an invitation that matches the current
diff --git a/libexec/talkd/talkd.c b/libexec/talkd/talkd.c
index e81cec6..56ce441 100644
--- a/libexec/talkd/talkd.c
+++ b/libexec/talkd/talkd.c
@@ -69,13 +69,13 @@ static const char rcsid[] =
 
 #include "extern.h"
 
-CTL_MSG		request;
-CTL_RESPONSE	response;
+static CTL_MSG		request;
+static CTL_RESPONSE	response;
 
-int	debug = 0;
-long	lastmsgtime;
+int			debug = 0;
+static long		lastmsgtime;
 
-char	hostname[MAXHOSTNAMELEN];
+char			hostname[MAXHOSTNAMELEN];
 
 #define TIMEOUT 30
 #define MAXIDLE 120