When compiled with -fno-common, global variables that are declared
multple times cause an error.  With -fcommon (the default), they are
merged.

Declaring such variable multiple times is probably not a good idea, and
is definitely not necessary.

This patch changes all the global variables defined in include files to
be explicitly "extern", and where necessary, adds the variable
declaration to a suitable .c file.

To test, run
  CFLAGS=-fno-common ./configure
  make

Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
 utils/mountd/v4root.c        |  2 --
 utils/nfsdcld/cld-internal.h | 10 +++++-----
 utils/nfsdcld/nfsdcld.c      |  6 ++++++
 utils/statd/statd.c          |  1 +
 utils/statd/statd.h          |  2 +-
 5 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/utils/mountd/v4root.c b/utils/mountd/v4root.c
index d735dbfe192d..dd9828eb0c11 100644
--- a/utils/mountd/v4root.c
+++ b/utils/mountd/v4root.c
@@ -28,8 +28,6 @@
 #include "v4root.h"
 #include "pseudoflavors.h"
 
-int v4root_needed;
-
 static nfs_export pseudo_root = {
 	.m_next = NULL,
 	.m_client = NULL,
diff --git a/utils/nfsdcld/cld-internal.h b/utils/nfsdcld/cld-internal.h
index 05f01be2105a..cc283dae9dbf 100644
--- a/utils/nfsdcld/cld-internal.h
+++ b/utils/nfsdcld/cld-internal.h
@@ -35,10 +35,10 @@ struct cld_client {
 	} cl_u;
 };
 
-uint64_t current_epoch;
-uint64_t recovery_epoch;
-int first_time;
-int num_cltrack_records;
-int num_legacy_records;
+extern uint64_t current_epoch;
+extern uint64_t recovery_epoch;
+extern int first_time;
+extern int num_cltrack_records;
+extern int num_legacy_records;
 
 #endif /* _CLD_INTERNAL_H_ */
diff --git a/utils/nfsdcld/nfsdcld.c b/utils/nfsdcld/nfsdcld.c
index 2ad1001988d2..be6556262504 100644
--- a/utils/nfsdcld/nfsdcld.c
+++ b/utils/nfsdcld/nfsdcld.c
@@ -69,6 +69,12 @@ static int 		inotify_fd = -1;
 static struct event	pipedir_event;
 static bool old_kernel = false;
 
+uint64_t current_epoch;
+uint64_t recovery_epoch;
+int first_time;
+int num_cltrack_records;
+int num_legacy_records;
+
 static struct option longopts[] =
 {
 	{ "help", 0, NULL, 'h' },
diff --git a/utils/statd/statd.c b/utils/statd/statd.c
index 8eef2ff24fe8..e4a1df43b73f 100644
--- a/utils/statd/statd.c
+++ b/utils/statd/statd.c
@@ -67,6 +67,7 @@ static struct option longopts[] =
 };
 
 extern void sm_prog_1 (struct svc_req *, register SVCXPRT *);
+stat_chge	SM_stat_chge;
 
 #ifdef SIMULATIONS
 extern void simulator (int, char **);
diff --git a/utils/statd/statd.h b/utils/statd/statd.h
index 231ac7e0764b..bb1fecbb6a51 100644
--- a/utils/statd/statd.h
+++ b/utils/statd/statd.h
@@ -41,7 +41,7 @@ extern void	load_state(void);
 /*
  * Host status structure and macros.
  */
-stat_chge		SM_stat_chge;
+extern stat_chge	SM_stat_chge;
 #define MY_NAME		SM_stat_chge.mon_name
 #define MY_STATE	SM_stat_chge.state
 
-- 
2.24.1