[ndctl PATCH v3] ndctl/lib: fix symbol redefinitions reported by GCC10

[ndctl PATCH v3] ndctl/lib: fix symbol redefinitions reported by GCC10

[Vishal Verma]

A toolchain update in Fedora 32 caused new compile errors due to
multiple definitions of dimm_ops structures. The declarations in
'private.h' for the various NFIT families are present so that libndctl
can find all the per-family dimm-ops. However they need to be declared
as extern because the actual definitions are in <family>.c.
Additionally, 'param' instances in list.c and monitor.c need to be
marked as static.

Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Eric Sandeen <sandeen@redhat.com>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---

v3: Remove unrelated changes to Makefile.am from this patch (Eric).

 ndctl/lib/private.h | 8 ++++----
 ndctl/list.c        | 2 +-
 ndctl/monitor.c     | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/ndctl/lib/private.h b/ndctl/lib/private.h
index e445301..16bf8f9 100644
--- a/ndctl/lib/private.h
+++ b/ndctl/lib/private.h
@@ -343,10 +343,10 @@ struct ndctl_dimm_ops {
 	int (*xlat_firmware_status)(struct ndctl_cmd *);
 };
 
-struct ndctl_dimm_ops * const intel_dimm_ops;
-struct ndctl_dimm_ops * const hpe1_dimm_ops;
-struct ndctl_dimm_ops * const msft_dimm_ops;
-struct ndctl_dimm_ops * const hyperv_dimm_ops;
+extern struct ndctl_dimm_ops * const intel_dimm_ops;
+extern struct ndctl_dimm_ops * const hpe1_dimm_ops;
+extern struct ndctl_dimm_ops * const msft_dimm_ops;
+extern struct ndctl_dimm_ops * const hyperv_dimm_ops;
 
 static inline struct ndctl_bus *cmd_to_bus(struct ndctl_cmd *cmd)
 {
diff --git a/ndctl/list.c b/ndctl/list.c
index 125a9fe..12d78d8 100644
--- a/ndctl/list.c
+++ b/ndctl/list.c
@@ -59,7 +59,7 @@ static unsigned long listopts_to_flags(void)
 	return flags;
 }
 
-struct util_filter_params param;
+static struct util_filter_params param;
 
 static int did_fail;
 
diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index b8ee27f..1755b87 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -45,7 +45,7 @@ struct monitor_dimm {
 	struct list_node list;
 };
 
-struct util_filter_params param;
+static struct util_filter_params param;
 
 static int did_fail;
 
-- 
2.21.1
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