gcc: zero-sized array to fexlible array C99

Switch remaining zero sized struct to flexible arrays to be C99
complient.

These simple rules should apply:

- The incomplete array type must be the last element within the structure.
- There cannot be an array of structures that contain a flexible array member.
- Structures that contain a flexible array member cannot be used as a member of another structure.
- The structure must contain at least one named member in addition to the flexible array member.

Although some of the code pieces should be still improved.

4 files changed, 9 insertions, 9 deletions

diff --git a/libdm/datastruct/hash.c b/libdm/datastruct/hash.c
index 4c940039a..726347ea2 100644
--- a/libdm/datastruct/hash.c
+++ b/libdm/datastruct/hash.c
@@ -20,7 +20,7 @@ struct dm_hash_node {
 	void *data;
 	unsigned data_len;
 	unsigned keylen;
-	char key[0];
+	char key[];
 };
 
 struct dm_hash_table {
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index e9b140563..059b96f0b 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -165,20 +165,20 @@ struct dm_info {
 struct dm_deps {
 	uint32_t count;
 	uint32_t filler;
-	uint64_t device[0];
+	uint64_t device[];
 };
 
 struct dm_names {
 	uint64_t dev;
 	uint32_t next;		/* Offset to next struct from start of this struct */
-	char name[0];
+	char name[];
 };
 
 struct dm_versions {
 	uint32_t next;		/* Offset to next struct from start of this struct */
 	uint32_t version[3];
 
-	char name[0];
+	char name[];
 };
 
 int dm_get_library_version(char *version, size_t size);
diff --git a/libdm/libdm-stats.c b/libdm/libdm-stats.c
index 5379bed5e..f8d79d807 100644
--- a/libdm/libdm-stats.c
+++ b/libdm/libdm-stats.c
@@ -65,7 +65,7 @@ struct dm_histogram {
 	const struct dm_stats_region *region;
 	uint64_t sum; /* Sum of histogram bin counts. */
 	int nr_bins; /* Number of histogram bins assigned. */
-	struct dm_histogram_bin bins[0];
+	struct dm_histogram_bin bins[];
 };
 
 /*
diff --git a/libdm/misc/dm-ioctl.h b/libdm/misc/dm-ioctl.h
index 52a7a93d1..55dee2148 100644
--- a/libdm/misc/dm-ioctl.h
+++ b/libdm/misc/dm-ioctl.h
@@ -183,7 +183,7 @@ struct dm_target_spec {
 struct dm_target_deps {
 	uint32_t count;	/* Array size */
 	uint32_t padding;	/* unused */
-	uint64_t dev[0];	/* out */
+	uint64_t dev[];		/* out */
 };
 
 /*
@@ -193,7 +193,7 @@ struct dm_name_list {
 	uint64_t dev;
 	uint32_t next;		/* offset to the next record from
 				   the _start_ of this */
-	char name[0];
+	char name[];
 };
 
 /*
@@ -203,7 +203,7 @@ struct dm_target_versions {
         uint32_t next;
         uint32_t version[3];
 
-        char name[0];
+        char name[];
 };
 
 /*
@@ -212,7 +212,7 @@ struct dm_target_versions {
 struct dm_target_msg {
 	uint64_t sector;	/* Device sector */
 
-	char message[0];
+	char message[];
 };
 
 /*