[Tarantool-patches] [PATCH v2 2/2] bitset: replace zero-length array with flexible-array member

Artem Starshov artemreyt at tarantool.org
Fri Nov 27 15:43:10 MSK 2020

Zero-lenght arrays are GNU C extension.
There's ISO C99 flexible array member, which
is preffered mechanism to declare variable-length types.

Flexible array member allows us to avoid applying sizeof
operator cause it's incomplete type, so it will be an error
at compile time. There're any moments else why it's better
way to implement such structures via FAM:

In this issue it fixed gcc 10 warning:
"warning: writing 1 byte into
a region of size 0 [-Wstringop-overflow=]"

Closes #4966
Closes #5564
 src/lib/bitset/bitset.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/bitset/bitset.h b/src/lib/bitset/bitset.h
index e2ae4f5f6..775de5c07 100644
--- a/src/lib/bitset/bitset.h
+++ b/src/lib/bitset/bitset.h
@@ -69,7 +69,7 @@ struct tt_bitset_page {
 	size_t first_pos;
 	rb_node(struct tt_bitset_page) node;
 	size_t cardinality;
-	uint8_t data[0];
+	uint8_t data[];
 typedef rb_tree(struct tt_bitset_page) tt_bitset_pages_t;

More information about the Tarantool-patches mailing list