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-rw-r--r--builtin-update-index.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/builtin-update-index.c b/builtin-update-index.c
index 97b9ea61f7..a64a752990 100644
--- a/builtin-update-index.c
+++ b/builtin-update-index.c
@@ -28,6 +28,7 @@ static int mark_skip_worktree_only;
#define MARK_FLAG 1
#define UNMARK_FLAG 2
+__attribute__((format (printf, 1, 2)))
static void report(const char *fmt, ...)
{
va_list vp;