From 32a1d933fedaa4e177a6338a4364bc38506a84c6 Mon Sep 17 00:00:00 2001
From: yuyi98 <yuyi98@163.com>
Date: Fri, 8 Apr 2022 12:28:37 +0800
Subject: [PATCH] fix optional with empty struct

---
 vlib/json/json_decode_with_optional_arg_test.v | 4 +---
 vlib/v/gen/c/cgen.v                            | 2 +-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/vlib/json/json_decode_with_optional_arg_test.v b/vlib/json/json_decode_with_optional_arg_test.v
index 3aba409bf1..97b4932b8b 100644
--- a/vlib/json/json_decode_with_optional_arg_test.v
+++ b/vlib/json/json_decode_with_optional_arg_test.v
@@ -1,9 +1,7 @@
 import json
 import os
 
-struct DbConfig {
-	foo int
-}
+struct DbConfig {}
 
 fn test_json_decode_with_optional_arg() {
 	if ret := print_info() {
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index c77803429a..317d953a3f 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -972,7 +972,7 @@ fn (g Gen) optional_type_text(styp string, base string) string {
 	ret := 'struct $styp {
 	byte state;
 	IError err;
-	byte data[sizeof($size)];
+	byte data[sizeof($size) > 0 ? sizeof($size) : 1];
 }'
 	return ret
 }