From 7e3715ed2593d6a27e417cf299c58cc3b4e1d740 Mon Sep 17 00:00:00 2001
From: kbkpbot <kbkpbot@sina.com>
Date: Sat, 27 Dec 2025 14:43:34 +0800
Subject: [PATCH] markused: fix option none markused (fix #26147) (#26151)

---
 vlib/v/gen/c/testdata/const_none_memdup.c.must_have | 1 +
 vlib/v/gen/c/testdata/const_none_memdup.out         | 0
 vlib/v/gen/c/testdata/const_none_memdup.vv          | 4 ++++
 vlib/v/markused/walker.v                            | 3 ++-
 4 files changed, 7 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/gen/c/testdata/const_none_memdup.c.must_have
 create mode 100644 vlib/v/gen/c/testdata/const_none_memdup.out
 create mode 100644 vlib/v/gen/c/testdata/const_none_memdup.vv

diff --git a/vlib/v/gen/c/testdata/const_none_memdup.c.must_have b/vlib/v/gen/c/testdata/const_none_memdup.c.must_have
new file mode 100644
index 000000000..f810a82b6
--- /dev/null
+++ b/vlib/v/gen/c/testdata/const_none_memdup.c.must_have
@@ -0,0 +1 @@
+voidptr builtin__memdup(voidptr src, isize sz);
diff --git a/vlib/v/gen/c/testdata/const_none_memdup.out b/vlib/v/gen/c/testdata/const_none_memdup.out
new file mode 100644
index 000000000..e69de29bb
diff --git a/vlib/v/gen/c/testdata/const_none_memdup.vv b/vlib/v/gen/c/testdata/const_none_memdup.vv
new file mode 100644
index 000000000..6ad921c6c
--- /dev/null
+++ b/vlib/v/gen/c/testdata/const_none_memdup.vv
@@ -0,0 +1,4 @@
+
+fn main() {
+	_ := [?string('abc')]!
+}
diff --git a/vlib/v/markused/walker.v b/vlib/v/markused/walker.v
index b2b3c4b1f..5897a609d 100644
--- a/vlib/v/markused/walker.v
+++ b/vlib/v/markused/walker.v
@@ -1436,7 +1436,8 @@ fn (mut w Walker) mark_resource_dependencies() {
 		w.fn_by_name('malloc')
 		w.fn_by_name('tos3')
 	}
-	if w.uses_memdup || w.used_none > 0 {
+	if w.uses_memdup || w.used_none > 0 || w.used_option > 0 {
+		// used_option => used_none => use memdup
 		w.fn_by_name('memdup')
 	}
 	if w.uses_debugger {
-- 
2.39.5