From d30227b8508c61e472d9014ec1e32ed5bb22136b Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Tue, 14 Apr 2026 12:45:34 +0300
Subject: [PATCH] cgen: Building with MSVC Results in Error with Mutable Static
 Strings (fixes #25541)

---
 .../mut_static_string_runtime_init.c.must_have      |  4 ++++
 .../c/testdata/mut_static_string_runtime_init.out   |  2 ++
 .../c/testdata/mut_static_string_runtime_init.vv    | 13 +++++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 vlib/v/gen/c/testdata/mut_static_string_runtime_init.c.must_have
 create mode 100644 vlib/v/gen/c/testdata/mut_static_string_runtime_init.out
 create mode 100644 vlib/v/gen/c/testdata/mut_static_string_runtime_init.vv

diff --git a/vlib/v/gen/c/testdata/mut_static_string_runtime_init.c.must_have b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.c.must_have
new file mode 100644
index 000000000..f6616b47d
--- /dev/null
+++ b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.c.must_have
@@ -0,0 +1,4 @@
+static string stored_text;
+static bool _vstatic_init_
+if (!_vstatic_init_
+stored_text = _S("   ");
diff --git a/vlib/v/gen/c/testdata/mut_static_string_runtime_init.out b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.out
new file mode 100644
index 000000000..0a72fced9
--- /dev/null
+++ b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.out
@@ -0,0 +1,2 @@
+MyText
+MyText
diff --git a/vlib/v/gen/c/testdata/mut_static_string_runtime_init.vv b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.vv
new file mode 100644
index 000000000..0dd3fd6c2
--- /dev/null
+++ b/vlib/v/gen/c/testdata/mut_static_string_runtime_init.vv
@@ -0,0 +1,13 @@
+// vtest vflags: -gc none
+
+@[unsafe]
+fn set_get_static_text(text string) string {
+	mut static stored_text := '   '
+	if text != '' {
+		stored_text = text
+	}
+	return stored_text
+}
+
+println(unsafe { set_get_static_text('MyText') })
+println(unsafe { set_get_static_text('') })
-- 
2.39.5