From f77aae2c23c385fa8133f9a116e45521b2ea332c Mon Sep 17 00:00:00 2001
From: Krchi <997054144@qq.com>
Date: Thu, 8 Jan 2026 12:12:23 +0800
Subject: [PATCH] builder,wasm: fix pointer size to 4 for `-b wasm` before the
 checker stage (#26281)

---
 vlib/v/builder/builder.v          | 2 +-
 vlib/v/gen/wasm/gen.v             | 1 -
 vlib/v/gen/wasm/tests/cast.vv     | 3 +++
 vlib/v/gen/wasm/tests/cast.vv.out | 1 +
 4 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/gen/wasm/tests/cast.vv
 create mode 100644 vlib/v/gen/wasm/tests/cast.vv.out

diff --git a/vlib/v/builder/builder.v b/vlib/v/builder/builder.v
index cb5e1dc64..3796a56b5 100644
--- a/vlib/v/builder/builder.v
+++ b/vlib/v/builder/builder.v
@@ -62,7 +62,7 @@ pub fn new_builder(pref_ &pref.Preferences) Builder {
 	if pref_.use_color == .never {
 		util.emanager.set_support_color(false)
 	}
-	table.pointer_size = if pref_.m64 { 8 } else { 4 }
+	table.pointer_size = if pref_.m64 && pref_.backend != .wasm { 8 } else { 4 }
 	mut msvc := MsvcResult{}
 	if pref_.ccompiler == 'msvc' {
 		$if windows {
diff --git a/vlib/v/gen/wasm/gen.v b/vlib/v/gen/wasm/gen.v
index 2a0455059..b22ce0272 100644
--- a/vlib/v/gen/wasm/gen.v
+++ b/vlib/v/gen/wasm/gen.v
@@ -1498,7 +1498,6 @@ pub fn gen(files []&ast.File, mut table ast.Table, out_name string, w_pref &pref
 		stack_top: stack_top
 		data_base: calc_align(stack_top + 1, 16)
 	}
-	g.table.pointer_size = 4
 	g.mod.assign_memory('memory', true, 1, none)
 
 	if g.pref.is_debug {
diff --git a/vlib/v/gen/wasm/tests/cast.vv b/vlib/v/gen/wasm/tests/cast.vv
new file mode 100644
index 000000000..81d7fedc3
--- /dev/null
+++ b/vlib/v/gen/wasm/tests/cast.vv
@@ -0,0 +1,3 @@
+fn main() {
+	println(u32(usize(0)))
+}
diff --git a/vlib/v/gen/wasm/tests/cast.vv.out b/vlib/v/gen/wasm/tests/cast.vv.out
new file mode 100644
index 000000000..c22708346
--- /dev/null
+++ b/vlib/v/gen/wasm/tests/cast.vv.out
@@ -0,0 +1 @@
+0
\ No newline at end of file
-- 
2.39.5