From a24f57285fe53d359b21bbe253c38288c9d26031 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 23 Apr 2026 18:23:08 +0300
Subject: [PATCH] pref: fix build failed with msvc 2022 (fixes #14784)

---
 vlib/v/pref/pref_test.v      | 29 +++++++++++++++++++++++++++++
 vlib/v/pref/should_compile.v |  4 ++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/vlib/v/pref/pref_test.v b/vlib/v/pref/pref_test.v
index 18acab9b0..50adee0f2 100644
--- a/vlib/v/pref/pref_test.v
+++ b/vlib/v/pref/pref_test.v
@@ -119,6 +119,35 @@ fn new_wasm_preferences() pref.Preferences {
 	}
 }
 
+fn new_c_preferences() pref.Preferences {
+	return pref.Preferences{
+		backend: .c
+		os:      .linux
+		arch:    .amd64
+	}
+}
+
+fn test_c_backend_filters_backend_specific_files() {
+	prefs := new_c_preferences()
+	dir := os.join_path(os.vtmp_dir(), 'c_backend_filters')
+	filtered := prefs.should_compile_filtered_files(dir, [
+		'mod.c.v',
+		'mod.js.v',
+		'mod.v',
+		'mod.wasm.v',
+	])
+	assert filtered == [
+		os.join_path(dir, 'mod.c.v'),
+		os.join_path(dir, 'mod.v'),
+	]
+}
+
+fn test_c_backend_skips_modules_with_only_non_c_variants() {
+	prefs := new_c_preferences()
+	filtered := prefs.should_compile_filtered_files('sus', ['sus.js.v', 'sus.wasm.v'])
+	assert filtered.len == 0
+}
+
 fn test_wasm_backend_filters_backend_specific_files() {
 	prefs := new_wasm_preferences()
 	dir := os.join_path(os.vtmp_dir(), 'wasm_backend_filters')
diff --git a/vlib/v/pref/should_compile.v b/vlib/v/pref/should_compile.v
index 530b2875d..767fd8bf2 100644
--- a/vlib/v/pref/should_compile.v
+++ b/vlib/v/pref/should_compile.v
@@ -246,8 +246,8 @@ fn (prefs &Preferences) bsd_specific_file_kind(file string) string {
 
 // TODO: Rework this using is_target_of()
 pub fn (prefs &Preferences) should_compile_c(file string) bool {
-	if file.ends_with('.js.v') {
-		// Probably something like `a.js.v`.
+	if file.ends_with('.js.v') || file.ends_with('.wasm.v') {
+		// Probably something like `a.js.v` or `a.wasm.v`.
 		return false
 	}
 	if prefs.is_bare && file.ends_with('.freestanding.v') {
-- 
2.39.5