feat: force windows msvc to use cl.exe instead of cl-clang.exe to build ten_runtime_nodejs.node

.gnfiles/build/toolchain/msvc/msvc.gni

@@ -16,6 +16,15 @@ template("msvc_toolchain") {
   }
 
   toolchain(target_name) {
+    # Allow callers to override build arguments for this toolchain context.
+    # For example, msvc_force sets is_clang=false so that all targets built
+    # under it use MSVC-compatible flags.
+    if (defined(invoker.toolchain_args)) {
+      toolchain_args = {
+        forward_variables_from(invoker.toolchain_args, "*")
+      }
+    }
+
     lib_switch = ""
     lib_dir_switch = "/LIBPATH:"
 

.gnfiles/build/toolchain/msvc_force/BUILD.gn

@@ -0,0 +1,32 @@
+#
+# Copyright © 2025 Agora
+# This file is part of TEN Framework, an open source project.
+# Licensed under the Apache License, Version 2.0, with certain conditions.
+# Refer to the "LICENSE" file in the root directory for more information.
+#
+# A dedicated MSVC toolchain that always uses cl.exe, even when the global
+# is_clang=true. Used for targets that are incompatible with clang-cl
+# (e.g., ten_runtime_nodejs.node).
+#
+# Setting is_clang=false via toolchain_args ensures all targets built under
+# this toolchain use MSVC-compatible compiler flags.
+
+import("//.gnfiles/build/toolchain/msvc/msvc.gni")
+
+environment_file = rebase_path("${root_out_dir}/environment.${target_cpu}")
+exec_script("//.gnfiles/build/scripts/setup_vs.py",
+            [
+              "$vs_version",
+              "$host_cpu",
+              "$target_cpu",
+              environment_file,
+            ],
+            "list lines")
+
+msvc_toolchain("msvc_force") {
+  environment = environment_file
+  use_clang = false
+  toolchain_args = {
+    is_clang = false
+  }
+}