doc,build,win: update docs with clang

Updated BUILDING.md to make ClangCL mandatory for new versions of Node.
Forcing clang-cl flag in vcbuild if not specified, thus disabling MSVC.

PR-URL: #57991
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: StefanStojanovic

BUILDING.md

@@ -634,7 +634,10 @@ Refs:
   [Visual Studio 2022 (17.6 or newer)](https://visualstudio.microsoft.com/downloads/)
   or the "C++ build tools" workload from the
   [Build Tools](https://aka.ms/vs/17/release/vs_buildtools.exe),
-  with the default optional components
+  with the default optional components. Starting with Node.js v24, ClangCL is required to compile
+  on Windows. To enable it, two additional components are needed:
+  * C++ Clang Compiler for Windows (Microsoft.VisualStudio.Component.VC.Llvm.Clang)
+  * MSBuild support for LLVM toolset (Microsoft.VisualStudio.Component.VC.Llvm.ClangToolset)
 * Basic Unix tools required for some tests,
   [Git for Windows](https://git-scm.com/download/win) includes Git Bash
   and tools which can be included in the global `PATH`.
@@ -658,13 +661,6 @@ Optional requirements for compiling for Windows on ARM (ARM64):
   * Visual C++ ATL for ARM64
 * Windows 10 SDK 10.0.17763.0 or newer
 
-Optional requirements for compiling with ClangCL (search for `clang` in Visual Studio
-Installer's "individual component" tab):
-
-* Visual Studio individual components
-  * C++ Clang Compiler for Windows
-  * MSBuild support for LLVM toolset
-
 NOTE: Currently we only support compiling with Clang that comes from Visual Studio.
 
 When building with ClangCL, if the output from `vcbuild.bat` shows that the components are not installed

tools/bootstrap/windows_boxstarter

@@ -18,7 +18,7 @@ choco install python3 -y
 
 # Installs VS 2022 Build Tools
 choco install visualstudio2022buildtools -y
-choco install visualstudio2022-workload-vctools -y --params="--add Microsoft.VisualStudio.Component.VC.Tools.ARM64 --add Microsoft.VisualStudio.Component.VC.ATL.ARM64"
+choco install visualstudio2022-workload-vctools -y --params="--add Microsoft.VisualStudio.Component.VC.Tools.ARM64 --add Microsoft.VisualStudio.Component.VC.ATL.ARM64 --add Microsoft.NetCore.Component.SDK --add Microsoft.VisualStudio.Component.VC.Llvm.Clang --add Microsoft.VisualStudio.Component.VC.Llvm.ClangToolset"
 
 # NASM
 choco install nasm -y

vcbuild.bat

@@ -237,6 +237,14 @@ if errorlevel 1 echo Could not find NASM, install it or build with openssl-no-as
 
 call :getnodeversion || exit /b 1
 
+@REM Forcing ClangCL usage for version 24 and above
+set NODE_MAJOR_VERSION=
+for /F "tokens=1 delims=." %%i in ("%NODE_VERSION%") do set "NODE_MAJOR_VERSION=%%i"
+if %NODE_MAJOR_VERSION% GEQ 24 (
+  echo Using ClangCL because the Node.js version being compiled is >= 24.
+  set clang_cl=1
+)
+
 if defined TAG set configure_flags=%configure_flags% --tag=%TAG%
 
 if not "%target%"=="Clean" goto skip-clean