Universal-CSharp/Build.cmd at master · MinimalWindowsDev/Universal-CSharp · GitHub

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@echo off
setlocal enabledelayedexpansion
title C# Compiler Selector (Hybrid)

:MENU
echo ========================================================
echo   Select a Compiler
echo ========================================================
echo.
echo  [1] .NET SDK 10.0.101 (Roslyn) [Targets .NET 10]
echo  [2] Visual Studio "18" (Roslyn) [Targets .NET 8 ]
echo  [3] .NET Framework 4.0 (64-bit) [Targets .NET 4.0]
echo.
echo ========================================================
set /p choice="Enter ID (1-3): "

REM --- SELECTION LOGIC ---

set "MODE=LEGACY"
set "TARGET_TFM="
set "TARGET_VERSION="
set "DEFINES="

if "%choice%"=="1" (
    REM OPTION 1: .NET SDK 10 - Use SDK Reference Assemblies
    set "REF_PATH=%ProgramFiles%\dotnet\packs\Microsoft.NETCore.App.Ref\10.0.1\ref\net10.0"
    set "SELECTED_CSC=%ProgramFiles%\dotnet\sdk\10.0.101\Roslyn\bincore\csc.exe"
    set "MODE=MODERN"
    set "TARGET_TFM=net10.0"
    set "TARGET_VERSION=10.0.0"
    set "DEFINES=/define:REF_NET10"
    set "BUILD_FLAGS=/nologo /noconfig /nostdlib"
)

if "%choice%"=="2" (
    REM OPTION 2: Visual Studio 18 Roslyn - Target .NET 8
    REM Fallback to VS-bundled runtime assemblies (requires System.Private.CoreLib)
    set "REF_PATH=%ProgramFiles%\Microsoft Visual Studio\18\Community\dotnet\net8.0\runtime\shared\Microsoft.NETCore.App\8.0.21"
    set "USE_PRIVATE_CORELIB=1"
    set "SELECTED_CSC=%ProgramFiles%\Microsoft Visual Studio\18\Community\MSBuild\Current\Bin\Roslyn\csc.exe"
    set "MODE=MODERN"
    set "TARGET_TFM=net8.0"
    set "TARGET_VERSION=8.0.0"
    set "DEFINES=/define:REF_NET8"
    set "BUILD_FLAGS=/nologo /noconfig /nostdlib"
)

if "%choice%"=="3" (
    REM OPTION 3: Legacy .NET Framework 4.0
    set "SELECTED_CSC=%windir%\Microsoft.NET\Framework64\v4.0.30319\csc.exe"
    set "DEFINES=/define:REF_FX40"
    set "BUILD_FLAGS=/nologo"
)

if not defined SELECTED_CSC (
    echo Invalid selection.
    exit /b
)

REM --- COMPILE & RUN ---

if exist Universal.exe del Universal.exe

echo Using compiler: "%SELECTED_CSC%"
echo Target Mode:    %MODE%
if defined TARGET_TFM echo Target TFM:     %TARGET_TFM%
if defined REF_PATH echo Ref Path:       "!REF_PATH!"
echo.

if "%MODE%"=="MODERN" (
    REM Generate the appropriate runtimeconfig.json
    echo [Step 0] Generating runtimeconfig.json for %TARGET_TFM%...
    (
        echo {
        echo   "runtimeOptions": {
        echo     "tfm": "%TARGET_TFM%",
        echo     "framework": {
        echo       "name": "Microsoft.NETCore.App",
        echo       "version": "%TARGET_VERSION%"
        echo     }
        echo   }
        echo }
    ) > Universal.runtimeconfig.json

    REM Build the reference flags
    set "REF_FLAGS=/r:"!REF_PATH!\System.Runtime.dll" /r:"!REF_PATH!\System.Console.dll" /r:"!REF_PATH!\System.Runtime.Extensions.dll" /r:"!REF_PATH!\System.Runtime.InteropServices.RuntimeInformation.dll""

    if defined USE_PRIVATE_CORELIB (
        set "REF_FLAGS=/r:"!REF_PATH!\System.Private.CoreLib.dll" !REF_FLAGS!"
    )

    echo [Step 1] Compiling against %TARGET_TFM% References...
    echo          Defines: %DEFINES%
    "%SELECTED_CSC%" %BUILD_FLAGS% %DEFINES% !REF_FLAGS! /out:Universal.exe Universal.cs

    if !ERRORLEVEL! NEQ 0 (
        echo.
        echo [ERROR] Compilation Failed.
        exit /b
    )

    echo.
    echo [Step 2] Execution ^(via dotnet host^)...
    echo --------------------------------------------------------
    dotnet Universal.exe
)

if "%MODE%"=="LEGACY" (
    echo [Step 1] Compiling against .NET 4.0 GAC...
    echo          Defines: %DEFINES%
    "%SELECTED_CSC%" %BUILD_FLAGS% %DEFINES% /out:Universal.exe Universal.cs

    if !ERRORLEVEL! NEQ 0 (
        echo.
        echo [ERROR] Compilation Failed.
        exit /b
    )

    echo.
    echo [Step 2] Execution ^(Native Windows^)...
    echo --------------------------------------------------------
    Universal.exe
)