basic incremental build

misc/build.bat

@@ -4,159 +4,93 @@ setlocal enabledelayedexpansion
 :: ------------------------------------------------------------------------------
 :: Unity Build Script (misc/build.bat)
 :: Step 1: Use FASTBuild to generate unity .cpp files directly in Intermediate/
-:: Step 2: Invoke compiler (clang-cl / cl) directly on target unity files
+:: Step 2: Invoke compiler directly on target unity files
 :: ------------------------------------------------------------------------------
 
 set SCRIPT_DIR=%~dp0
 cd /d "%SCRIPT_DIR%.."
 
 set FBUILD=misc\fbuild.exe
+set HELPER=powershell -NoProfile -ExecutionPolicy Bypass -File "%SCRIPT_DIR%build_helper.ps1"
 
 set TARGET_JULIET=0
 set TARGET_ROMEO=0
 set TARGET_SHADER=0
 set TARGET_GAME=0
-set TARGET_COUNT=0
+set TARGET_SPECIFIED=0
 
 set CONFIG_DEBUG=0
 set CONFIG_RELEASE=0
 set CONFIG_PROFILE=0
-set CONFIG_COUNT=0
+set CONFIG_SPECIFIED=0
 
 :parse_args
 if "%~1"=="" goto check_defaults
-
+if /i "%~1"=="debug" set CONFIG_DEBUG=1& set CONFIG_SPECIFIED=1
-if /i "%~1"=="debug" (
+if /i "%~1"=="release" set CONFIG_RELEASE=1& set CONFIG_SPECIFIED=1
-    set CONFIG_DEBUG=1
+if /i "%~1"=="profile" set CONFIG_PROFILE=1& set CONFIG_SPECIFIED=1
-    set /a CONFIG_COUNT+=1
+if /i "%~1"=="juliet" set TARGET_JULIET=1& set TARGET_SPECIFIED=1
-    shift
+if /i "%~1"=="game" set TARGET_GAME=1& set TARGET_SPECIFIED=1
-    goto parse_args
+if /i "%~1"=="romeo" set TARGET_ROMEO=1& set TARGET_SPECIFIED=1
-)
+if /i "%~1"=="shadercompiler" set TARGET_SHADER=1& set TARGET_SPECIFIED=1
-
-if /i "%~1"=="release" (
-    set CONFIG_RELEASE=1
-    set /a CONFIG_COUNT+=1
-    shift
-    goto parse_args
-)
-
-if /i "%~1"=="profile" (
-    set CONFIG_PROFILE=1
-    set /a CONFIG_COUNT+=1
-    shift
-    goto parse_args
-)
-
-if /i "%~1"=="juliet" (
-    set TARGET_JULIET=1
-    set /a TARGET_COUNT+=1
-    shift
-    goto parse_args
-)
-
-if /i "%~1"=="game" (
-    set TARGET_GAME=1
-    set /a TARGET_COUNT+=1
-    shift
-    goto parse_args
-)
-
-if /i "%~1"=="romeo" (
-    set TARGET_ROMEO=1
-    set /a TARGET_COUNT+=1
-    shift
-    goto parse_args
-)
-
-if /i "%~1"=="shadercompiler" (
-    set TARGET_SHADER=1
-    set /a TARGET_COUNT+=1
-    shift
-    goto parse_args
-)
-
 shift
 goto parse_args
 
 :check_defaults
-:: If no arguments passed ("build"), build ALL targets across ALL configurations (Debug, Profile, Release)
+if !CONFIG_SPECIFIED! equ 0 (
-if !CONFIG_COUNT! equ 0 if !TARGET_COUNT! equ 0 (
+    if !TARGET_SPECIFIED! equ 0 (
-    set CONFIG_DEBUG=1
+        set CONFIG_DEBUG=1& set CONFIG_RELEASE=1& set CONFIG_PROFILE=1
-    set CONFIG_RELEASE=1
+        set TARGET_JULIET=1& set TARGET_GAME=1& set TARGET_ROMEO=1& set TARGET_SHADER=1
-    set CONFIG_PROFILE=1
-    set TARGET_JULIET=1
-    set TARGET_GAME=1
-    set TARGET_ROMEO=1
-    set TARGET_SHADER=1
         goto start_build
-)
+    )
-
-:: If targets specified but no configs specified, default to Debug
-if !CONFIG_COUNT! equ 0 (
     set CONFIG_DEBUG=1
 )
-
+if !TARGET_SPECIFIED! equ 0 (
-:: If configs specified but no targets specified, build all targets for those configs
+    set TARGET_JULIET=1& set TARGET_GAME=1& set TARGET_ROMEO=1& set TARGET_SHADER=1
-if !TARGET_COUNT! equ 0 (
-    set TARGET_JULIET=1
-    set TARGET_GAME=1
-    set TARGET_ROMEO=1
-    set TARGET_SHADER=1
 )
 
 :start_build
-set START_TIME=%TIME%
+%HELPER% -Action StartBuild >nul 2>&1
-powershell -Command "$global:startTime = [System.Diagnostics.Stopwatch]::StartNew(); Set-Variable -Name GLOBAL_START_TIME -Value $global:startTime -Scope Global" >nul 2>&1
+if exist "Intermediate\built_outputs.tmp" del /f /q "Intermediate\built_outputs.tmp" >nul 2>&1
 
 if not exist "%FBUILD%" (
-    echo.
     echo [BUILD FAILED] Could not find %FBUILD%.
     exit /b 1
 )
 
-:: Find Clang / MSVC compiler
 set COMPILER=clang-cl.exe
 where %COMPILER% >nul 2>nul
-if %ERRORLEVEL% neq 0 (
+if !ERRORLEVEL! neq 0 (
     set COMPILER=cl.exe
+    where %COMPILER% >nul 2>nul
+    if !ERRORLEVEL! neq 0 (
+        echo [BUILD FAILED] Neither clang-cl.exe nor cl.exe was found in PATH.
+        exit /b 1
+    )
 )
 
-:: Store start timestamp in PowerShell variable for exact timing across batch routines
-powershell -Command "[System.IO.File]::WriteAllText('Intermediate\build_start.tmp', [System.DateTime]::Now.Ticks.ToString())" >nul 2>&1
-
-:: Clear temporary built output list file
-if exist "Intermediate\built_outputs.tmp" del "Intermediate\built_outputs.tmp"
-
 if !CONFIG_DEBUG! equ 1 call :build_config Debug
-if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
 
 if !CONFIG_PROFILE! equ 1 call :build_config Profile
-if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
 
 if !CONFIG_RELEASE! equ 1 call :build_config Release
-if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
-
-:: Calculate build elapsed time using PowerShell
-for /f "usebackq tokens=*" %%I in (`powershell -Command "$start = [long](Get-Content Intermediate\build_start.tmp); $elapsed = (New-Object System.TimeSpan ([System.DateTime]::Now.Ticks - $start)); Remove-Item Intermediate\build_start.tmp -ErrorAction SilentlyContinue; '{0:D2}:{1:D2}:{2:D2}.{3:D3}' -f $elapsed.Hours, $elapsed.Minutes, $elapsed.Seconds, $elapsed.Milliseconds"` ) do set ELAPSED_TIME=%%I
 
 echo.
 echo ==============================================================================
 echo [BUILD SUMMARY]
 echo ==============================================================================
 echo Compiler Used : %COMPILER%
-echo Total Duration : %ELAPSED_TIME%
+%HELPER% -Action FinishBuild
-echo Output Binaries:
-if exist "Intermediate\built_outputs.tmp" (
-    powershell -Command "Get-Content Intermediate\built_outputs.tmp | Get-Item | ForEach-Object { $size = '{0:N2} MB' -f ($_.Length / 1MB); Write-Host ('  - ' + $_.FullName.Replace((Get-Location).Path + '\', '') + ' (' + $size + ')') }"
-    del "Intermediate\built_outputs.tmp" >nul 2>&1
-)
 echo ==============================================================================
-echo [ALL BUILDS SUCCEEDED] All requested executables built successfully.
+echo [ALL BUILDS SUCCEEDED] All requested targets processed successfully.
 echo ==============================================================================
 exit /b 0
 
 :: ------------------------------------------------------------------------------
-:: Subroutine to build a specific configuration (Debug / Profile / Release)
+:: Build Configuration Subroutine
 :: ------------------------------------------------------------------------------
 :build_config
 set "CFG=%~1"
@@ -173,17 +107,48 @@ if !TARGET_GAME! equ 1 set FASTBUILD_TARGETS=!FASTBUILD_TARGETS! Game-Unity
 if !TARGET_ROMEO! equ 1 set FASTBUILD_TARGETS=!FASTBUILD_TARGETS! Romeo-Unity
 if !TARGET_SHADER! equ 1 set FASTBUILD_TARGETS=!FASTBUILD_TARGETS! JulietShaderCompiler-Unity
 
+%HELPER% -Action StartUnity >nul 2>&1
+
 "%FBUILD%" !FASTBUILD_TARGETS!
-if %ERRORLEVEL% neq 0 (
+if !ERRORLEVEL! neq 0 (
-    echo.
-    echo ==============================================================================
     echo [BUILD FAILED] FASTBuild failed to generate unity files for %CFG%.
-    echo ==============================================================================
+    exit /b !ERRORLEVEL!
-    exit /b %ERRORLEVEL%
 )
 
-:: Strip '#pragma message' from generated Unity files
+:: Evaluate all target needs in a single fast PowerShell pass
-powershell -Command "Get-ChildItem -Path Intermediate -Recurse -Filter '*_Unity*.cpp' | ForEach-Object { (Get-Content $_.FullName) | Where-Object { $_ -notmatch '#pragma message' } | Set-Content $_.FullName }"
+%HELPER% -Action EvaluateConfig -CFG "!CFG!" -TargetJuliet "!TARGET_JULIET!" -TargetGame "!TARGET_GAME!" -TargetRomeo "!TARGET_ROMEO!" -TargetShader "!TARGET_SHADER!" >nul 2>&1
+
+set FASTBUILD_UNITY_CHANGED=0
+set JULIET_NEED_COMPILE=0
+set IMGUI_NEED_COMPILE=0
+set GAME_NEED_COMPILE=0
+set JULIETAPP_NEED_COMPILE=0
+set ROMEO_NEED_COMPILE=0
+set SHADER_NEED_COMPILE=0
+
+if exist "Intermediate\config_status.tmp" (
+    for /f "usebackq tokens=1,2 delims==" %%A in ("Intermediate\config_status.tmp") do set %%A=%%B
+    del /f /q "Intermediate\config_status.tmp" >nul 2>&1
+)
+
+if !FASTBUILD_UNITY_CHANGED! equ 1 (
+    echo [FASTBuild] Unity structure or source file list changed.
+) else (
+    echo [FASTBuild] No Unity file structure changes detected [up-to-date].
+)
+
+set ANY_NEED_BUILD=0
+if !JULIET_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+if !IMGUI_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+if !GAME_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+if !JULIETAPP_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+if !ROMEO_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+if !SHADER_NEED_COMPILE! equ 1 set ANY_NEED_BUILD=1
+
+if !ANY_NEED_BUILD! equ 0 (
+    echo [SKIP / UP-TO-DATE] All requested targets in [%CFG%] are up-to-date.
+    exit /b 0
+)
 
 echo.
 echo ==============================================================================
@@ -208,79 +173,100 @@ if /i "!CFG!"=="Debug" (
 
 set COMMON_LIBS=kernel32.lib user32.lib gdi32.lib dxguid.lib Ws2_32.lib dxgi.lib imm32.lib dwmapi.lib d3dcompiler.lib shell32.lib winhttp.lib delayimp.lib
 
-:: Compile shared Juliet (and ImGui) Object Files into Intermediate\x64-!CFG!\
+:: --- Juliet Shared Objs ---
 echo.
 echo --- Compiling Shared Object Files (Juliet / ImGui) [%CFG%] ---
-%COMPILER% %COMPILER_FLAGS% /DJULIET_EXPORT /c Intermediate\Juliet\*.cpp /Fo"Intermediate\x64-!CFG!\\"
+if !JULIET_NEED_COMPILE! equ 0 (
-if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+    echo [SKIP / UP-TO-DATE] Intermediate\x64-!CFG!\Juliet_Unity*.obj [Unity files unchanged]
+) else (
+    echo [REBUILDING] Compiling Intermediate\x64-!CFG!\Juliet_Unity*.obj...
+    %COMPILER% %COMPILER_FLAGS% /DJULIET_EXPORT /c Intermediate\Juliet\*.cpp /Fo"Intermediate\x64-!CFG!\\"
+    if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+)
 
+:: --- ImGui Shared Objs ---
 if defined IMGUI_UNITY_SRCS (
+    if !IMGUI_NEED_COMPILE! equ 0 (
+        echo [SKIP / UP-TO-DATE] Intermediate\x64-!CFG!\ImGui_Unity*.obj [Unity files unchanged]
+    ) else (
+        echo [REBUILDING] Compiling Intermediate\x64-!CFG!\ImGui_Unity*.obj...
         %COMPILER% %COMPILER_FLAGS% /c !IMGUI_UNITY_SRCS! /Fo"Intermediate\x64-!CFG!\\"
-    if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+        if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+    )
 )
 
 set JULIET_OBJS=Intermediate\x64-!CFG!\Juliet_Unity*.obj
 set IMGUI_OBJS=
-if defined IMGUI_UNITY_SRCS (
+if defined IMGUI_UNITY_SRCS set IMGUI_OBJS=Intermediate\x64-!CFG!\ImGui_Unity*.obj
-    set IMGUI_OBJS=Intermediate\x64-!CFG!\ImGui_Unity*.obj
-)
 
 set BUILD_GAME_DLL=0
 if !TARGET_JULIET! equ 1 set BUILD_GAME_DLL=1
 if !TARGET_GAME! equ 1 set BUILD_GAME_DLL=1
 
-:: Compile Game.dll
+:: --- Game.dll ---
 if !BUILD_GAME_DLL! equ 1 (
     echo.
     echo --- Building Game.dll [%CFG%] ---
+    if !GAME_NEED_COMPILE! equ 0 (
+        echo [SKIP / UP-TO-DATE] bin\x64-!CFG!\Game.dll [Binary up to date, skipping compilation]
+    ) else (
+        echo [REBUILDING] Compiling bin\x64-!CFG!\Game.dll...
         %COMPILER% %COMPILER_FLAGS% /DJULIET_EXPORT /LD /Fe"bin\x64-!CFG!\Game.dll" ^
-        %JULIET_OBJS% ^
+            %JULIET_OBJS% Intermediate\Game\*.cpp %IMGUI_OBJS% ^
-        Intermediate\Game\*.cpp ^
-        %IMGUI_OBJS% ^
             /link %COMMON_LIBS% /INCREMENTAL /ILK:"Intermediate\x64-!CFG!\Game.ilk" /PDB:"Intermediate\x64-!CFG!\Game.pdb"
-    if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+        if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
         echo bin\x64-!CFG!\Game.dll>>Intermediate\built_outputs.tmp
+    )
 )
 
-:: Compile JulietApp Executable
+:: --- JulietApp.exe ---
 if !TARGET_JULIET! equ 1 (
     echo.
     echo --- Building JulietApp.exe [%CFG%] ---
+    if !JULIETAPP_NEED_COMPILE! equ 0 (
+        echo [SKIP / UP-TO-DATE] bin\x64-!CFG!\JulietApp.exe [Binary up to date, skipping compilation]
+    ) else (
+        echo [REBUILDING] Compiling bin\x64-!CFG!\JulietApp.exe...
         %COMPILER% %COMPILER_FLAGS% /Fe"bin\x64-!CFG!\JulietApp.exe" ^
-        Intermediate\JulietApp\*.cpp ^
+            Intermediate\JulietApp\*.cpp %IMGUI_OBJS% ^
-        %IMGUI_OBJS% ^
             /link %COMMON_LIBS% bin\x64-!CFG!\Game.lib /SUBSYSTEM:CONSOLE /INCREMENTAL /ILK:"Intermediate\x64-!CFG!\JulietApp.ilk" /PDB:"Intermediate\x64-!CFG!\JulietApp.pdb"
-    if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+        if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
         echo bin\x64-!CFG!\JulietApp.exe>>Intermediate\built_outputs.tmp
+    )
 )
 
-:: Compile Romeo Executable
+:: --- Romeo.exe ---
 if !TARGET_ROMEO! equ 1 (
     echo.
     echo --- Building Romeo.exe [%CFG%] ---
+    if !ROMEO_NEED_COMPILE! equ 0 (
+        echo [SKIP / UP-TO-DATE] bin\x64-!CFG!\Romeo.exe [Binary up to date, skipping compilation]
+    ) else (
+        echo [REBUILDING] Compiling bin\x64-!CFG!\Romeo.exe...
         %COMPILER% %COMPILER_FLAGS% /Fe"bin\x64-!CFG!\Romeo.exe" ^
-        %JULIET_OBJS% ^
+            %JULIET_OBJS% Intermediate\Romeo\*.cpp %IMGUI_OBJS% ^
-        Intermediate\Romeo\*.cpp ^
-        %IMGUI_OBJS% ^
             /link %COMMON_LIBS% /SUBSYSTEM:CONSOLE /INCREMENTAL /ILK:"Intermediate\x64-!CFG!\Romeo.ilk" /PDB:"Intermediate\x64-!CFG!\Romeo.pdb"
-    if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+        if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
         echo bin\x64-!CFG!\Romeo.exe>>Intermediate\built_outputs.tmp
+    )
 )
 
-:: Compile JulietShaderCompiler Executable
+:: --- JulietShaderCompiler.exe ---
 if !TARGET_SHADER! equ 1 (
     echo.
     echo --- Building JulietShaderCompiler.exe [%CFG%] ---
     if exist "Intermediate\JulietShaderCompiler\*.cpp" (
+        if !SHADER_NEED_COMPILE! equ 0 (
+            echo [SKIP / UP-TO-DATE] bin\x64-!CFG!\JulietShaderCompiler.exe [Binary up to date, skipping compilation]
+        ) else (
+            echo [REBUILDING] Compiling bin\x64-!CFG!\JulietShaderCompiler.exe...
             %COMPILER% %COMPILER_FLAGS% /I"JulietShaderCompiler" /Fe"bin\x64-!CFG!\JulietShaderCompiler.exe" ^
-            %JULIET_OBJS% ^
+                %JULIET_OBJS% Intermediate\JulietShaderCompiler\*.cpp %IMGUI_OBJS% ^
-            Intermediate\JulietShaderCompiler\*.cpp ^
-            %IMGUI_OBJS% ^
                 /link %COMMON_LIBS% dxcompiler.lib /DELAYLOAD:dxcompiler.dll /SUBSYSTEM:CONSOLE /INCREMENTAL /ILK:"Intermediate\x64-!CFG!\JulietShaderCompiler.ilk" /PDB:"Intermediate\x64-!CFG!\JulietShaderCompiler.pdb"
-        if %ERRORLEVEL% neq 0 exit /b %ERRORLEVEL%
+            if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
             echo bin\x64-!CFG!\JulietShaderCompiler.exe>>Intermediate\built_outputs.tmp
         )
+    )
 )
 
 exit /b 0
-

misc/build_helper.ps1

@@ -0,0 +1,163 @@
+# misc/build_helper.ps1 - Unified Build Utility Script
+param(
+    [string]$Action,
+    [string]$CFG,
+    [string]$TargetJuliet = "0",
+    [string]$TargetGame = "0",
+    [string]$TargetRomeo = "0",
+    [string]$TargetShader = "0"
+)
+
+if (-not (Test-Path "Intermediate")) {
+    New-Item -ItemType Directory -Path "Intermediate" | Out-Null
+}
+
+switch ($Action) {
+    "StartBuild" {
+        [System.IO.File]::WriteAllText("Intermediate\build_start.tmp", [System.DateTime]::Now.Ticks.ToString())
+    }
+
+    "FinishBuild" {
+        $elapsedStr = "00:00:00.000"
+        if (Test-Path "Intermediate\build_start.tmp") {
+            $startStr = Get-Content "Intermediate\build_start.tmp" -ErrorAction SilentlyContinue
+            if ($startStr) {
+                $startTicks = [long]$startStr
+                $elapsed = New-Object System.TimeSpan ([System.DateTime]::Now.Ticks - $startTicks)
+                $elapsedStr = "{0:D2}:{1:D2}:{2:D2}.{3:D3}" -f $elapsed.Hours, $elapsed.Minutes, $elapsed.Seconds, $elapsed.Milliseconds
+            }
+            Remove-Item "Intermediate\build_start.tmp" -ErrorAction SilentlyContinue
+        }
+        Write-Host "Total Duration : $elapsedStr"
+        Write-Host "Output Binaries:"
+        if (Test-Path "Intermediate\built_outputs.tmp") {
+            $files = Get-Content "Intermediate\built_outputs.tmp" -ErrorAction SilentlyContinue | Where-Object { Test-Path $_ }
+            if ($files) {
+                foreach ($f in $files) {
+                    $item = Get-Item $f
+                    $size = "{0:N2} MB" -f ($item.Length / 1MB)
+                    $relPath = $item.FullName.Replace((Get-Location).Path + "\", "")
+                    Write-Host "  - $relPath ($size)"
+                }
+            } else {
+                Write-Host "  - None built in this session (all requested targets up-to-date)"
+            }
+            Remove-Item "Intermediate\built_outputs.tmp" -ErrorAction SilentlyContinue
+        } else {
+            Write-Host "  - None built in this session (all requested targets up-to-date)"
+        }
+    }
+
+    "StartUnity" {
+        # Compute SHA256 hashes of all existing Unity files before FASTBuild runs
+        $hashes = @{}
+        Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue | ForEach-Object {
+            $hash = (Get-FileHash -Path $_.FullName -Algorithm SHA256).Hash
+            $hashes[$_.FullName] = $hash
+        }
+        $hashes | ConvertTo-Json | Set-Content -Path "Intermediate\unity_hashes.tmp" -ErrorAction SilentlyContinue
+    }
+
+    "EvaluateConfig" {
+        # 1. Strip '#pragma message' from generated Unity files if present
+        Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue | ForEach-Object {
+            $filePath = $_.FullName
+            $lines = [System.IO.File]::ReadAllLines($filePath)
+            $filtered = $lines | Where-Object { $_ -notlike '*#pragma message*' }
+            if ($lines.Count -ne $filtered.Count) {
+                [System.IO.File]::WriteAllLines($filePath, $filtered)
+            }
+        }
+
+        # 2. Compare Unity hashes to detect Unity structure changes
+        $oldHashes = @{}
+        if (Test-Path "Intermediate\unity_hashes.tmp") {
+            try {
+                $json = Get-Content "Intermediate\unity_hashes.tmp" -Raw -ErrorAction SilentlyContinue
+                if ($json) {
+                    $obj = $json | ConvertFrom-Json
+                    foreach ($prop in $obj.PSObject.Properties) {
+                        $oldHashes[$prop.Name] = $prop.Value
+                    }
+                }
+            } catch {}
+            Remove-Item "Intermediate\unity_hashes.tmp" -ErrorAction SilentlyContinue
+        }
+
+        $unityChanged = "0"
+        $currentFiles = Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue
+        if (-not $currentFiles) {
+            $unityChanged = "1"
+        } else {
+            foreach ($file in $currentFiles) {
+                $path = $file.FullName
+                $newHash = (Get-FileHash -Path $path -Algorithm SHA256).Hash
+                if (-not $oldHashes.ContainsKey($path) -or $oldHashes[$path] -ne $newHash) {
+                    $unityChanged = "1"
+                    break
+                }
+            }
+        }
+
+        # Helper function to check if target binary/obj is missing or older than source files in dirs
+        function Test-NeedRebuild([string]$targetFile, [string[]]$dirs) {
+            if (-not (Test-Path $targetFile)) { return "1" }
+            if ($unityChanged -eq "1") { return "1" }
+            $targetTime = (Get-Item $targetFile).LastWriteTime
+            foreach ($d in $dirs) {
+                if (Test-Path $d) {
+                    $newer = Get-ChildItem -Path $d -Recurse -File -ErrorAction SilentlyContinue | Where-Object {
+                        ($_.Extension -eq '.cpp' -or $_.Extension -eq '.h' -or $_.Extension -eq '.hpp' -or $_.Extension -eq '.inl') -and $_.LastWriteTime -gt $targetTime
+                    }
+                    if ($newer) { return "1" }
+                }
+            }
+            return "0"
+        }
+
+        $julietObj = "Intermediate\x64-$CFG\Juliet_Unity1.obj"
+        $imguiObj  = "Intermediate\x64-$CFG\ImGui_Unity1.obj"
+        $gameDll   = "bin\x64-$CFG\Game.dll"
+        $julietApp = "bin\x64-$CFG\JulietApp.exe"
+        $romeoExe  = "bin\x64-$CFG\Romeo.exe"
+        $shaderExe = "bin\x64-$CFG\JulietShaderCompiler.exe"
+
+        $julietNeed = Test-NeedRebuild $julietObj @("Juliet")
+        $imguiNeed  = Test-NeedRebuild $imguiObj  @("External/imgui")
+
+        $gameNeed = "0"
+        if ($TargetJuliet -eq "1" -or $TargetGame -eq "1") {
+            $gameNeed = Test-NeedRebuild $gameDll @("Juliet", "Game", "External/imgui")
+            if ($julietNeed -eq "1") { $gameNeed = "1" }
+        }
+
+        $julietAppNeed = "0"
+        if ($TargetJuliet -eq "1") {
+            $julietAppNeed = Test-NeedRebuild $julietApp @("JulietApp", "Game", "Juliet", "External/imgui")
+            if ($gameNeed -eq "1") { $julietAppNeed = "1" }
+        }
+
+        $romeoNeed = "0"
+        if ($TargetRomeo -eq "1") {
+            $romeoNeed = Test-NeedRebuild $romeoExe @("Romeo", "Juliet", "External/imgui")
+            if ($julietNeed -eq "1") { $romeoNeed = "1" }
+        }
+
+        $shaderNeed = "0"
+        if ($TargetShader -eq "1" -and (Test-Path "Intermediate\JulietShaderCompiler\*.cpp")) {
+            $shaderNeed = Test-NeedRebuild $shaderExe @("JulietShaderCompiler", "Juliet", "External/imgui")
+            if ($julietNeed -eq "1") { $shaderNeed = "1" }
+        }
+
+        $lines = @(
+            "FASTBUILD_UNITY_CHANGED=$unityChanged",
+            "JULIET_NEED_COMPILE=$julietNeed",
+            "IMGUI_NEED_COMPILE=$imguiNeed",
+            "GAME_NEED_COMPILE=$gameNeed",
+            "JULIETAPP_NEED_COMPILE=$julietAppNeed",
+            "ROMEO_NEED_COMPILE=$romeoNeed",
+            "SHADER_NEED_COMPILE=$shaderNeed"
+        )
+        $lines | Set-Content -Path "Intermediate\config_status.tmp"
+    }
+}

misc/check_target.ps1

@@ -0,0 +1,29 @@
+# check_target.ps1 - Checks if target binary needs to be rebuilt based on binary existence and source file modification times
+param(
+    [string]$TargetBinary,
+    [string]$SearchDirs
+)
+
+if (-not (Test-Path $TargetBinary)) {
+    Set-Content -Path "Intermediate\need_build.tmp" -Value "1"
+    exit 0
+}
+
+$binTime = (Get-Item $TargetBinary).LastWriteTime
+$dirs = $SearchDirs -split ','
+
+$needsRebuild = "0"
+foreach ($dir in $dirs) {
+    if (Test-Path $dir) {
+        # Check source .cpp, .h, .hpp, .inl files for changes newer than target binary
+        $newer = Get-ChildItem -Path $dir -Recurse -File -ErrorAction SilentlyContinue | Where-Object { 
+            ($_.Extension -eq '.cpp' -or $_.Extension -eq '.h' -or $_.Extension -eq '.hpp' -or $_.Extension -eq '.inl') -and $_.LastWriteTime -gt $binTime 
+        }
+        if ($newer) {
+            $needsRebuild = "1"
+            break
+        }
+    }
+}
+
+Set-Content -Path "Intermediate\need_build.tmp" -Value $needsRebuild

misc/clean_unity.ps1

@@ -0,0 +1,61 @@
+# clean_unity.ps1 - Manages Unity files content hashing and change detection
+param(
+    [string]$Action = "Finish"
+)
+
+if (-not (Test-Path "Intermediate")) { New-Item -ItemType Directory -Path "Intermediate" | Out-Null }
+
+$hashFile = "Intermediate\unity_hashes.tmp"
+
+if ($Action -eq "Start") {
+    # Compute SHA256 hashes of all existing Unity files before FASTBuild runs
+    $hashes = @{}
+    Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue | ForEach-Object {
+        $hash = (Get-FileHash -Path $_.FullName -Algorithm SHA256).Hash
+        $hashes[$_.FullName] = $hash
+    }
+    $hashes | ConvertTo-Json | Set-Content -Path $hashFile -ErrorAction SilentlyContinue
+}
+elseif ($Action -eq "Finish") {
+    $oldHashes = @{}
+    if (Test-Path $hashFile) {
+        try {
+            $json = Get-Content $hashFile -Raw -ErrorAction SilentlyContinue
+            if ($json) {
+                $obj = $json | ConvertFrom-Json
+                foreach ($prop in $obj.PSObject.Properties) {
+                    $oldHashes[$prop.Name] = $prop.Value
+                }
+            }
+        } catch {}
+        Remove-Item $hashFile -ErrorAction SilentlyContinue
+    }
+
+    # Clean '#pragma message' from generated Unity files if present
+    Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue | ForEach-Object {
+        $filePath = $_.FullName
+        $lines = [System.IO.File]::ReadAllLines($filePath)
+        $filtered = $lines | Where-Object { $_ -notlike '*#pragma message*' }
+        if ($lines.Count -ne $filtered.Count) {
+            [System.IO.File]::WriteAllLines($filePath, $filtered)
+        }
+    }
+
+    # Detect if any Unity file is new or has changed content
+    $unityChanged = "0"
+    $currentFiles = Get-ChildItem -Path "Intermediate" -Recurse -Filter "*_Unity*.cpp" -ErrorAction SilentlyContinue
+    if (-not $currentFiles) {
+        $unityChanged = "1"
+    } else {
+        foreach ($file in $currentFiles) {
+            $path = $file.FullName
+            $newHash = (Get-FileHash -Path $path -Algorithm SHA256).Hash
+            if (-not $oldHashes.ContainsKey($path) -or $oldHashes[$path] -ne $newHash) {
+                $unityChanged = "1"
+                break
+            }
+        }
+    }
+
+    Set-Content -Path "Intermediate\unity_changed.tmp" -Value $unityChanged
+}

misc/summary_helper.ps1

@@ -0,0 +1,39 @@
+# summary_helper.ps1 - Handles build timing and summary reporting cleanly
+param(
+    [string]$Action
+)
+
+if ($Action -eq "Start") {
+    if (-not (Test-Path "Intermediate")) { New-Item -ItemType Directory -Path "Intermediate" | Out-Null }
+    [System.IO.File]::WriteAllText("Intermediate\build_start.tmp", [System.DateTime]::Now.Ticks.ToString())
+}
+elseif ($Action -eq "Finish") {
+    $elapsedStr = "00:00:00.000"
+    if (Test-Path "Intermediate\build_start.tmp") {
+        $startStr = Get-Content "Intermediate\build_start.tmp" -ErrorAction SilentlyContinue
+        if ($startStr) {
+            $startTicks = [long]$startStr
+            $elapsed = New-Object System.TimeSpan ([System.DateTime]::Now.Ticks - $startTicks)
+            $elapsedStr = "{0:D2}:{1:D2}:{2:D2}.{3:D3}" -f $elapsed.Hours, $elapsed.Minutes, $elapsed.Seconds, $elapsed.Milliseconds
+        }
+        Remove-Item "Intermediate\build_start.tmp" -ErrorAction SilentlyContinue
+    }
+    Write-Host "Total Duration : $elapsedStr"
+    Write-Host "Output Binaries:"
+    if (Test-Path "Intermediate\built_outputs.tmp") {
+        $files = Get-Content "Intermediate\built_outputs.tmp" -ErrorAction SilentlyContinue | Where-Object { Test-Path $_ }
+        if ($files) {
+            foreach ($f in $files) {
+                $item = Get-Item $f
+                $size = "{0:N2} MB" -f ($item.Length / 1MB)
+                $relPath = $item.FullName.Replace((Get-Location).Path + "\", "")
+                Write-Host "  - $relPath ($size)"
+            }
+        } else {
+            Write-Host "  - None built in this session (all requested targets up-to-date)"
+        }
+        Remove-Item "Intermediate\built_outputs.tmp" -ErrorAction SilentlyContinue
+    } else {
+        Write-Host "  - None built in this session (all requested targets up-to-date)"
+    }
+}