basic incremental build

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