added automatic clobber when nesessary

spitfire/build.go

@@ -92,8 +92,22 @@ func CleanBuild(sourcePath string, fullClean bool) {
 		errors = append(errors, "Failed to revert changes in Mozilla repository.")
 	}
 
-	if fullClean {
+	// Paths for CLOBBER file and last build timestamp
-		// Perform full clean if specified
+	clobberFile := filepath.Join(sourcePath, "obj-x86_64-pc-windows-msvc", "CLOBBER")
+	buildTimestampFile := filepath.Join(sourcePath, "obj-x86_64-pc-windows-msvc", ".last_build_timestamp")
+
+	// Check if a clobber is required
+	clobberRequired := false
+	if _, err := os.Stat(clobberFile); err == nil {
+		clobberFileInfo, _ := os.Stat(clobberFile)
+		if buildInfo, err := os.Stat(buildTimestampFile); err != nil || clobberFileInfo.ModTime().After(buildInfo.ModTime()) {
+			clobberRequired = true
+			fmt.Println("CLOBBER file has been updated. Clobber is required.")
+		}
+	}
+
+	if fullClean || clobberRequired {
+		// Perform full clean or clobber if necessary
 		var machCmd string
 		if runtime.GOOS == "windows" {
 			machCmd = ".\\mach"
@@ -103,6 +117,8 @@ func CleanBuild(sourcePath string, fullClean bool) {
 
 		if err := runCommand(machCmd, "clobber"); err != nil {
 			errors = append(errors, "Failed to clean build.")
+		} else {
+			fmt.Println("Build artifacts cleaned successfully.")
 		}
 	} else {
 		fmt.Println("Skipping full clean. Build artifacts remain intact.")