Fix argument length error for WriteSwiftDebugSettings

tools/generators/swift_debug_settings/src/SwiftDebugSettings.swift

@@ -1,4 +1,5 @@
 import Darwin
+import Foundation
 import ToolCommon
 
 @main
@@ -12,16 +13,32 @@ struct SwiftDebugSettings {
 
         do {
             // First argument is executable name
-            var rawArguments = CommandLine.arguments.dropFirst()
+            let rawArguments = CommandLine.arguments.dropFirst()
+
+            // Check for a params file
+            var arguments: ArraySlice<String>
+            if let arg = rawArguments.first, rawArguments.count == 1,
+               arg.starts(with: "@")
+            {
+                arguments = try await parseParamsFile(String(arg.dropFirst()))
+            } else {
+                arguments = ArraySlice(rawArguments)
+            }
 
-            if try rawArguments.consumeArg("colorize", as: Bool.self) {
+            if try arguments.consumeArg("colorize", as: Bool.self) {
                 logger.enableColors()
             }
 
-            try await Generator().generate(rawArguments: rawArguments)
+            try await Generator().generate(rawArguments: arguments)
         } catch {
             logger.logError(error.localizedDescription)
             Darwin.exit(1)
         }
     }
+
+    private static func parseParamsFile(
+        _ path: String
+    ) async throws -> ArraySlice<String> {
+        return try await ArraySlice(URL(fileURLWithPath: path).allLines.collect())
+    }
 }

xcodeproj/internal/pbxproj_partials.bzl

@@ -1049,6 +1049,8 @@ def _write_swift_debug_settings(
     )
 
     args = actions.args()
+    args.use_param_file("@%s")
+    args.set_param_file_format(format = "multiline")
 
     # colorize
     args.add(TRUE_ARG if colorize else FALSE_ARG)