Include the whole ModuleDependenciesContext in the signature

Author: bob-wilson

Sources/SWBCore/Dependencies.swift

@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+import Foundation
 public import SWBUtil
 import SWBMacro
 
@@ -231,8 +232,7 @@ public struct ModuleDependenciesContext: Sendable, SerializableCodable {
         }
     }
 
-    func signatureData() -> String {
-        let moduleNames = moduleDependencies.map { $0.name }
-        return "validate:\(validate),modules:\(moduleNames.joined(separator: ":"))"
+    func jsonData() throws -> Data {
+        try JSONEncoder(outputFormatting: [.prettyPrinted, .sortedKeys, .withoutEscapingSlashes]).encode(self)
     }
 }

Sources/SWBCore/SpecImplementations/Tools/CCompiler.swift

@@ -1343,8 +1343,9 @@ public class ClangCompilerSpec : CompilerSpec, SpecIdentifierType, GCCCompatible
             extraInputs = []
         }
 
-        if let moduleDependenciesContext {
-            additionalSignatureData += moduleDependenciesContext.signatureData()
+        if let moduleDependenciesContext,
+           let signature = try? String(data: moduleDependenciesContext.jsonData(), encoding: .utf8) {
+            additionalSignatureData += "|\(signature)"
         }
 
         // Finally, create the task.