SSAST-11722 Log error and continue on TargetDependency decode error

PIF/Sources/PIFSupport/PIF.swift

@@ -378,22 +378,36 @@ public enum PIF {
 
 	/// Represents a dependency on another target (identified by its PIF GUID).
 	public struct TargetDependency: Decodable {
+		/// Name of dependency
+		public let name: String
+
 		/// Identifier of depended-upon target.
-		public let targetGUID: String
+		public let targetGUID: String?
 
 		/// The platform filters for this target dependency.
 		public let platformFilters: [PlatformFilter]
 
 		private enum CodingKeys: CodingKey {
-			case guid, platformFilters
+			case name, guid, platformFilters
 		}
 
 		public init(from decoder: Decoder) throws {
 			let container = try decoder.container(keyedBy: CodingKeys.self)
 
-			targetGUID = try container.decode(String.self, forKey: .guid)
+			name = try container.decodeIfPresent(String.self, forKey: .name) ?? "Unknown"
+			targetGUID = try container.decodeIfPresent(String.self, forKey: .guid)
+
+			if targetGUID == nil {
+				logger.info("          ------------------------------------------------------------------------------------------")
+				logger.info("                    Error: dependency \(name) is missing a guid and will not be resolved!\n")
+				logger.info("                       For more context rerun with --log-level=trace.")
+				logger.info("                       Be aware the this may generate a LOT of output.")
+				logger.info("                    This is an error in your project metadata you may want to report this to Apple.")
+				logger.info("          ------------------------------------------------------------------------------------------")
+			}
+
 			platformFilters = try container.decodeIfPresent([PlatformFilter].self, forKey: .platformFilters) ?? []
-			logger.trace("---> Decoded TargetDependency: \(targetGUID)")
+			logger.trace("---> Decoded TargetDependency: \(name) \(targetGUID ?? "<nil>")")
 		}
 	}
 

Sources/GenIR/PIFCache.swift

@@ -196,11 +196,17 @@ struct PIFDependencyProvider: DependencyProviding {
 
 		let productTargetDependencies = cache.target(guid: product.guid)?
 			.dependencies
-			.filter { $0.targetGUID.starts(with: targetToken) }
+			.compactMap { dependency -> PIF.TargetDependency? in
+				guard let guid = dependency.targetGUID, guid.starts(with: targetToken) else { return nil }
+				return dependency
+			}
 			?? []
 
 		let productUnderlyingTargets = productTargetDependencies
-			.filter { $0.targetGUID.dropFirst(targetToken.count) == productName }
+			.filter { dependency in
+				guard let guid = dependency.targetGUID else { return false }
+				return guid.dropFirst(targetToken.count) == productName
+			}
 
 		if productUnderlyingTargets.isEmpty && !productTargetDependencies.isEmpty {
 			// We likely have a stub target here (i.e. a precompiled framework)
@@ -217,15 +223,20 @@ struct PIFDependencyProvider: DependencyProviding {
 			return productTargetDependencies.first?.targetGUID
 		}
 
-		GenIRLogger.logger.debug("\(packageProductGUID) resolves to \(target.targetGUID)")
-		return target.targetGUID
+		guard let targetGUID = target.targetGUID else {
+			GenIRLogger.logger.debug("\(packageProductGUID) resolves to a target with nil GUID")
+			return nil
+		}
+
+		GenIRLogger.logger.debug("\(packageProductGUID) resolves to \(targetGUID)")
+		return targetGUID
 	}
 
 	func dependencies(for value: Target) -> [Target] {
 		// Direct dependencies
 		let dependencyTargetGUIDs = cache.target(guid: value.guid)?
 			.dependencies
-			.map { $0.targetGUID }
+			.compactMap { $0.targetGUID }
 			.compactMap { resolveSwiftPackage($0) }
 			?? []
 

Sources/GenIR/Versions.swift

@@ -5,7 +5,8 @@
 //  Created by Thomas Hedderwick on 12/09/2022.
 //
 // History:
-// 2025-nn-nn - 1.0.1 -- Use info logging to allow user to monitor progress.
+// 2026-nn-nn - 1.0.2 -- SSAST-11722 don't fail on TargetDependency decode failure.
+// 2026-01-08 - 1.0.1 -- Use info logging to allow user to monitor progress.
 // 2025-12-01 - 1.0.0 -- Don't chase through Dynamic Dependencies
 // 2025-09-19 - 0.5.4 -- Update release doc; warn multiple builds; capture debug data
 // 2025-04-18 - 0.5.3 -- PIF Tracing; log unique compiler commands
@@ -15,5 +16,5 @@
 import Foundation
 
 enum Versions {
-	static let version = "1.0.1"
+	static let version = "1.0.2"
 }