[Infra] Bump swift-tools-version in Package.swift

FirebaseCore/CHANGELOG.md

@@ -29,6 +29,8 @@
   To start using the new SDK, import the `FirebaseAI` module and use the
   top-level `FirebaseAI` class. See details in the [migration guide
   ](https://firebase.google.com/docs/ai-logic/migrate-to-latest-sdk).
+- [changed] **Breaking change** The Firebase Swift package now requires the
+  Swift 6.0 toolchain (Xcode 16.2+).
 
 # Firebase 11.15.0
 - [fixed] Remove c99 as the required C language standard. (#14950)

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version:5.9
+// swift-tools-version:6.0
 // The swift-tools-version declares the minimum version of Swift required to
 // build this package.
 
@@ -16,7 +16,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import class Foundation.ProcessInfo
 import PackageDescription
 
 let firebaseVersion = "12.0.0"
@@ -521,7 +520,9 @@ let package = Package(
         "ObjC", "Public",
       ],
       resources: [.process("Resources/PrivacyInfo.xcprivacy")],
-      swiftSettings: Context.environment["FIREBASE_CI"] != nil ? [.define("FIREBASE_CI")] : [],
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ],
       linkerSettings: [
         .linkedFramework("Security"),
         .linkedFramework("SafariServices", .when(platforms: [.iOS])),
@@ -572,7 +573,10 @@ let package = Package(
     .target(
       name: "FirebaseAuthCombineSwift",
       dependencies: ["FirebaseAuth"],
-      path: "FirebaseCombineSwift/Sources/Auth"
+      path: "FirebaseCombineSwift/Sources/Auth",
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ]
     ),
     .target(
       name: "FirebaseFirestoreCombineSwift",
@@ -799,7 +803,10 @@ let package = Package(
     .target(
       name: "FirebaseFunctionsCombineSwift",
       dependencies: ["FirebaseFunctions"],
-      path: "FirebaseCombineSwift/Sources/Functions"
+      path: "FirebaseCombineSwift/Sources/Functions",
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ]
     ),
     .testTarget(
       name: "FunctionsCombineUnit",
@@ -852,7 +859,10 @@ let package = Package(
     .target(
       name: "FirebaseInAppMessaging",
       dependencies: ["FirebaseInAppMessagingInternal"],
-      path: "FirebaseInAppMessaging/Swift/Source"
+      path: "FirebaseInAppMessaging/Swift/Source",
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ]
     ),
 
     .target(
@@ -890,6 +900,9 @@ let package = Package(
       ],
       cSettings: [
         .define("FIRMLModelDownloader_VERSION", to: firebaseVersion),
+      ],
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
       ]
     ),
     .testTarget(
@@ -1074,7 +1087,10 @@ let package = Package(
         "FirebaseSharedSwift",
       ],
       path: "FirebaseRemoteConfig/Swift",
-      resources: [.process("Resources/PrivacyInfo.xcprivacy")]
+      resources: [.process("Resources/PrivacyInfo.xcprivacy")],
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ]
     ),
     .testTarget(
       name: "RemoteConfigFakeConsole",
@@ -1198,7 +1214,10 @@ let package = Package(
         .product(name: "GTMSessionFetcherCore", package: "gtm-session-fetcher"),
         .product(name: "GULEnvironment", package: "GoogleUtilities"),
       ],
-      path: "FirebaseStorage/Sources"
+      path: "FirebaseStorage/Sources",
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ]
     ),
     .testTarget(
       name: "FirebaseStorageUnit",
@@ -1386,7 +1405,7 @@ func googleAppMeasurementDependency() -> Package.Dependency {
 
   // Point SPM CI to the tip of main of https://github.com/google/GoogleAppMeasurement so that the
   // release process can defer publishing the GoogleAppMeasurement tag until after testing.
-  if ProcessInfo.processInfo.environment["FIREBASECI_USE_LATEST_GOOGLEAPPMEASUREMENT"] != nil {
+  if Context.environment["FIREBASECI_USE_LATEST_GOOGLEAPPMEASUREMENT"] != nil {
     return .package(url: appMeasurementURL, branch: "main")
   }
 
@@ -1398,7 +1417,7 @@ func abseilDependency() -> Package.Dependency {
 
   // If building Firestore from source, abseil will need to be built as source
   // as the headers in the binary version of abseil are unusable.
-  if ProcessInfo.processInfo.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
+  if Context.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
     packageInfo = (
       "https://github.com/firebase/abseil-cpp-SwiftPM.git",
       "0.20240722.0" ..< "0.20240723.0"
@@ -1418,7 +1437,7 @@ func grpcDependency() -> Package.Dependency {
 
   // If building Firestore from source, abseil will need to be built as source
   // as the headers in the binary version of abseil are unusable.
-  if ProcessInfo.processInfo.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
+  if Context.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
     packageInfo = ("https://github.com/grpc/grpc-ios.git", "1.69.0" ..< "1.70.0")
   } else {
     packageInfo = ("https://github.com/google/grpc-binary.git", "1.69.0" ..< "1.70.0")
@@ -1428,7 +1447,7 @@ func grpcDependency() -> Package.Dependency {
 }
 
 func firestoreWrapperTarget() -> Target {
-  if ProcessInfo.processInfo.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
+  if Context.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
     return .target(
       name: "FirebaseFirestoreTarget",
       dependencies: [.target(name: "FirebaseFirestore",
@@ -1447,7 +1466,7 @@ func firestoreWrapperTarget() -> Target {
 }
 
 func firestoreTargets() -> [Target] {
-  if ProcessInfo.processInfo.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
+  if Context.environment["FIREBASE_SOURCE_FIRESTORE"] != nil {
     return [
       .target(
         name: "FirebaseFirestoreInternalWrapper",
@@ -1543,13 +1562,16 @@ func firestoreTargets() -> [Target] {
         sources: [
           "Swift/Source/",
         ],
-        resources: [.process("Source/Resources/PrivacyInfo.xcprivacy")]
+        resources: [.process("Source/Resources/PrivacyInfo.xcprivacy")],
+        swiftSettings: [
+          .swiftLanguageMode(SwiftLanguageMode.v5),
+        ]
       ),
     ]
   }
 
   let firestoreInternalTarget: Target = {
-    if ProcessInfo.processInfo.environment["FIREBASECI_USE_LOCAL_FIRESTORE_ZIP"] != nil {
+    if Context.environment["FIREBASECI_USE_LOCAL_FIRESTORE_ZIP"] != nil {
       // This is set when running `scripts/check_firestore_symbols.sh`.
       return .binaryTarget(
         name: "FirebaseFirestoreInternal",
@@ -1592,6 +1614,9 @@ func firestoreTargets() -> [Target] {
       ],
       path: "Firestore/Swift/Source",
       resources: [.process("Resources/PrivacyInfo.xcprivacy")],
+      swiftSettings: [
+        .swiftLanguageMode(SwiftLanguageMode.v5),
+      ],
       linkerSettings: [
         .linkedFramework("SystemConfiguration", .when(platforms: [.iOS, .macOS, .tvOS])),
         .linkedFramework("UIKit", .when(platforms: [.iOS, .tvOS])),