[Infra] Move 'core' workflow to Xcode 16 (#14688)

Author: ncooke3

.github/workflows/core.yml

@@ -25,7 +25,7 @@ jobs:
         target: [ios, tvos, macos --skip-tests, watchos]
         build-env:
           - os: macos-14
-            xcode: Xcode_15.2
+            xcode: Xcode_16.2
           - os: macos-15
             xcode: Xcode_16.2
     runs-on: ${{ matrix.build-env.os }}
@@ -47,6 +47,8 @@ jobs:
       cache_key: ${{ steps.generate_cache_key.outputs.cache_key }}
     steps:
       - uses: actions/checkout@v4
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
       - name: Generate Swift Package.resolved
         id: swift_package_resolve
         run: |
@@ -69,11 +71,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-13
-            xcode: Xcode_15.2
-            target: iOS
           - os: macos-14
-            xcode: Xcode_15.4
+            xcode: Xcode_16.2
             target: iOS
           - os: macos-15
             xcode: Xcode_16.2
@@ -132,7 +131,7 @@ jobs:
     # Don't run on private repo.
     if: github.event_name == 'schedule' && github.repository == 'Firebase/firebase-ios-sdk'
 
-    runs-on: macos-13
+    runs-on: macos-14
     strategy:
       matrix:
         target: [ios, tvos, macos]
@@ -143,6 +142,8 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: PodLibLint Core Cron

.github/workflows/core_extension.yml

@@ -23,7 +23,7 @@ jobs:
         target: [ios, tvos, macos, watchos]
         build-env:
           - os: macos-14
-            xcode: Xcode_15.2
+            xcode: Xcode_16.2
           - os: macos-15
             xcode: Xcode_16.2
     runs-on: ${{ matrix.build-env.os }}
@@ -51,6 +51,8 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: PodLibLint CoreInternal Cron

.github/workflows/core_internal.yml

@@ -21,7 +21,7 @@ jobs:
         target: [ios, tvos, macos, watchos]
         build-env:
           - os: macos-14
-            xcode: Xcode_15.2
+            xcode: Xcode_16.2
             swift_version: 5.9
           - os: macos-15
             xcode: Xcode_16.2
@@ -50,6 +50,8 @@ jobs:
       cache_key: ${{ steps.generate_cache_key.outputs.cache_key }}
     steps:
       - uses: actions/checkout@v4
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
       - name: Generate Swift Package.resolved
         id: swift_package_resolve
         run: |
@@ -72,11 +74,8 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-13
-            xcode: Xcode_15.2
-            target: iOS
           - os: macos-14
-            xcode: Xcode_15.4
+            xcode: Xcode_16.2
             target: iOS
           - os: macos-15
             xcode: Xcode_16.2
@@ -135,7 +134,7 @@ jobs:
   core-internal-cron-only:
     # Don't run on private repo.
     if: github.event_name == 'schedule' && github.repository == 'Firebase/firebase-ios-sdk'
-    runs-on: macos-14
+    runs-on: macos-15
     strategy:
       matrix:
         target: [ios, tvos, macos]
@@ -146,6 +145,8 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: PodLibLint CoreInternal Cron

FirebaseCore/Internal/Sources/HeartbeatLogging/HeartbeatsPayload.swift

@@ -15,9 +15,9 @@
 import Foundation
 
 #if SWIFT_PACKAGE
-  @_implementationOnly import GoogleUtilities_NSData
+  internal import GoogleUtilities_NSData
 #else
-  @_implementationOnly import GoogleUtilities
+  internal import GoogleUtilities
 #endif // SWIFT_PACKAGE
 
 /// A type that provides a string representation for use in an HTTP header.