simplify cocoapods

FirebaseCombineSwift.podspec

@@ -59,6 +59,7 @@ for internal testing only. It should not be published.
 
   s.pod_target_xcconfig = {
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"',
+    'SWIFT_OBJC_INTEROP_MODE' => 'objcxx',
   }
 
   s.test_spec 'unit' do |unit_tests|
@@ -81,7 +82,8 @@ for internal testing only. It should not be published.
     unit_tests.exclude_files = 'FirebaseCombineSwift/Tests/Unit/**/*Template.swift'
     unit_tests.requires_app_host = true
     unit_tests.pod_target_xcconfig = {
-      'SWIFT_OBJC_BRIDGING_HEADER' => '$(PODS_TARGET_SRCROOT)/FirebaseCombineSwift/Tests/Unit/FirebaseCombine-unit-Bridging-Header.h'
+      'SWIFT_OBJC_BRIDGING_HEADER' => '$(PODS_TARGET_SRCROOT)/FirebaseCombineSwift/Tests/Unit/FirebaseCombine-unit-Bridging-Header.h',
+      'SWIFT_OBJC_INTEROP_MODE' => 'objcxx',
     }
     unit_tests.dependency 'OCMock'
     unit_tests.dependency 'FirebaseAuthTestingSupport'

FirebaseFirestore.podspec

@@ -44,7 +44,6 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
   s.dependency 'FirebaseCore', '11.5'
   s.dependency 'FirebaseCoreExtension', '11.5'
   s.dependency 'FirebaseFirestoreInternal', '11.5.0'
-  s.dependency 'FirebaseFirestoreCpp', '11.5.0'
   s.dependency 'FirebaseSharedSwift', '~> 11.0'
 
 end

FirebaseFirestoreInternal.podspec

@@ -28,7 +28,10 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
   # Header files that constitute the interface to this module. Only Objective-C
   # headers belong here, since FirebaseFirestore is primarily an Objective-C
   # framework.
-  s.public_header_files = 'Firestore/Source/Public/FirebaseFirestore/*.h'
+  s.public_header_files = [
+    'Firestore/Source/Public/FirebaseFirestore/*.h',
+    'Firestore/core/swift/include/*.h'
+  ]
 
   # source_files contains most of the header and source files for the project.
   # This includes files named in `public_header_files`.
@@ -52,6 +55,7 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
     'Firestore/core/include/**/*.{cc,mm}',
     'Firestore/core/src/**/*.{cc,mm}',
     'FirebaseAuth/Interop/**/*.h',
+    'Firestore/core/swift/**/*.{cc,h}',
   ]
 
   # Internal headers that aren't necessarily globally unique. Most C++ internal

Firestore/Swift/Source/SwiftAPI/SwiftCppAPI.swift

@@ -14,7 +14,9 @@
  * limitations under the License.
  */
 
-import FirebaseFirestoreCpp
+#if SWIFT_PACKAGE
+  @_exported import FirebaseFirestoreCpp
+#endif // SWIFT_PACKAGE
 
 public class SwiftCppWrapper {
   public init(_ value: String) {