Fix OAuth sign-in not disabling tvOS correctly

Author: a-maurice

auth/src/ios/credential_ios.mm

@@ -445,6 +445,7 @@ explicit PhoneAuthProviderData(FIRPhoneAuthProvider* objc_provider)
   assert(auth_data);
   ReferenceCountedFutureImpl& futures = auth_data->future_impl;
   const auto handle = futures.SafeAlloc<AuthResult>(kAuthFn_SignInWithProvider, AuthResult());
+#if FIREBASE_PLATFORM_IOS
   FIROAuthProvider* ios_provider = (FIROAuthProvider*)[FIROAuthProvider
       providerWithProviderID:@(provider_data_.provider_id.c_str())
                         auth:AuthImpl(auth_data)];
@@ -465,6 +466,12 @@ explicit PhoneAuthProviderData(FIRPhoneAuthProvider* objc_provider)
                                AuthResult());
     return future;
   }
+
+#else   // non-iOS Apple platforms (eg: tvOS)
+  Future<AuthResult> future = MakeFuture(&futures, handle);
+  futures.Complete(handle, kAuthErrorApiNotAvailable,
+                   "OAuth provider sign-in is not supported on non-iOS Apple platforms.");
+#endif  // FIREBASE_PLATFORM_IOS
 }
 
 Future<AuthResult> FederatedOAuthProvider::Link(AuthData* auth_data) {

cmake/toolchains/apple.toolchain.cmake

@@ -257,7 +257,7 @@ if(NOT DEFINED DEPLOYMENT_TARGET)
     set(DEPLOYMENT_TARGET "13.0")
   else()
     # Unless specified, SDK version 11.0 is used by default as minimum target version (iOS, tvOS).
-    set(DEPLOYMENT_TARGET "11.0")
+    set(DEPLOYMENT_TARGET "13.0")
   endif()
   message(STATUS "[DEFAULTS] Using the default min-version since DEPLOYMENT_TARGET not provided!")
 elseif(DEFINED DEPLOYMENT_TARGET AND PLATFORM STREQUAL "MAC_CATALYST" AND ${DEPLOYMENT_TARGET} VERSION_LESS "13.0")