Handle the C++ SDK being built for Android without doing Gradle first

Add logic that allows CMake to invoke gradle if the dexed jar files are not present already. Defines the proguard files with the same logic, so that the Unity SDK, which needs to access the proguard file, can access it.

Currently the build logic of CMake invoking Gradle causes some parts of the build to be unnecessarily duplicated, and will need to be improved in the future.

PiperOrigin-RevId: 277102239

Author: a-maurice

admob/CMakeLists.txt

@@ -17,7 +17,9 @@
 cmake_minimum_required (VERSION 3.1)
 set (CMAKE_CXX_STANDARD 11)
 
+include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_admob NONE)
 enable_language(C)
@@ -36,6 +38,8 @@ set(common_SRCS
     src/common/rewarded_video_internal.cc)
 
 # Define the resource build needed for Android
+firebase_cpp_gradle(":admob:admob_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/admob_resources/build/dexed.jar")
 binary_to_array("admob_resources"
     "${CMAKE_CURRENT_LIST_DIR}/admob_resources/build/dexed.jar"
     "firebase_admob"
@@ -107,7 +111,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(admob)
+elseif(IOS)
   # AdMob for iOS uses weak references, which requires enabling Automatic
   # Reference Counting (ARC).
   set_property(

analytics/CMakeLists.txt

@@ -18,6 +18,7 @@ cmake_minimum_required (VERSION 3.1)
 set (CMAKE_CXX_STANDARD 11)
 
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_analytics NONE)
 enable_language(C)
@@ -121,7 +122,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(analytics)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_analytics

app/CMakeLists.txt

@@ -20,6 +20,7 @@ set (CMAKE_CXX_STANDARD 11)
 include(FindPkgConfig)
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_app NONE)
 enable_language(C)
@@ -32,14 +33,20 @@ binary_to_array("google_services_resource"
     "${FIREBASE_GEN_FILE_DIR}/app")
 
 # Define the resource builds needed for Android
+firebase_cpp_gradle(":app:app_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/app_resources/build/dexed.jar")
 binary_to_array("app_resources"
     "${CMAKE_CURRENT_LIST_DIR}/app_resources/build/dexed.jar"
     "firebase_app"
     "${FIREBASE_GEN_FILE_DIR}/app")
+firebase_cpp_gradle(":app:google_api_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/google_api_resources/build/dexed.jar")
 binary_to_array("google_api_resources"
     "${CMAKE_CURRENT_LIST_DIR}/google_api_resources/build/dexed.jar"
     "google_api"
     "${FIREBASE_GEN_FILE_DIR}/app")
+firebase_cpp_gradle(":app:invites_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/invites_resources/build/dexed.jar")
 binary_to_array("invites_resources"
     "${CMAKE_CURRENT_LIST_DIR}/invites_resources/build/dexed.jar"
     "firebase_invites"
@@ -340,7 +347,9 @@ if(MSVC)
   add_definitions(-DNOMINMAX)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(app)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_app

auth/CMakeLists.txt

@@ -19,6 +19,7 @@ set (CMAKE_CXX_STANDARD 11)
 
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_auth NONE)
 enable_language(C)
@@ -64,6 +65,8 @@ set(common_SRCS
     src/user.cc)
 
 # Define the resource build needed for Android
+firebase_cpp_gradle(":auth:auth_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/auth_resources/build/dexed.jar")
 binary_to_array("auth_resources"
     "${CMAKE_CURRENT_LIST_DIR}/auth_resources/build/dexed.jar"
     "firebase_auth"
@@ -196,7 +199,9 @@ if(MSVC)
   add_definitions(-DNOMINMAX)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(auth)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_auth

cmake/firebase_cpp_gradle.cmake

@@ -0,0 +1,52 @@
+# Copyright 2019 Google
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# If the expected file does not already exist, defines a custom command to use
+# the Gradle Wrapper in the root directory to invoke the given build rule.
+#
+# Args:
+#   GRADLE_TARGET: The gradle target that will be built, if needed.
+#   EXPECTED_FILE: The expected output from the gradle target.
+function(firebase_cpp_gradle GRADLE_TARGET EXPECTED_FILE)
+  if(NOT EXISTS ${EXPECTED_FILE})
+    if(WIN32)
+      set(gradle_command "gradlew.bat")
+    else()
+      set(gradle_command "./gradlew")
+    endif()
+
+    # Run gradle to generated the expected file
+    add_custom_command(
+      COMMAND ${gradle_command} ${GRADLE_TARGET}
+      OUTPUT ${EXPECTED_FILE}
+      WORKING_DIRECTORY ${FIREBASE_SOURCE_DIR}
+    )
+  endif()
+endfunction()
+
+# Defines a variable for generating the proguard file for a given library.
+# The variable is FIREBASE_CPP_${LIBRARY_NAME}_PROGUARD, all in upper case.
+#
+# Args:
+#   LIBRARY_NAME: The name of the library to define the proguard file for.
+function(firebase_cpp_proguard_file LIBRARY_NAME)
+  string(TOUPPER "${LIBRARY_NAME}" upper_name)
+  set(proguard_var "FIREBASE_CPP_${upper_name}_PROGUARD")
+  set(${proguard_var}
+      "${FIREBASE_SOURCE_DIR}/${LIBRARY_NAME}/build/${LIBRARY_NAME}.pro")
+  set("${proguard_var}" "${${proguard_var}}" PARENT_SCOPE)
+
+  firebase_cpp_gradle(":${LIBRARY_NAME}:externalNativeBuildRelease"
+                      "${${proguard_var}}")
+endfunction()

database/CMakeLists.txt

@@ -19,6 +19,7 @@ set (CMAKE_CXX_STANDARD 11)
 
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_database NONE)
 enable_language(C)
@@ -36,6 +37,8 @@ set(common_SRCS
     src/common/query.cc)
 
 # Define the resource build needed for Android
+firebase_cpp_gradle(":database:database_resources:generateDexJarRelease"
+    "${CMAKE_CURRENT_LIST_DIR}/database_resources/build/dexed.jar")
 binary_to_array("database_resources"
     "${CMAKE_CURRENT_LIST_DIR}/database_resources/build/dexed.jar"
     "firebase_database_resources"
@@ -194,7 +197,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(database)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC)
   set_property(
     TARGET firebase_database

functions/CMakeLists.txt

@@ -19,6 +19,7 @@ set (CMAKE_CXX_STANDARD 11)
 
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_functions NONE)
 enable_language(C)
@@ -97,7 +98,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(functions)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_functions

instance_id/CMakeLists.txt

@@ -19,6 +19,7 @@ set (CMAKE_CXX_STANDARD 11)
 
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_instance_id NONE)
 enable_language(C)
@@ -94,7 +95,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(instance_id)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_instance_id

messaging/CMakeLists.txt

@@ -19,6 +19,7 @@ set (CMAKE_CXX_STANDARD 11)
 
 include(binary_to_array)
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_messaging NONE)
 enable_language(C)
@@ -113,7 +114,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(messaging)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_messaging

remote_config/CMakeLists.txt

@@ -18,6 +18,7 @@ cmake_minimum_required (VERSION 3.1)
 set (CMAKE_CXX_STANDARD 11)
 
 include(download_pod_headers)
+include(firebase_cpp_gradle)
 
 project(firebase_remote_config NONE)
 enable_language(C)
@@ -124,7 +125,9 @@ else()
   add_definitions(-include assert.h -include string.h)
 endif()
 
-if(IOS)
+if(ANDROID)
+  firebase_cpp_proguard_file(remote_config)
+elseif(IOS)
   # Enable Automatic Reference Counting (ARC).
   set_property(
     TARGET firebase_remote_config