Install googletest (#1461)

Also add FindGMock to Find gmock after installation

5 files changed, 59 insertions, 28 deletions

diff --git a/Firestore/CMakeLists.txt b/Firestore/CMakeLists.txt
index 8b6f9d5..1240a8d 100644
--- a/Firestore/CMakeLists.txt
+++ b/Firestore/CMakeLists.txt
@@ -77,23 +77,8 @@ set(FIREBASE_BINARY_DIR ${PROJECT_BINARY_DIR}/..)
 list(INSERT CMAKE_MODULE_PATH 0 ${FIREBASE_SOURCE_DIR}/cmake)
 include(utils)
 
-# Include GoogleTest directly in the build.
-set(gtest_dir ${FIREBASE_BINARY_DIR}/external/googletest)
-add_subdirectory(
-  ${gtest_dir}/src/googletest
-  ${gtest_dir}/src/googletest-build
-  EXCLUDE_FROM_ALL
-)
-
-# Set up aliases with the same names as available via FindGTest.
-add_library(
-  GTest::GTest ALIAS gtest
-)
-
-add_library(
-  GTest::Main ALIAS gtest_main
-)
-
+find_package(GTest REQUIRED)
+find_package(GMock REQUIRED)
 find_package(LevelDB REQUIRED)
 find_package(GRPC REQUIRED)
 find_package(Nanopb REQUIRED)
diff --git a/Firestore/core/test/firebase/firestore/util/CMakeLists.txt b/Firestore/core/test/firebase/firestore/util/CMakeLists.txt
index 0345f7c..45245ff 100644
--- a/Firestore/core/test/firebase/firestore/util/CMakeLists.txt
+++ b/Firestore/core/test/firebase/firestore/util/CMakeLists.txt
@@ -137,7 +137,7 @@ cc_test(
     absl_base
     absl_strings
     firebase_firestore_util
-    gmock
+    GMock::GMock
 )
 
 if(APPLE)
diff --git a/Firestore/third_party/abseil-cpp/CMakeLists.txt b/Firestore/third_party/abseil-cpp/CMakeLists.txt
index 7318cd3..4b939fa 100644
--- a/Firestore/third_party/abseil-cpp/CMakeLists.txt
+++ b/Firestore/third_party/abseil-cpp/CMakeLists.txt
@@ -76,14 +76,14 @@ endif()
 
 ## check targets
 if(BUILD_TESTING)
-  check_target(gtest)
-  check_target(gtest_main)
-  check_target(gmock)
+  check_target(GTest::GTest)
+  check_target(GTest::Main)
+  check_target(GMock::GMock)
 
   list(APPEND ABSL_TEST_COMMON_LIBRARIES
-    gtest_main
-    gtest
-    gmock
+    GTest::GTest
+    GTest::Main
+    GMock::GMock
     ${CMAKE_THREAD_LIBS_INIT}
   )
 endif()
diff --git a/cmake/FindGMock.cmake b/cmake/FindGMock.cmake
new file mode 100644
index 0000000..76ce227
--- /dev/null
+++ b/cmake/FindGMock.cmake
@@ -0,0 +1,47 @@
+# Copyright 2018 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.
+
+include(FindPackageHandleStandardArgs)
+
+find_path(
+  GMOCK_INCLUDE_DIR gmock/gmock.h
+  HINTS ${FIREBASE_INSTALL_DIR}/include
+)
+
+find_library(
+  GMOCK_LIBRARY
+  NAMES gmock
+  HINTS ${FIREBASE_INSTALL_DIR}/lib
+)
+
+find_package_handle_standard_args(
+  gmock
+  DEFAULT_MSG
+  GMOCK_INCLUDE_DIR
+  GMOCK_LIBRARY
+)
+
+if(GMOCK_FOUND)
+  set(GMOCK_INCLUDE_DIRS ${GMOCK_INCLUDE_DIR})
+  set(GMOCK_LIBRARIES ${GMOCK_LIBRARY})
+
+  if (NOT TARGET GMock::GMock)
+    add_library(GMock::GMock UNKNOWN IMPORTED)
+    set_target_properties(
+      GMock::GMock PROPERTIES
+      INTERFACE_INCLUDE_DIRECTORIES ${GMOCK_INCLUDE_DIRS}
+      IMPORTED_LOCATION ${GMOCK_LIBRARY}
+    )
+  endif()
+endif(GMOCK_FOUND)
diff --git a/cmake/external/googletest.cmake b/cmake/external/googletest.cmake
index f48c357..3af136e 100644
--- a/cmake/external/googletest.cmake
+++ b/cmake/external/googletest.cmake
@@ -24,10 +24,9 @@ ExternalProject_Add(
 
   PREFIX ${PROJECT_BINARY_DIR}/external/googletest
 
-  # Just download the sources without building.
+  CMAKE_CACHE_ARGS
+    -DCMAKE_INSTALL_PREFIX:STRING=${FIREBASE_INSTALL_DIR}
+
   UPDATE_COMMAND ""
-  CONFIGURE_COMMAND ""
-  BUILD_COMMAND ""
-  INSTALL_COMMAND ""
   TEST_COMMAND ""
 )