Update GoogleTest to latest version

CMakeLists.txt

@@ -15,16 +15,16 @@ set(GZ_CMAKE_VER ${gz-cmake3_VERSION_MAJOR})
 #============================================================================
 # Configure the project
 #============================================================================
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
 gz_configure_project(
   REPLACE_IGNITION_INCLUDE_PATH gz/common
   VERSION_SUFFIX pre1)
 
 #============================================================================
 # Set project-specific options
 #============================================================================
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
 #--------------------------------------
 # Option: Should Windows test symlinking?
 if(WIN32)

src/CMakeLists.txt

@@ -4,8 +4,7 @@ gz_get_libsources_and_unittests(sources gtest_sources)
 
 # Create the library target
 gz_create_core_library(
-  SOURCES ${sources}
-  CXX_STANDARD 17)
+  SOURCES ${sources})
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL GNU)
     set(CXX_FILESYSTEM_LIBRARIES stdc++fs)

test/CMakeLists.txt

@@ -1,17 +1,4 @@
-include_directories(
-  ${PROJECT_SOURCE_DIR}/test/gtest/include
-  ${PROJECT_SOURCE_DIR}/test/gtest
-  ${PROJECT_SOURCE_DIR}/test
-)
-
-# Build gtest
-add_library(gtest STATIC gtest/src/gtest-all.cc)
-add_library(gtest_main STATIC gtest/src/gtest_main.cc)
-
-target_link_libraries(gtest_main gtest)
-set(GTEST_LIBRARY "${PROJECT_BINARY_DIR}/test/libgtest.a")
-set(GTEST_MAIN_LIBRARY "${PROJECT_BINARY_DIR}/test/libgtest_main.a")
-
+add_subdirectory(gtest_vendor)
 add_subdirectory(integration)
 add_subdirectory(performance)
 add_subdirectory(regression)