Update gtest used to v1.15.2

Author: mcbarton

.github/workflows/ci.yml

@@ -846,7 +846,7 @@ jobs:
                 ../
         fi
         os="${{ matrix.os }}"
-        cmake --build . --target check-cppinterop --parallel ${{ env.ncpus }}
+        cmake --build . --target check-cppinterop --parallel ${{ env.ncpus }} 
         if [[ ("${os}" == "ubuntu"*) ]]; then
           valgrind --show-error-list=yes --track-origins=yes --error-exitcode=1 unittests/CppInterOp/CppInterOpTests
         fi

CMakeLists.txt

@@ -324,7 +324,7 @@ include_directories(BEFORE SYSTEM
   ${CMAKE_CURRENT_SOURCE_DIR}/include
   )
 
-#Removes flag due to issue with Google test download when LLVM_ENABLE_WERROR=On
+#Removes flags due to issue with Google test download when LLVM_ENABLE_WERROR=On
 string(REPLACE "-Wcovered-switch-default" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 
 file(STRINGS "VERSION" CPPINTEROP_VERSION)

cmake/modules/GoogleTest.cmake

@@ -17,14 +17,15 @@ if(WIN32)
     BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG>)
 elseif(APPLE)
   set(EXTRA_GTEST_OPTS -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT})
+  string(REPLACE "-Wc++17-attribute-extensions" "" CMAKE_CXX_FLAGS "${CMAKE_Cxx_FLAGS}")
 endif()
 
 include(ExternalProject)
 ExternalProject_Add(
   googletest
   GIT_REPOSITORY https://github.com/google/googletest.git
   GIT_SHALLOW 1
-  GIT_TAG release-1.12.1
+  GIT_TAG v1.15.2
   UPDATE_COMMAND ""
   # # Force separate output paths for debug and release builds to allow easy
   # # identification of correct lib in subsequent TARGET_LINK_LIBRARIES commands