Try fix

Author: mcbarton

cmake/modules/GoogleTest.cmake

@@ -16,13 +16,13 @@ if(WIN32)
     -Dgtest_force_shared_crt=ON
     BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG>)
 elseif(APPLE)
-  #FIXME: Temporarily remove -Wall from CMAKE_CXX_FLAGS to avoid issues with building
+  #FIXME: Temporarily remove -pedantic from CMAKE_CXX_FLAGS to avoid issues with building
   #       latest version of gtest on MacOS (use of -Wc++17-attribute-extensions causes 
   #       issues due to [[maybe_unused]] in gtest)
   set(EXTRA_GTEST_OPTS -DCMAKE_OSX_SYSROOT=${CMAKE_OSX_SYSROOT})
   message(STATUS "CMAKE_CXX_FLAGS= ${CMAKE_CXX_FLAGS}")
   set(CMAKE_CXX_FLAGS_TEMP_COPY ${CMAKE_CXX_FLAGS})
-  string(REPLACE "-Wall" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  string(REPLACE "-pedantic" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
   message(STATUS "CMAKE_CXX_FLAGS= ${CMAKE_CXX_FLAGS}")
 endif()