--- /dev/null
+Enable building with g++ 9.x
+
+Disable -Werror for new warning "deprecated-copy" to avoid build
+failure in the packaged copy of googletest with g++ 9.x. This is
+hopefully temporary until googletest is upgraded or it becomes
+straightforward to build against an externally provided copy.
+
+Upstream-Status: pending
+
+Signed-off-by: Scott Murray <scott.murray@konsulko.com>
+
+diff --git a/ThirdParty/googletest-release-1.8.0/googletest/cmake/internal_utils.cmake b/ThirdParty/googletest-release-1.8.0/googletest/cmake/internal_utils.cmake
+index 777b91e..7832f20 100644
+--- a/ThirdParty/googletest-release-1.8.0/googletest/cmake/internal_utils.cmake
++++ b/ThirdParty/googletest-release-1.8.0/googletest/cmake/internal_utils.cmake
+@@ -91,7 +91,7 @@ macro(config_compiler_and_linker)
+ set(cxx_no_exception_flags "-D_HAS_EXCEPTIONS=0")
+ set(cxx_no_rtti_flags "-GR-")
+ elseif (CMAKE_COMPILER_IS_GNUCXX)
+- set(cxx_base_flags "-Wall -Wshadow")
++ set(cxx_base_flags "-Wall -Wshadow -Wno-error=deprecated-copy")
+ set(cxx_exception_flags "-fexceptions")
+ set(cxx_no_exception_flags "-fno-exceptions")
+ # Until version 4.3.2, GCC doesn't define a macro to indicate