message: find Threads with installed Ginkgo if we built for HIP
diff: @@ -135,10 +135,15 @@ include(${CMAKE_CURRENT_LIST_DIR}/windows_helpers.cmake)
  # NOTE: we do not export benchmarks, examples, tests or devel tools
  # so `third_party` libraries are currently unneeded.
  -# populate CUDA_HOST_COMPILER if Ginkgo was built with CUDA
  +# propagate CUDA_HOST_COMPILER if Ginkgo was built with CUDA
  if (GINKGO_BUILD_CUDA AND GINKGO_CUDA_HOST_COMPILER AND NOT CMAKE_CUDA_HOST_COMPILER)
  message(STATUS "Ginkgo: Setting CUDA host compiler to ${GINKGO_CXX_COMPILER}")
  set(CMAKE_CUDA_HOST_COMPILER "${GINKGO_CXX_COMPILER}" CACHE STRING "" FORCE)
  endif()
  +# HIP depends on Threads::Threads in some circumstances, but doesn't find it
  +if (GINKGO_BUILD_HIP)
  + find_package(Threads REQUIRED)
  +endif()
  +
  include(${CMAKE_CURRENT_LIST_DIR}/GinkgoTargets.cmake)
  