CMAKE_<LANG>_HOST_COMPILER_ID
-----------------------------

.. versionadded:: 3.31

This variable is available when ``<LANG>`` is ``CUDA`` or ``HIP``
and :variable:`CMAKE_<LANG>_COMPILER_ID` is ``NVIDIA``.
It contains the identity of the host compiler invoked by ``nvcc``,
either by default or as specified by :variable:`CMAKE_<LANG>_HOST_COMPILER`,
among possibilities documented by :variable:`CMAKE_<LANG>_COMPILER_ID`.

.. versionadded:: 4.5
  This variable is also available when ``<LANG>`` is ``SYCL`` and
  :variable:`CMAKE_<LANG>_COMPILER_ID` is ``AdaptiveCpp``.  It identifies the
  underlying host compiler used by the AdaptiveCpp driver.

  .. note::
    SYCL support is experimental and gated by ``CMAKE_EXPERIMENTAL_SYCL``.