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+HIPCXX
+------
+
+.. versionadded:: 3.21
+
+.. include:: ENV_VAR.txt
+
+Preferred executable for compiling ``HIP`` language files. Will only be used by
+CMake on the first configuration to determine ``HIP`` compiler, after which the
+value for ``HIP`` is stored in the cache as
+:variable:`CMAKE_HIP_COMPILER <CMAKE_<LANG>_COMPILER>`. For any configuration
+run (including the first), the environment variable will be ignored if the
+:variable:`CMAKE_HIP_COMPILER <CMAKE_<LANG>_COMPILER>` variable is defined.