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