This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
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
CMAKE_CXX_COMPILER. For any configuration run (including the first), the environment variable will be ignored if the
CMAKE_CXX_COMPILER variable is defined.
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