This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Preferred executable for compiling
C language files. Will only be used by CMake on the first configuration to determine
C compiler, after which the value for
CC is stored in the cache as
CMAKE_C_COMPILER. For any configuration run (including the first), the environment variable will be ignored if the
CMAKE_C_COMPILER variable is defined.
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