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/CMake 3.19

CC

New in version 3.10.

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.

Note

Options that are required to make the compiler work correctly can be included; they can not be changed.

$ export CC="custom-compiler --arg1 --arg2"

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https://cmake.org/cmake/help/v3.19/envvar/CC.html