load_command

From Get docs
Cmake/docs/3.21/command/load command


load_command

Disallowed since version 3.0. See CMake Policy CMP0031.

Load a command into a running CMake.

load_command(COMMAND_NAME <loc1> [loc2 ...])

The given locations are searched for a library whose name is cmCOMMAND_NAME. If found, it is loaded as a module and the command is added to the set of available CMake commands. Usually, try_compile() is used before this command to compile the module. If the command is successfully loaded a variable named

CMAKE_LOADED_COMMAND_<COMMAND_NAME>

will be set to the full path of the module that was loaded. Otherwise the variable will not be set.

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https://cmake.org/cmake/help/v3.21/command/load_command.html