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