CMP0031

The load_command() command should not be called.

This command was added in August 2002 to allow projects to add arbitrary commands implemented in C or C++. However, it does not work when the toolchain in use does not match the ABI of the CMake process. It has been mostly superseded by the macro() and function() commands.

CMake >= 3.0 prefer that this command never be called. The OLD behavior for this policy is to allow the command to be called. The NEW behavior for this policy is to issue a FATAL_ERROR when the command is called.

This policy was introduced in CMake version 3.0. CMake version 3.15.7 warns when the policy is not set and uses OLD behavior. Use the cmake_policy() command to set it to OLD or NEW explicitly.