It was reported on the mailing list: * July 2018: [Is this an intended change to cmake behavior in cmake 3.12?](https://cmake.org/pipermail/cmake/2018-July/067898.html) that a `CMP0048` warning appears on the second run of this project. The `CMakeLists.txt`: ```cmake cmake_minimum_required(VERSION 3.7 FATAL_ERROR) list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}) include(foo) test_project(runtime TRUE VERSION 1.0) ``` The `foo.cmake`: ```cmake macro(test_project name target) project(${name} ${ARGN}) endmacro(test_project) ```