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* cmake_minimum_required: Tolerate unknown future argumentsBrad King2018-03-265-0/+9
| | | | | | | | | When a `...<max>` version is given that is larger than the running version of CMake, assume that the project is aware of a newer version of CMake and that any unknown arguments are future arguments. This will allow future versions of CMake to add arguments to the command that projects can use without introducing errors in older versions of CMake (back to 3.12).
* cmake_minimum_required: Optionally set policies with version rangeBrad King2018-03-216-0/+79
| | | | | | | | Teach `cmake_minimum_required` and `cmake_policy(VERSION)` to support a version range of the form `<min>[...<max>]`. Define this to mean that version `<min>` is required, but known policies up to those introduced by `<max>` will be set to `NEW`. This will allow projects to easily specify a range of versions for which they have been updated.
* Drop compatibility with CMake < 2.4Brad King2013-10-2310-0/+31
Drop all behavior activated by setting CMAKE_BACKWARDS_COMPATIBILITY to a value lower than 2.4, and generate an error when projects or the user attempt to do so. In the error suggest using a CMake 2.8.x release. Teach cmake_minimum_required to warn about projects that do not require at least CMake 2.4. They are not supported by CMake >= 3.0. Replace the documentation of CMAKE_BACKWARDS_COMPATIBILITY with a reference to policy CMP0001.