Modern CMake usage about nanoflann HOT 2 CLOSED

I totally agree that users should upgrade and use more recent versions of CMake. I'm using CMake 3.10, but still need to link to third party libraries in the old fashioned way (for instance to nanoflann). That's my motivation for contributing a patch.

Ubuntu 14.04 LTS reaches EOF next year, other distros mostly use more recent CMake versions. I would also suggest to require at least 3.1. Ubuntu 16.04 LTS with 3.5 should be considered the oldest supported version now that we also have 18.04 LTS. But the decision is up to @jlblancoc.

If we agree to bump the requirements, I'll propably extend this to a more general overhaul.

from nanoflann.

My two cents: Anybody still using <CMake-3.0 should seriously consider upgrading, and it's on themselves if projects don't work anymore. I agree Ubuntu LTS's old CMake versions are a pain, but you can just download a newer cmake zip file from cmake.org, unzip it to your home directly, add it to your path, and be done with it. It's dead simple.
Project should require at least 3.2/3.3, better even 3.8.2. Seriously - move on and upgrade. It's dead simple. Just a zip file to download and unzip. Works on any system, without sudo rights.

from nanoflann.