enforce CMake version consistently (currently 7 different ones) #1311
Description
The docs in this repo specify we require CMake 3.15.5 for Windows and macOS, and some unspecified version for Linux. Within our CMakeLists.txt's, we variously enforce 6 distinct minimum versions depending on what you build. There is also a set-cmake-path.ps1 that specifies 3.14, and some other ps1 files that do not specify it.
from CMakeLists.txt's:
cmake_minimum_required(VERSION 2.8.12.2)
cmake_minimum_required(VERSION 3.8) # This project is only included on Win32 platforms so we can have a higher CMake version requirement since we already require a newer CMake version on Windows for various reasons.
cmake_minimum_required(VERSION 3.14)
cmake_minimum_required (VERSION 2.6)
cmake_minimum_required (VERSION 2.8.12)
cmake_minimum_required(VERSION 2.4.4)
67,102: Throw "This repository requires CMake 3.14. The newest version of CMake installed is $version. Please install CMake 3.14 or newer from http://www.cmake.org/download/ and ensure it is on your path."
@jkoritzinsky @ViktorHofer do we require the same version across all parts of the tree and host platforms? What version(s)?
Once this is clear we can fix documentation and checks.