Raptor needs to drop compatibility with CMake <3.5 to build on CMake 4

[adamnovak]

With CMake 4, CMake has started failing the build when it finds a CMakeLists.txt that claims to be compatible back to a version lower than 3.5, because they don't believe the CI systems are using CMake that old and because they don't want to maintain all the policy code back that far, as I understand it.

See for example: https://stackoverflow.com/a/79535141

So it looks like:

raptor/CMakeLists.txt

Line 20 in 071d9f5

CMAKE_MINIMUM_REQUIRED(VERSION 2.8.7)

Should be changed to at least 3.5, and possibly 3.10...4.0 to show it's tested up through 4.0 and to avoid deprecated versions that will soon similarly be errors to still support.

[adamnovak]

I might be misunderstanding this; it's possible 2.8.7...4.0 will say the project can build with the default policies of any CMake in that range, and in any future CMake that supports back to the policy defaults of 4.0. See https://github.com/xxsds/DYNAMIC/blob/0540076fcffb642c2a5d485b077cc1e4f7eb92de/CMakeLists.txt#L1 which CMake 4.0 is happy with. See also: https://cmake.org/cmake/help/v4.0/command/cmake_minimum_required.html and its concept of a policy version.