[WIP] Cmake

[mjvankampen]

Some todos:

• [ ] Wait until USNavalResearchLaboratory/protolib#16 is in.
• [ ] Fix some unintentional changes (unixPostProcess.cpp, some examples).
• [ ] Discuss what cmake version is acceptable (FetchContent is only >= 3.11).
• [ ] Test WAF and make to see if I did not break anything.
• [ ] Test more platforms

[NWittje]

I am using Norm in a separate project with cross linux/windows usage, so CMake integration greatly appreciated!

[b00ga]

I don’t quite have it working yet, but I’ve been working on another NRL code base using ExternalProject. I think this is the right way to include other sources, as opposed to FetchContent. https://cmake.org/cmake/help/latest/module/ExternalProject.html

[mjvankampen]

FetchContent is the configure time version of external project . Imho quite a bit nicer.

Do you have a protolib somewhere else on your system. Cmake might pick that one up instead of using FetchContent

[b00ga]

Here's a comparison of CMake versions across various platforms/repositories: https://gist.github.com/b00ga/21b3edf4de1805d098d1bad9af21d4b9#file-cmake-versions-md

3.11 minimum means bringing your own CMake to RHEL/CentOS 6, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Debian 9.