Building on OS X and Windows about ecl_core

[wolfv]

@stonier there is some more analysis of what's going on in the PR linked here: RoboStack/ros-noetic#51

[stonier]

Whoa, time warp. Been a long time since I've compiled these libraries for windows and mac, maybe 2007? My company shifted entirely over to linux at that time and I stopped 'officially' supporting those platforms due to not having CI around for them.

Having said that, it's probably close to working since the libraries haven't changed much and I do know some people ran kobuki on windows which uses them.

Looks like streams are trying to use sockets but the socket implementation which is not included in an apple build: https://github.com/stonier/ecl_core/blob/devel/ecl_devices/include/ecl/devices/socket.hpp#L28.

The actual application being compiled there, ecl_core_apps/src/benchmarks/streams.cpp doesn't use the socket streams, so that should be fine.

Likely what you need is to just apply the same kind of macro used in devices/socket.hpp for the whole of https://github.com/stonier/ecl_core/blob/devel/ecl_streams/include/ecl/streams/socket_streams.hpp.