I am five machines with my configuration. I build 'CB' without problems with wx-2.8.12 and gcc-510.
For 'OpenSuse-Leap-42.3' : always with native 2.8.12,
- I have not been able to install 3.0.2 next to 2.8.12, but I'm working on it (the native compiler is 4.8.5 !!),
- I'm also trying to install gcc530, gcc730 and use 'update-alternatives' I can not use for 'wx-config'
( these difficulties probably come from my inexperience with LINUX !)
I am also working on the installation of 'openSUSE Tumbleweed' ; wx-3.0.4, 3.1.3 (wxGTK3-3_2) come with 'openSUSE Tumbleweed', but again the coexistence is difficult.
For Windows : for a week I'm trying to install versions 2.8.12, 3.0.1, 3.12 with the gcc-530, gcc-730, gcc-810 compilers as well as build CB from the sdk143 (cb-11793 .. .) : it seems more accessible ...
If the decision is made towards the beginning of September, I think I have made serious progress in all these problems.