Fix static linking in cmake on linux #210

[Vlad2001MFS]

Related to issue #210

[AMS21]

Is this still being worked on? I would really like to see something like this merged

[Xottab-DUTY]

Is this still being worked on? I would really like to see something like this merged

There are static variables that are being automatically added to the list of script export nodes. Linker just throws out these variables, and we didn't found a proper way to fix this yet.

This PR has a workaround for that – just manually specifying all nodes in https://github.com/OpenXRay/xray-16/pull/1457/files#diff-6336379129a38e317e4b780bc63a8bf0e146a9418fc5a7df830132326d261053, which is bad of course.

[AMS21]

Alright thanks for the info, maybe I'll try to take a look at it

[AMS21]

After some quick searching around I've found the used and retain attributes which seem to do what we need here although retain is only available starting with clang and lld 13 or binutils 2.36 released 2021-01-24 and gcc 11