This implements and idea mentioned by Ingo Molnar on the Linux Kernel Mailing List for designing C interfaces that are binary backward and forward compatible.
In particular, it resembles the perf_event_attr struct parameter of the perf_event_open Linux syscall.
$ nix-build --no-out-link -A test
App 0.1 linked to lib 0.1
What is the answer?
- 42
- 5 (discordia)
App 0.1 linked to lib 0.2
What is the answer?
- 42
- 5 (discordia)
App 0.2 linked to lib 0.2
What is the answer?
- 42
- 5 (discordia)
- 23 (illuminati)
App 0.2 linked to lib 0.1
What is the answer?
- 42
- 5 (discordia)
- 0 (illuminati)