xkaraman left a comment (kamailio/kamailio#4516)
OK i can think i understand why it not builds.
So `futex` locking is available on `armv6|7` OR `arm` arch but only if `NOSMP`
is defined.
Old Makefiles defined both `USE_FUTEX` and `USE_FASTLOCK`, but defined also
`NOSMP` when setting `use_fast_lock`. I can't be sure which is actually used
tbh. I am probably guessing it is `futex` since `NOSMP` is also defined and it
has priority in the `lock_ops.h`.
Now, with the current changes on `cmake`, we detected it's `arm` (even if its
arm7 as discussed in previous issues) and we accept that it has `futex`
capabilities but we do not provide the `NOSMP` definition in this case only in
when `fast_lock` is used.
Before the changes, we just used `fast_lock` detection as you can see in this
build
https://github.com/sergey-safarov/kamailio/actions/runs/20122466906/job/57745456690#step:8:136.
For the fix, 2 cases i can think of (i couldn't verify as docker arm32v7 ubuntu
image had some troubles installing packages for me)
1. Define `NOSMP` for the `futex` so it can compile
2. Remove `futex` support for arm and use `fast_lock` as before.
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