Fluent-bit on openBSD 6.8

[hng1130]

Hello,
after some problems, I succeeded building fluent-bit v4.0.2 on openBSD6.8, using clang 10, which was selected by cmake.
But when I start fluent-bit as is suggested in README.md:
bin/fluent-bit -i cpu -o stdout -f 1

I get this error:
[2025/05/09 09:29:58] [error] [config] section 'cpu' tried to instance a plugin name that doesn't exist
[2025/05/09 09:29:58] [error] configuration file contains errors, aborting.

Did somebody build fluent-bit on openBSD, or has an idea how to solve this?
Any help would be much appreciated, thanks

[patrick-stephens]

With no details on how you actually built it then it's going to be hard to help you. What did you actually do to set up your environment and build things?

OpenBSD is always "fun" so my guess is that you have disabled building of the CPU plugin either via cmake rules or missing dependencies or conditional compilation.

Your cmake output will indicate what happened and why, i.e. what plugins were enabled along with the various tests.

[hng1130]

Your'e right, I didn't check the actually built inputs. Seems like cpu is not one of them.
So I changed the call to fluent-bit like this:
fluent-bit -i tail -p path=/fluent-bit/Events.log -o stdout -f 1

The (shortened) response is:
[2025/05/12 15:31:36] [ info] [fluent bit] version=4.0.2, commit=2fe47eb36d, pid=57993
[2025/05/12 15:31:36] [ info] [storage] ver=1.5.3, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2025/05/12 15:31:36] [ info] [simd ] disabled
[2025/05/12 15:31:36] [ info] [cmetrics] version=1.0.0
[2025/05/12 15:31:36] [ info] [output:stdout:stdout.0] worker #0 started
[2025/05/12 15:31:36] [ info] [ctraces ] version=0.6.5
[2025/05/12 15:31:36] [ info] [input:tail:tail.0] initializing
[2025/05/12 15:31:36] [ info] [input:tail:tail.0] storage_strategy='memory' (memory only)
[2025/05/12 15:31:36] [ info] [sp] stream processor started
[2025/05/12 15:31:36] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:38] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:41] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:43] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:46] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=63] File name too long
[2025/05/12 15:31:48] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:51] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:53] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=2] No such file or directory
[2025/05/12 15:31:56] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=63] File name too long
[2025/05/12 15:31:58] [error] [/home/projects/fluent-bit/plugins/in_tail/tail_file.c:1713 errno=63] File name too long

I attach some files:
CMakeLists.txt
flb_scheduler.c_change_.txt
fluent-bit_build_OpenBSD.txt

-CMakeLists.txt is the file I used
-I changed flb_scheduler.c, because it reported an error right off the bat:
[/home/projects/fluent-bit/src/flb_scheduler.c:75 errno=0] Undefined error: 0
-The build output is in fluent-bit_build_OpenBSD.txt.

I built without JeMalloc, because it seems to be incompatible with openBSD. It uses some data type available in freeBSD, but not openBSD. I had to manually change the link.txt files of the executable and the dynamic library, replaced the references to the SSL libraries. They originally pointed to old versions, I changed them to point to SSL v2 libraries, e.g.:
/usr/lib/libssl.so.48.1 to
/usr/local/lib/libssl.so.1.1

I changed the build of the backtrace library from -g to -g0, because I ran into an error:|
ld: error: dwarf.c:(.debug_info+0x9CB8): has non-ABS relocation R_386_GOTOFF against symbol '.LC35'

I hope this gives you more insight
Thanks