Quoting Zeus Odin <zeus.o...@yahoo.com> (from Mon, 29 Aug 2022 09:48:48 -0400):

I have a multi-boot system with Arch Linux, FreeBSD, OS X, and Windoze. Arch Linux kernel version is up to 5.19.2. Should that affect our decision?

[zeus@olympus ~]$ uname -a
Linux olympus.gods.org 5.19.2-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 17 Aug 2022 13:48:51 +0000 x86_64 GNU/Linux
[zeus@olympus ~]$ uname -srm
Linux 5.19.2-arch1-1 x86_64

Will look at sysctl compat.linux.osrelease. Could someone give any direction in rebuilding my base-c7 or perhaps I can create base-c8. Thanks.

If you want to add a new linux_base port, the following links will provide helpful info to understand what is involved and what shall or shall not be in a linux_base port:

https://www.leidinger.net/blog/2010/09/28/the-freebsd-linuxulator-explained-for-users/
https://www.leidinger.net/blog/2011/08/29/howto-create-a-new-linux_base-port/
https://www.leidinger.net/blog/2011/09/01/howto-add-linux-infrastructure-ports-for-a-new-linux_base-port/

Increasing the linux version string (compat.linux.osrelease) may have implications. Linux software may use that to enable certain features of the software which relies on kernel behavior or linux syscalls. If you change that, it may cause console messages about unimplemented syscalls. If you are lucky, you / your software doesn't really need the features of the kernel.

Even the current version string is "lying". We do not support all the features of the announced linux version. But for the linux programs in ports it is good enough and some checks about the kernel version are overly restrictive in some linux programs / libraries.

Note, there is no "linux compat kernel" to recompile from source. The linuxolator is not an emulator, it is a compatibility shim (= it translates from linux syscalls to FreeBSD syscalls = some are the same and no translation is needed, and some are a little bit different and need only a little mapping between numbers or the data-layout). So if your software complains about a missing syscall (or respectively the kernel tells about unimplemented syscalls in the console), it means you can not take some stuff from linux and run it, it means some FreeBSD code needs to be written to make it work.

Bye,
Alexander.

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