Bug 209990

Summary:	Kernel configuration NOTES outdated information about COMPAT_43
Product:	Base System	Reporter:	SimpleRezo <simplerezo>
Component:	conf	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	New ---
Severity:	Affects Many People
Priority:	---
Version:	10.3-RELEASE
Hardware:	Any
OS:	Any

Description SimpleRezo 2016-06-03 10:27:12 UTC

In NOTES file, section "COMPATIBILITY OPTIONS":

#
# Implement system calls compatible with 4.3BSD and older versions of
# FreeBSD.  You probably do NOT want to remove this as much current code
# still relies on the 4.3 emulation.  Note that some architectures that
# are supported by FreeBSD do not include support for certain important
# aspects of this compatibility option, namely those related to the
# signal delivery mechanism.
#
options         COMPAT_43
	
# Old tty interface.
options         COMPAT_43TTY


The comment seems outdated since COMPAT_43 has been removed from GENERIC about 10 years now ;)

I'm also suggesting to disable those options by default now on NOTES.

Comment 1 SimpleRezo 2016-06-03 10:31:29 UTC

It seems there is another outdated information here:

# Enable 32-bit Linux ABI emulation (requires COMPAT_43 and COMPAT_FREEBSD32)
#options        COMPAT_LINUX32

But according to commit #159651:
"For amd64 there's an explicit comment that it's needed for the linuxolator. This is not the case anymore."