> In FreeBSD they have /etc/make.conf
> You set CPUTYPE=<YOUR_CPU> there, and
> /usr/share/mk/bsd.cpu.mk will read it, and set -march for CPUCFLAGS
> This variable is used by ports, kernel, and any random Makefile may use it.
> (There are similar things in Linux Gentoo also)
> But OpenBSD /etc/mk.conf does not have it nor bsd.cpu.mk
> exists in /usr/share/mk
> So, OpenBSD does not use this approach, right?
> But why? Is it because most ports ignore it?
Because that's a fantastic way to accidentally build incompatible
snapshots and releases.