I was able to cross compile Plan9 from MacOS which is probably quite similar

to cross compiling from Linux.

The first thing was to compile the plan9 C compilers

on MacOS. I used https://code.google.com/p/ken-cc/ because this fork

of the Plan9 C compilers are easier to compile on non-plan9 OSes.

Then I installed plan9port which contained a few utilities that are used

when compiling the plan9 kernel (/bin/rc, /bin/mk).

Then I setup a few symlinks at the root e.g.

/lib -> /home/pad/plan9/root/lib

/386 -> /home/pad/plan9/root/386

/sys -> /home/pad/plan9/sys

Finally I have a env.sh that I source that contains important environment variables:

export KENCC=/home/pad/kencc

# need to modify plan9/src/cmd/mk/shell.c and put rcshell as default shell

export PLAN9=/usr/local/plan9

export PATH=$PLAN9/bin:$KENCC/bin:$PATH

#for 8._cp to be found and called

PATH=$PATH:.

export objtype=386

#export objtype=arm

export cputype=386

Then I did a few modifications to plan9 Labs and was able to compile and run everything

On Jul 5, 2014, at 7:02 AM, Charles Forsyth <charles.forsyth@gmail.com>

wrote:

On 5 July 2014 14:13, Aleksandar Kuktin <akuktin@gmail.com> wrote:

Are there any pointers or short instructions or a HOWTO or something
similar on the art of cross-compiling Plan 9 from Linux?

It would be easier to compile using 9vx under Linux, or a virtual plan 9 machine in qemu under Linux.

It is possible to cross-compile directly, but I've only built and used that environment twice myself

(once for Solaris, once for Linux), and it isn't any longer in any distributable shape. It might reappear

as a side effect of some work on the compiler suite. It's similar to the way Inferno's kernel is cross

compiled using the Plan 9 compilers hosted by some other OS, but needs a few special twists to

deal with the Plan 9 source tree.