build custom kernel under FreeBSD 12

[Norbert Koch]

Here is a typescript:

12.0-RELEASE-p7 (3) nk at entw-pr4 [~/src/kernel/src] $ export 
MAKEOBJDIRPREFIX=`realpath tmp`
12.0-RELEASE-p7 (3) nk at entw-pr4 [~/src/kernel/src] $ echo $MAKEOBJDIRPREFIX
/usr/home/nk/src/kernel/src/tmp

12.0-RELEASE-p7 (3) nk at entw-pr4 [~/src/kernel/src] $ make buildkernel
make[1]: "/usr/home/nk/src/kernel/src/Makefile.inc1" line 341: 
SYSTEM_COMPILER: Determined that CC=cc matches the source tree. Not 
bootstrapping a cross-compiler.
make[1]: "/usr/home/nk/src/kernel/src/Makefile.inc1" line 348: 
SYSTEM_LINKER: libclang will be built for bootstrapping a cross-linker.

--------------------------------------------------------------
 >>> Kernel build for GENERIC started on Fri Jul 19 08:34:27 CEST 2019
--------------------------------------------------------------
===> GENERIC
mkdir -p /usr/src/sys

--------------------------------------------------------------
 >>> stage 1: configuring the kernel
--------------------------------------------------------------
cd /usr/home/nk/src/kernel/src/sys/i386/conf; 
PATH=/usr/src/tmp/legacy/usr/sbin:/usr/src/tmp/legacy/usr/bin:/usr/src/tmp/legacy/bin:/usr/src/tmp/usr/sbin:/usr/src/tmp/usr/bin:/sbin:/bin:/usr/sbin:/usr/bin 
config  -d /usr/src/sys/GENERIC  -I 
'/usr/home/nk/src/kernel/src/sys/i386/conf' 
'/usr/home/nk/src/kernel/src/sys/i386/conf/GENERIC'
config: /usr/src/sys/GENERIC: Permission denied
*** Error code 2

Stop.
make[1]: stopped in /usr/home/nk/src/kernel/src
*** Error code 1

Stop.
make: stopped in /usr/home/nk/src/kernel/src


Am 2019-07-18 um 19:22 schrieb Ryan Stone:
> How are you setting MAKEOBJDIRPREFIX?  It needs to be set in your
> environment, i.e.
>
> $ export MAKEOBJDIRPREFIX=$HOME/obj
> $ make buildkernel
>
> Trying 'make MAKEOBJDIRPREFIX=$HOME/obj buildkernel' will fail in
> strange ways due to how make passes arguments to sub-makes.
>
> On Thu, Jul 18, 2019 at 9:53 AM Norbert Koch <nkoch at demig.de> wrote:
>> Hello.
>>
>> I am obviously too stupid to figure out how to build a custom kernel
>> as non-root user in a non-standard directory.
>> Under FreeBSD9/10/11 I could put src/ under my own directory
>> and start a kernel-compilation by just setting $MAKEOBJDIRPREFIX
>> accordingly. Doing this under FreeBSD12 gives me 'permission denied'
>> with 'config -d /usr/src/sys/GENERIC ...'. Seems like ${KRNLOBJDIR} is
>> not set correctly while the other parameters to config are.
>> I see that Makefiles differ between 12 and older releases.
>> ${OBJTOP} vs. ${OBJTREE}?
>>
>> So, what am I doing wrong?
>>
>> Thank you for any help.
>>
>>
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-- 
Dipl.-Ing. Norbert Koch
Entwicklung Prozessregler