Date: Sun, 14 Nov 2004 05:56:11 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Gert Cuykens <gert.cuykens@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: buildkernel before buildworld Message-ID: <20041114035611.GA28482@gothmog.gr> In-Reply-To: <ef60af0904111318415ab633e7@mail.gmail.com> References: <ef60af0904111318415ab633e7@mail.gmail.com>
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On 2004-11-14 03:41, Gert Cuykens <gert.cuykens@gmail.com> wrote: > What happens if you first buildkernel before the buildworld ? If you have previously finished a buildworld and haven't updated your source tree in the meantime, nothing too bad. With a /usr/obj tree around from the previous buildworld stage, you can add options to your kernel configuration and run buildkernel, or even: # cd /usr/src/sys/i386/conf # config -g -d /usr/obj/usr/src/sys/CUSTOM CUSTOM # cd /usr/obj/usr/src/sys/CUSTOM # make depend && make all && make install If you have just added a single option to the kernel configuration or have made minor modifications to the kernel source, this will cut down on the build time. A lot. I have used this method while testing kernel modifications and managed to build, boot, and test more than 10 slightly different kernels in less than 3 hours. After an update of the entire source tree though, building a kernel only may end up with a kernel that is not in sync with the userland. Then, a lot of things may break in unexpected ways. See, for example: http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/faq/book.html#NLIST-FAILED If you are not sure things will work without a buildworld, it's wiser to follow the upgrade procedure recommended in /usr/src/UPDATING. - Giorgos
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