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Date: Fri, 3 May 2002 18:41:04 +0200
From: tomas szepe <kala@pinerecords.com>
To: Keith Owens <kaos@ocs.com.au>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: kbuild 2.5 release 2.4
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> >$ make -f Makefile-2.5 menuconfig
> >[enable RAMDISK support, tweak ramdisk size, enable initrd]
> >...
> >
> >Now, issuing "M installable" will result in nearly all files getting rebuilt.
> >The same happens when switching ramdisk off again. How's that?
> >
> >I tried enabling/disabling many other config options and doing rebuilds but
> >couldn't find anything as damaging buildtime-wise as the ramdisk stuff.
> 
> CONFIG_BLK_DEV_INITRD is tested in include/linux/fs.h.  Because of the
> messy kernel include files, a config change to fs.h affects hundreds of
> other files and forces lots of rebuilds.  This is a separate problem
> from kbuild, other people are looking at cleaning up the include files.


Hold on, there's more :)

/1/

$ cd ~ && rm -rf build && mkdir build && cd build
$ export KBUILD_SRCTREE_000=/usr/src/linux-2.5.13
$ export KBUILD_OBJTREE=$PWD
$ alias M="make -f $KBUILD_SRCTREE_000/Makefile-2.5"
$ touch foo bar baz
$ M mrproper
spec value %p not found
$ ls foo bar baz
/bin/ls: foo: No such file or directory
/bin/ls: bar: No such file or directory
/bin/ls: baz: No such file or directory
$ # oh my! wherez mah precious files gone!

--> *BUUUURN*

/2/

$ cd ~ && rm -rf build && mkdir build && cd build
$ cp /lib/modules/2.5.13/.config .
$ M oldconfig installable
...

--> kbuild repeats launching "oldconfig" till I hit C-c,
never proceeds to "installable".

Of course, issuing "M oldconfig && M installable" works.


T.