In addition to what others wrote I have yet another way to get these
results. I have to point out that I use emacs in its default
configuration which renames files to their backup name and creates the
modified file under the original name.
Basically I use three directories for each version of Linux:
linux-2.x.orig, linux-2.x, build-2.x. The orig dir contains the
untouched original Linux tree, linux-2.x is a file by file hardlink to
the orig files (cp -lr linux-2.x.orig linux-2.x). build-2.x is then a
symlinked copy of linux-2.x (cp -sr /use/absolute/path/linux-2.x
build-2.x).
When I edit linux-2.x, the hardlinks are severed because of the backup
rename and therefore don't modify the orig tree (patch also works this
way). build-2.x has to be created after you add new files to linux-2.x,
otherwise they would be missing. The symlinks however won't get
severed like the hardlinks do so they always point to the current
sources. Modify in linux-2.x, configure and make in build-2.x.
The hardlinked trees also have another advantage: if diff finds two
files pointing to the same inode, it knows they are identical and skips
them. If you don't have changes all over the kernel, a diff only takes
a few seconds. Don't forget to do make distclean or something similar
on the linux-2.x tree to remove the backup file, they'll end up in your
patch otherwise.
When updating the orig tree, make a current diff on your work, kill
linux-2.x and build-2.x, update/patch orig, copy hardlink linux-2.x,
apply your patch, copy symlink build-2.x.
--
Andreas E. Bombe <andreas.bombe@munich.netsurf.de>
http://home.pages.de/~andreas.bombe/
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