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Subject[PATCH] make updateconfig (for recent 2.4.0-test* kernels)
Here's a little patch I've been using for a while, and which some
people may find useful. It's mainly good for helping with that feeling
that you might miss something when you simply make oldconfig. Any
self-respecting control freak will understand why this is
important ;-)

What this patch does:
- adds -D option to scripts/Configure.
- adds make updateconfig and synonymous make updconfig targets to
invoke scripts/Configure with -D

Configure -D works like -d (i.e. like make oldconfig ) but prints all
options referenced in the old .config, but missing in the new .config.
So you'll know if something that used to be configurable at build time
now is configured at run time, auto-configures, or such, or if a whole
set of options has disappeared, e.g. because of an added dependency or
a new option where you gave the wrong answer.

Known problems: also reports certain options which were written to the
old .config by mistake (or, rather, by a configurator using different
visibility rules), e.g. xconfig adds CONFIG_JFFS_FS_VERBOSE even if
CONFIG_JFFS_FS is not set.

Q: Why don't you just use diff .config.old .config ?
A: This would work if the previous .config file was obtained from
Configure, but menuconfig already leaves some clutter, and a diff
for a .config obtained from xconfig wouldn't be useful without
serious post-processing. Also, a diff repeats new options, which
were already handled by Configure.

- Werner

---------------------------------- cut here -----------------------------------

--- linux/Makefile.orig Thu Aug 31 18:09:34 2000
+++ linux/Makefile Thu Aug 31 18:09:51 2000
@@ -220,6 +220,9 @@
oldconfig: symlinks
$(CONFIG_SHELL) scripts/Configure -d arch/$(ARCH)/config.in

+updconfig updateconfig: symlinks
+ $(CONFIG_SHELL) scripts/Configure -D arch/$(ARCH)/config.in
+
xconfig: symlinks
$(MAKE) -C scripts kconfig.tk
wish -f scripts/kconfig.tk
--- linux/scripts/Configure.orig Thu Aug 31 17:55:44 2000
+++ linux/scripts/Configure Thu Aug 31 18:09:10 2000
@@ -115,7 +115,7 @@
# readln prompt default oldval
#
function readln () {
- if [ "$DEFAULT" = "-d" -a -n "$3" ]; then
+ if [ ! -z "$DEFAULT" -a -n "$3" ]; then
echo "$1"
ans=$2
else
@@ -526,8 +526,8 @@
echo "#define AUTOCONF_INCLUDED" >> $CONFIG_H

DEFAULT=""
-if [ "$1" = "-d" ] ; then
- DEFAULT="-d"
+if [ "$1" = "-d" -o "$1" = "-D" ] ; then
+ DEFAULT=$1
shift
fi

@@ -557,10 +557,24 @@

. $CONFIG_IN

+if [ "$DEFAULT" = -D -a -f $DEFAULTS ]; then
+ sed 's/^# CONFIG_/CONFIG_/;p' <.tmpconfig | cat $DEFAULTS - |
+ sed 's/[#=].*//' | sort | uniq -u >.tmpmissing
+ if [ -s .tmpmissing ]; then
+ echo
+ echo "#"
+ echo "# Unused variables (found in $DEFAULTS)"
+ echo "#"
+ cat .tmpmissing
+ fi
+ rm -f .tmpmissing
+fi
+
rm -f .config.old
if [ -f .config ]; then
mv .config .config.old
fi
+
mv .tmpconfig .config
mv .tmpconfig.h include/linux/autoconf.h

--
_________________________________________________________________________
/ Werner Almesberger, ICA, EPFL, CH Werner.Almesberger@epfl.ch /
/_IN_N_032__Tel_+41_21_693_6621__Fax_+41_21_693_6610_____________________/
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