===== Brainstorming for enable Kconfig on compat-wireless =====


==== Step 1 ====

Using the existing kernel's config, generate a Kconfig file that contains all the right symbols for that kernel: 
<code>cat .config | genkconf.sh > kernel-kconfig</code>
where the script is this: 
<code>#!/bin/bash

while read line ; do
        case "${line:0:7}" in
        "CONFIG_")
                line="${line:7}"
                cfg="${line%%=*}"
                val="${line#*=}"
                cfgtype="skip"
                if [ "$val" = "m" ] ; then
                        cfgtype="tristate"
                elif [ "$val" = "y" ] ; then
                        cfgtype="bool"
                fi
                if [ "$cfgtype" != "skip" ] ; then
                        echo "config $cfg"
                        echo "    $cfgtype"
                        echo "    default $val"
                        echo ""
                fi
                ;;
        "# CONFI")
                cfg="${line:9}"
                cfg="${cfg%% is not set}"
                echo "config $cfg"
                echo "    bool"
                echo "    default n"
                echo ""
                ;;
        esac
done</code>

==== Step 2 ====

Collect all Kconfig symbols from compat: 
<code>find . -name Kconfig | xargs cat | sed 's/^config //;t;d' > symbols</code>

==== Step 3 ====

Instead of patching Makefiles, replaces all CONFIG_ by CONFIG_COMPAT_ in all Makefiles: 
<code>find . -name Makefile | xargs rpl "CONFIG_" "CONFIG_COMPAT_"</code>
This means that only things that are actually selected in compat will be built. 


==== Step 4 ====

Replace all "FOO" with "COMPAT_FOO" symbols in Kconfig and code files: 
<code>for sym in $(cat symbols) ; do
    find . -name Kconfig |\
        xargs rpl -w "$sym" "COMPAT_$sym"

    find . -name '*.c' -o -name '*.h' |\
        xargs rpl -w "CONFIG_$sym" "CONFIG_COMPAT_$sym"
done</code>

==== Step 5 ====

Build a Kconfig file: 
<code>echo 'source "kernel-kconfig"' > Kconfig
for k in drivers/net/wireless/*/Kconfig ; do echo "source \"$k\"" >> Kconfig ; done</code>
etc. Currently, mac80211/cfg80211/... Kconfig isn't copied. They will need to be copied and potentially modified for dependencies like WEXT. 


==== Step 6 ====

Run menuconfig: 
<code>/lib/modules/$(uname -r)/build/scripts/kconfig/mconf Kconfig</code>

==== Step 7 ====

Build the thing. 

The generated .config can be parsed with either the existing compat-wireless-2.6/scripts/gen-compat-autoconf.sh script or scripts/kconfig/confdata.c (conf --silentoldconfig). The generated include/linux/compat_autoconf.h is already included as part of the build of compat-wireless.