106 lines
3.3 KiB
Bash
106 lines
3.3 KiB
Bash
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#!/bin/bash
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#
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# Copyright 2012 Luis R. Rodriguez <mcgrof@frijolero.org>
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# Copyright 2011 Hauke Mehrtens <hauke@hauke-m.de>
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# Copyright 2011 John W. Linville <linville@tuxdriver.com>
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#
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# Use this to parse a small .config equivalent looking file to generate
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# our own autoconf.h. This file has defines for each config option
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# just like the kernels include/linux/autoconf.h
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#
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# XXX: consider using scripts/kconfig/confdata.c instead.
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# On the downside this would require the user to have libc though.
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# This indicates which is the oldest kernel we support
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# Update this if you are adding support for older kernels.
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OLDEST_KERNEL_SUPPORTED="2.6.24"
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if [ $# -ne 1 ]; then
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echo "Usage $0 config-file"
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exit
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fi
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COMPAT_CONFIG="$1"
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if [ ! -f $COMPAT_CONFIG ]; then
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echo "File $1 is not a file"
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exit
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fi
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# Defines a CONFIG_ option if not defined yet, this helps respect
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# linux/autoconf.h
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function define_config {
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VAR=$1
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VALUE=$2
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case $VALUE in
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n) # Try to undefine it
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echo "#undef $VAR"
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;;
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y)
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echo "#ifndef $VAR"
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echo "#define $VAR 1"
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echo "#endif /* $VAR */"
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;;
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m)
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echo "#ifndef $VAR"
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echo "#define $VAR 1"
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echo "#endif /* $VAR */"
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;;
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*) # Assume string
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# XXX: add better checks to make sure what was on
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# the right was indeed a string
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echo "#ifndef $VAR"
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echo "#define $VAR \"$VALUE\""
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echo "#endif /* $VAR */"
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;;
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esac
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}
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function kernel_version_req {
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VERSION=$(echo $1 | sed -e 's/\./,/g')
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echo "#if (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION))"
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echo "#error compat requirement: Linux >= $VERSION"
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echo "#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION) */"
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}
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cat <<EOF
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#ifndef COMPAT_AUTOCONF_INCLUDED
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#define COMPAT_AUTOCONF_INCLUDED
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/*
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* Automatically generated C config: don't edit
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*/
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EOF
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# Checks user is compiling against a kernel we support
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kernel_version_req $OLDEST_KERNEL_SUPPORTED
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# For each CONFIG_FOO=x option
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for i in $(egrep '^CONFIG_|^ifdef CONFIG_|^ifndef CONFIG_|^endif #CONFIG_|^else #CONFIG_' $COMPAT_CONFIG | sed 's/ /+/'); do
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case $i in
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'ifdef+CONFIG_'* )
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echo "#$i" | sed -e 's/+/ /' -e 's/\(ifdef CONFIG_COMPAT_KERNEL_3_\)\([0-9]*\)/if (LINUX_VERSION_CODE < KERNEL_VERSION(3,\2,0))/' -e 's/\(ifdef CONFIG_COMPAT_KERNEL_2_6_\)\([0-9]*\)/if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,\2))/' -e 's/\(ifdef CONFIG_COMPAT_RHEL_\)\([0-9]*\)_\([0-9]*\)/if (defined(RHEL_MAJOR) \&\& RHEL_MAJOR == \2 \&\& RHEL_MINOR >= \3)/' -e 's/\(#ifdef \)\(CONFIG_[^:space:]*\)/#if defined(\2) || defined(\2_MODULE)/'
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continue
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;;
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'ifndef+CONFIG_'* )
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echo "#$i" | sed -e 's/+/ /' -e 's/\(ifndef CONFIG_COMPAT_KERNEL_3_\)\([0-9]*\)/if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,\2,0))/' -e 's/\(ifndef CONFIG_COMPAT_KERNEL_2_6_\)\([0-9]*\)/if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,\2))/' -e 's/\(ifndef CONFIG_COMPAT_RHEL_\)\([0-9]*\)_\([0-9]*\)/if (!defined(RHEL_MAJOR) || RHEL_MAJOR != \2 || RHEL_MINOR < \3)/' -e 's/\(#ifndef \)\(CONFIG_[^:space:]*\)/#if !defined(\2) \&\& !defined(\2_MODULE)/'
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continue
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;;
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'else+#CONFIG_'* | 'endif+#CONFIG_'* )
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echo "#$i */" |sed -e 's/+#/ \/* /g'
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continue
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;;
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CONFIG_* )
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# Get the element on the left of the "="
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VAR=$(echo $i | cut -d"=" -f 1)
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# Get the element on the right of the "="
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VALUE=$(echo $i | cut -d"=" -f 2)
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# Any other module which can *definitely* be built as a module goes here
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define_config $VAR $VALUE
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continue
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;;
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esac
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done
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echo "#endif /* COMPAT_AUTOCONF_INCLUDED */"
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