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Diffstat (limited to 'compat/scripts/gen-compat-autoconf.sh')
| -rwxr-xr-x | compat/scripts/gen-compat-autoconf.sh | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/compat/scripts/gen-compat-autoconf.sh b/compat/scripts/gen-compat-autoconf.sh new file mode 100755 index 00000000..e52cc5aa --- /dev/null +++ b/compat/scripts/gen-compat-autoconf.sh @@ -0,0 +1,105 @@ +#!/bin/bash +# +# Copyright 2012 Luis R. Rodriguez <mcgrof@frijolero.org> +# Copyright 2011 Hauke Mehrtens <hauke@hauke-m.de> +# Copyright 2011 John W. Linville <linville@tuxdriver.com> +# +# Use this to parse a small .config equivalent looking file to generate +# our own autoconf.h. This file has defines for each config option +# just like the kernels include/linux/autoconf.h +# +# XXX: consider using scripts/kconfig/confdata.c instead. +# On the downside this would require the user to have libc though. + +# This indicates which is the oldest kernel we support +# Update this if you are adding support for older kernels. +OLDEST_KERNEL_SUPPORTED="2.6.24" + +if [ $# -ne 1 ]; then + echo "Usage $0 config-file" + exit +fi + +COMPAT_CONFIG="$1" + +if [ ! -f $COMPAT_CONFIG ]; then + echo "File $1 is not a file" + exit +fi + +# Defines a CONFIG_ option if not defined yet, this helps respect +# linux/autoconf.h +function define_config { + VAR=$1 + VALUE=$2 + case $VALUE in + n) # Try to undefine it + echo "#undef $VAR" + ;; + y) + echo "#ifndef $VAR" + echo "#define $VAR 1" + echo "#endif /* $VAR */" + ;; + m) + echo "#ifndef $VAR" + echo "#define $VAR 1" + echo "#endif /* $VAR */" + ;; + *) # Assume string + # XXX: add better checks to make sure what was on + # the right was indeed a string + echo "#ifndef $VAR" + echo "#define $VAR \"$VALUE\"" + echo "#endif /* $VAR */" + ;; + esac +} + +function kernel_version_req { + VERSION=$(echo $1 | sed -e 's/\./,/g') + echo "#if (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION))" + echo "#error compat requirement: Linux >= $VERSION" + echo "#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION) */" +} + +cat <<EOF +#ifndef COMPAT_AUTOCONF_INCLUDED +#define COMPAT_AUTOCONF_INCLUDED +/* + * Automatically generated C config: don't edit + */ +EOF + +# Checks user is compiling against a kernel we support +kernel_version_req $OLDEST_KERNEL_SUPPORTED + +# For each CONFIG_FOO=x option +for i in $(egrep '^CONFIG_|^ifdef CONFIG_|^ifndef CONFIG_|^endif #CONFIG_|^else #CONFIG_' $COMPAT_CONFIG | sed 's/ /+/'); do + case $i in + 'ifdef+CONFIG_'* ) + echo "#$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)/' + continue + ;; + 'ifndef+CONFIG_'* ) + 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)/' + continue + ;; + 'else+#CONFIG_'* | 'endif+#CONFIG_'* ) + echo "#$i */" |sed -e 's/+#/ \/* /g' + continue + ;; + CONFIG_* ) + # Get the element on the left of the "=" + VAR=$(echo $i | cut -d"=" -f 1) + # Get the element on the right of the "=" + VALUE=$(echo $i | cut -d"=" -f 2) + + # Any other module which can *definitely* be built as a module goes here + define_config $VAR $VALUE + continue + ;; + esac +done + +echo "#endif /* COMPAT_AUTOCONF_INCLUDED */" |