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+#!/bin/bash
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+# Manipulate options in a .config file from the command line
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+
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+myname=${0##*/}
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+
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+# If no prefix forced, use the default BR2_
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+BR2_PREFIX="${BR2_PREFIX-BR2_}"
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+
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+usage() {
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+ cat >&2 <<EOL
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+Manipulate options in a .config file from the command line.
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+Usage:
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+$myname options command ...
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+commands:
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+ --enable|-e option Enable option
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+ --disable|-d option Disable option
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+ --set-str option string
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+ Set option to "string"
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+ --set-val option value
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+ Set option to value
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+ --undefine|-u option Undefine option
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+ --state|-s option Print state of option (n,y,m,undef)
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+
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+ --enable-after|-E beforeopt option
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+ Enable option directly after other option
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+ --disable-after|-D beforeopt option
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+ Disable option directly after other option
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+
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+ commands can be repeated multiple times
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+
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+options:
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+ --file config-file .config file to change (default .config)
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+ --keep-case|-k Keep next symbols' case (dont' upper-case it)
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+ --package|-p Operate on package (set prefix to BR2_PACKAGE_)
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+
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+$myname doesn't check the validity of the .config file. This is done at next
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+make time.
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+
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+By default, $myname will upper-case the given symbol. Use --keep-case to keep
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+the case of all following symbols unchanged.
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+
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+$myname uses 'BR2_' as the default symbol prefix. Set the environment
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+variable BR2_PREFIX to the prefix to use. Eg.: BR2_PREFIX="FOO_" $myname ...
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+EOL
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+ exit 1
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+}
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+
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+checkarg() {
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+ ARG="$1"
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+ if [ "$ARG" = "" ] ; then
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+ usage
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+ fi
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+ if [ "$MUNGE_CASE" = "yes" ] ; then
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+ ARG="`echo $ARG | tr a-z- A-Z_`"
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+ fi
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+ case "$ARG" in
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+ ${BR2_PREFIX}*)
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+ ARG="${ARG/${BR2_PREFIX}/}"
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+ ;;
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+ esac
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+}
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+
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+txt_append() {
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+ local anchor="$1"
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+ local insert="$2"
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+ local infile="$3"
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+ local tmpfile="$infile.swp"
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+
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+ # sed append cmd: 'a\' + newline + text + newline
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+ cmd="$(printf "a\\%b$insert" "\n")"
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+
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+ sed -i -e "/$anchor/$cmd" "$infile"
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+}
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+
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+txt_subst() {
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+ local before="$1"
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+ local after="$2"
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+ local infile="$3"
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+ local tmpfile="$infile.swp"
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+
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+ sed -i -e "s:$before:$after:" "$infile"
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+}
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+
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+txt_delete() {
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+ local text="$1"
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+ local infile="$2"
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+ local tmpfile="$infile.swp"
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+
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+ sed -i -e "/$text/d" "$infile"
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+}
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+
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+set_var() {
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+ local name=$1 new=$2 before=$3
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+
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+ name_re="^($name=|# $name is not set)"
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+ before_re="^($before=|# $before is not set)"
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+ if test -n "$before" && grep -Eq "$before_re" "$FN"; then
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+ txt_append "^$before=" "$new" "$FN"
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+ txt_append "^# $before is not set" "$new" "$FN"
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+ elif grep -Eq "$name_re" "$FN"; then
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+ txt_subst "^$name=.*" "$new" "$FN"
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+ txt_subst "^# $name is not set" "$new" "$FN"
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+ else
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+ echo "$new" >>"$FN"
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+ fi
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+}
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+
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+undef_var() {
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+ local name=$1
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+
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+ txt_delete "^$name=" "$FN"
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+ txt_delete "^# $name is not set" "$FN"
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+}
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+
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+if [ "$1" = "--file" ]; then
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+ FN="$2"
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+ if [ "$FN" = "" ] ; then
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+ usage
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+ fi
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+ shift 2
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+else
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+ FN=.config
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+fi
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+
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+if [ "$1" = "" ] ; then
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+ usage
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+fi
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+
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+MUNGE_CASE=yes
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+while [ "$1" != "" ] ; do
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+ CMD="$1"
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+ shift
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+ case "$CMD" in
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+ --keep-case|-k)
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+ MUNGE_CASE=no
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+ continue
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+ ;;
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+ --package|-p)
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+ BR2_PREFIX="BR2_PACKAGE_"
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+ continue
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+ ;;
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+ --*-after|-E|-D|-M)
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+ checkarg "$1"
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+ A=$ARG
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+ checkarg "$2"
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+ B=$ARG
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+ shift 2
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+ ;;
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+ -*)
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+ checkarg "$1"
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+ shift
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+ ;;
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+ esac
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+ case "$CMD" in
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+ --enable|-e)
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+ set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=y"
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+ ;;
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+
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+ --disable|-d)
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+ set_var "${BR2_PREFIX}$ARG" "# ${BR2_PREFIX}$ARG is not set"
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+ ;;
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+
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+ --set-str)
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+ # sed swallows one level of escaping, so we need double-escaping
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+ set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=\"${1//\"/\\\\\"}\""
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+ shift
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+ ;;
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+
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+ --set-val)
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+ set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=$1"
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+ shift
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+ ;;
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+ --undefine|-u)
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+ undef_var "${BR2_PREFIX}$ARG"
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+ ;;
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+
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+ --state|-s)
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+ if grep -q "# ${BR2_PREFIX}$ARG is not set" $FN ; then
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+ echo n
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+ else
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+ V="$(grep "^${BR2_PREFIX}$ARG=" $FN)"
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+ if [ $? != 0 ] ; then
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+ echo undef
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+ else
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+ V="${V/#${BR2_PREFIX}$ARG=/}"
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+ V="${V/#\"/}"
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+ V="${V/%\"/}"
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+ V="${V//\\\"/\"}"
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+ echo "${V}"
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+ fi
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+ fi
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+ ;;
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+
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+ --enable-after|-E)
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+ set_var "${BR2_PREFIX}$B" "${BR2_PREFIX}$B=y" "${BR2_PREFIX}$A"
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+ ;;
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+
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+ --disable-after|-D)
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+ set_var "${BR2_PREFIX}$B" "# ${BR2_PREFIX}$B is not set" "${BR2_PREFIX}$A"
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+ ;;
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+
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+ *)
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+ usage
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+ ;;
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+ esac
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+done
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