busybox/scripts/gen_build_files.sh

#!/bin/sh

test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }

# cd to objtree
cd "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }

srctree="$1"

find -type d | while read; do
    d="$REPLY"

    src="$srctree/$d/Kbuild.src"
    dst="$d/Kbuild"
    if test -f "$src"; then
	echo "  CHK     $dst"

	s=`sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c`
	echo "# DO NOT EDIT. This file is generated from Kbuild.src" >"$dst.$$.tmp"
	while read; do
	    test x"$REPLY" = x"INSERT" && REPLY="$s"
	    printf "%s\n" "$REPLY"
	done <"$src" >>"$dst.$$.tmp"

	if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
	    rm "$dst.$$.tmp"
	else
	    echo "  GEN     $dst"
	    mv "$dst.$$.tmp" "$dst"
	fi
    fi

    src="$srctree/$d/Config.src"
    dst="$d/Config.in"
    if test -f "$src"; then
	echo "  CHK     $dst"

	s=`sed -n 's@^//config:@@p' "$srctree/$d"/*.c`
	echo "# DO NOT EDIT. This file is generated from Config.src" >"$dst.$$.tmp"
	while read; do
	    test x"$REPLY" = x"INSERT" && REPLY="$s"
	    printf "%s\n" "$REPLY"
	done <"$src" >>"$dst.$$.tmp"

	if test -f "$dst" && cmp -s "$dst.$$.tmp" "$dst"; then
	    rm "$dst.$$.tmp"
	else
	    echo "  GEN     $dst"
	    mv "$dst.$$.tmp" "$dst"
	fi
    fi

done

# Last read failed. This is normal. Don't exit with its error code:
exit 0