#!@BSHELL@ -
#
#	$NetBSD: host-mkdep.in,v 1.33 2023/07/10 08:55:44 rin Exp $
#
# Copyright (c) 1991, 1993
#	The Regents of the University of California.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by the University of
#	California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#	@(#)mkdep.old.compiler	8.1 (Berkeley) 6/6/93
#

APPEND=false
MERGE=false
OPTIONAL=false
AWK_OPTIONAL=
QUIET=false
CPPFLAGS=
NEWEXT=.o
PREFIX=
OUTFILE=.depend
SRCS=

usage()
{
	echo "Usage: $0 [-adopq] [-s .suffixes] [-f .depend] -- [flags] file ..." >&2
	exit 1
}

set_objlist()
{
	if [ -n "$NEWEXT" ]; then
		oifs="$IFS"
		IFS=" ,"
		set -- $NEWEXT
		IFS="$oifs"
		objlist=
		for suf in "$@"; do
			objlist="$objlist${objlist:+ }$PREFIX$file$suf"
		done
	else
		objlist="$PREFIX$file"
	fi
}

# A getopt compatible command line parser in shell comands.
# (don't trust the shell builtin getopts to be in a known state on error)
while [ $# -gt 0 ]; do
	option="${1#-}"
	[ "$option" = "$1" -o -z "$option" ] && break
	while
		optarg="${option#?}"
		option="${option%$optarg}"

		case "-$option" in
		-a)	APPEND=true;;
		-d)	MERGE=true;;
		-o)	OPTIONAL=true; AWK_OPTIONAL='print ".OPTIONAL:" $0';;
		-p)	NEWEXT=;;
		-q)	QUIET=true;;
		-[iv])	;;

		-[fPs])	# Options with arguments
			[ -z "$optarg" ] && {
				[ $# = 1 ] && usage
				shift
				optarg="$1"
			}
			case "-$option" in
			-f)	OUTFILE="$optarg";;
			-P)	PREFIX="$optarg";;
			-s)	NEWEXT="$optarg";;
			esac
			optarg=
			;;

		--)	[ -z "$optarg" ] && shift
			break 2
			;;

		*)	$MERGE && usage
			break 2;
			;;
		esac
		[ -n "$optarg" ]
	do
		option="$optarg"
	done
	shift
done

[ $# = 0 ] && usage

if $MERGE; then
	SRCS="$*"
else
	#
	# Process argument list.
	# This is tricky, because arguments may contain spaces and other
	# escapes characters.  The argument list is used like a tail queue.
	# $cppargs has one x for each unprocessed argument, so when an
	# argument is processed, it is shifted and the corresponding number
	# of x's is removed.  The advantage to counting is that suffix removal
	# works without fork.
	#
	cppargs=
	for arg; do
		cppargs="x$cppargs"
	done
	while [ -n "$cppargs" ]; do
		case "$1" in
		-L)			# takes an arg, but ignored
				shift 2
				cppargs=${cppargs%xx}
				;;

		-c|-[lLMOW]*)		# takes no extra args
				shift
				cppargs=${cppargs%x}
				;;

		-[IDU]*)
				set -- "$@" "$1"
				shift
				cppargs=${cppargs%x}
				;;

		-[IDU]|-include|-iquote|-isystem|-isysroot)
				set -- "$@" "$1" "$2"
				shift 2
				cppargs=${cppargs%xx}
				;;
				
		-isystem-cxx|-cxx-isystem)
				set -- "$@" "-isystem" "$2"
				shift 2
				cppargs=${cppargs%xx}
				;;
		-std=*)
				set -- "$@" "$1"
				shift
				cppargs=${cppargs%x}
				;;

		-no-cpp-precomp)	# This is a Darwin-specific option.
				set -- "$@" "$1"
				shift
				cppargs=${cppargs%x}
				;;

		-nostdinc*)	# This is a gcc/g++ ism; ignore if not gcc/g++
				case "@CFLAGS@" in
				*-O2*)	# Autoconf puts -O2 when gcc only
					set -- "$@" "$1"
					;;
				esac	
				shift
				cppargs=${cppargs%x}
				;;
		--sysroot*)
				shift
				;;
		-[iv])
				shift
				;;
		-*)		
				echo "$0: Unknown option: $1" 1>&2 # all other -options
				exit 1
				;;

		*)	
				SRCS="$SRCS $1"	# source file
				shift
				cppargs=${cppargs%x}
				;;
		esac
	done
fi

[ -z "$SRCS" ] && usage

TMP=/tmp/mkdep$$
rm -f $TMP

trap 'rm -f $TMP; exit 1' 1 2 3 13 15

if $MERGE; then
	for f in $SRCS; do
		if [ ! -f "$f" ]; then
			if ! $QUIET; then echo "$0: Ignoring $f" >&2; fi
			continue
		fi
		while IFS=':'; read target dependents; do
			IFS=
			t1="${target#* }"
			file="${target%.o}"
			if [ "$t1" = "$target" -a "$file" != "$target" ]; then
				set_objlist $file
				target="$objlist"
			fi
			echo "$target:$dependents"
			if "$OPTIONAL"; then
				echo ".OPTIONAL:$dependents"
			fi
		done <$f
	done >$TMP
else
	for f in $SRCS; do
		file=${f##*/}
		file=${file%.*}
		set_objlist $file

		( (@CPP@ "$@" $f; echo $? >&3) | @AWK@ '
			/^#/ {
				# Be as tolerant as possible.
				sub(/^#(line)? [ 0-9]*"?/, "")
				sub(/^#(pragma).*/, "")
				sub(/^<.*/, "")
				sub(/".*$/, "")
				sub(/^\.\//, "")
				sub(/ [ 0-9]*$/, "")

				if ($0 in seenfiles) next
				if ($0 ~ /y.tab.c/) next

				seenfiles[$0] = 1
				print "'"$objlist"'" ": " $0
				'"$AWK_OPTIONAL"'
			}
		' >> $TMP) 3>&1 | (read a; exit $a)
	done
fi

if $APPEND; then
	cat $TMP >> $OUTFILE
else
	cat $TMP > $OUTFILE
fi

rm -f $TMP
exit 0