# $NetBSD: host-mkdep.in,v 1.33 2023/07/10 08:55:44 rin Exp $

#!@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