1 #!/bin/sh
2 
3 libsl=""
4 
5 doautolib=true
6 verbose=false
7 
8 if [ "x$1" = "x-l" ]
9 then
10 	shift
11 	doautolib=false
12 elif [ "x$1" = "x-v" ]
13 then
14 	shift
15 	verbose=true
16 fi
17 
18 target=a.out
19 if [ "x$1" = "x-o" ]
20 then
21 	target=$2
22 fi
23 
24 if $doautolib
25 then
26 	ofiles=""
27 	for i
28 	do
29 		case "$i" in
30 		*.o)
31 			ofiles="$ofiles $i"
32 			;;
33 		esac
34 	done
35 	
36 	# echo "ofiles $ofiles"
37 	autolibs=""
38 	if [ "x$ofiles" != "x" ]
39 	then
40 		a=`
41 			nm $ofiles |
42 			grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
43 			sed 's/.*__p9l_autolib_//' |
44 			sort -u
45 		`
46 		for i in $a
47 		do
48 			autolibs="$autolibs $i"
49 			eval "need$i=true"
50 		done
51 	fi
52 
53 	# fetch dependencies out of libraries
54 	workq="$autolibs"
55 	while [ "x$workq" != "x" ]
56 	do
57 		w="$workq"
58 		workq=""
59 		for i in $w
60 		do
61 			a=`
62 				nm $PLAN9/lib/lib$i.a |
63 				grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
64 				sed 's/.*__p9l_autolib_//' |
65 				sort -u
66 			`
67 			okayfn="true"
68 			for j in $a
69 			do
70 				if eval "[ x\$need$j = x ]"
71 				then
72 					autolibs="$autolibs $j"
73 					workq="$workq $j"
74 					eval "need$j=true"
75 				fi
76 				if [ $j != $i ]
77 				then
78 					okayfn="$okayfn && have$j"
79 				fi
80 			done
81 			# echo "can$i: $okayfn"
82 			eval "can$i() { $okayfn; }"
83 		done
84 	done
85 	if $verbose
86 	then
87 		echo "autolibs $autolibs"
88 	fi
89 
90 	for i in $autolibs
91 	do
92 		eval "have$i() { false; }"
93 	done
94 
95 	# now find correct order
96 	libsl=""
97 	while [ "x$autolibs" != x ]
98 	do
99 		stillneed=""
100 		didnothing=true
101 		for i in $autolibs
102 		do
103 			if eval "can$i"
104 			then
105 				libsl="-l$i $libsl"
106 				eval "have$i() { true; }"
107 				didnothing=false
108 			else
109 				stillneed="$stillneed $i"
110 			fi
111 		done
112 		# break cycle by setting the last library on the list
113 		# to have no dependencies
114 		if $didnothing
115 		then
116 			j="xxx"
117 			for i in $autolibs
118 			do
119 				j=$i
120 			done
121 			echo "dependency cycle: $autolibs; breaking with $j"
122 			eval "can$j() { true; }"
123 		fi
124 		autolibs="$stillneed"
125 	done
126 	if $verbose
127 	then
128 		echo "liborder $libsl"
129 	fi
130 	libsl="$libsl -l9"
131 
132 	if [ "x$needdraw" = xtrue ]
133 	then
134 		if [ "x$X11" = "x" ]
135 		then
136 			X11=/usr/X11R6
137 		fi
138 		libsl="$libsl -L$X11/lib -lX11"
139 	fi
140 fi
141 
142 extralibs="-lm"
143 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
144 case "$tag" in
145 *OpenBSD*)
146 	ld=gcc
147 	extralibs="$extralibs -lutil -lpthread"
148 	;;
149 *FreeBSD*)
150 	ld=gcc
151 	extralibs="$extralibs -lutil"
152 	case "`uname -r`" in
153 	[5-9].*)
154 		extralibs="$extralibs -lpthread"
155 		;;
156 	esac
157 	;;
158 *BSD*)
159 	ld=gcc
160 	extralibs="$extralibs -lutil"
161 	;;
162 *Linux*)
163 	ld=gcc
164 	extralibs="$extralibs -lutil"
165 	case "`uname -r`" in
166 	2.6.*)
167 		extralibs="$extralibs -lpthread"
168 		;;
169 	esac
170 	;;
171 *Darwin*)
172 	ld=gcc
173 	;;
174 *SunOS*)
175 	ld="${CC9:-cc} -g"
176 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
177 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
178 	for i in "$@"
179 	do
180 		case "$i" in
181 		-L*)
182 			s=`echo $i | sed 's/-L/-R/'`
183 			extralibs="$extralibs $s"
184 			;;
185 		esac
186 	done
187 	;;
188 *)
189 	echo do not know how to link on "$tag" 1>&2
190 	exit 1
191 esac
192 
193 if $verbose
194 then
195 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
196 fi
197 if ! $ld -L$PLAN9/lib "$@" $libsl $extralibs
198 then
199 	rm -f $target
200 	exit 1
201 fi
202 exit 0