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 	havethread() { false; }
95 
96 	# now find correct order
97 	libsl=""
98 	while [ "x$autolibs" != x ]
99 	do
100 		stillneed=""
101 		didnothing=true
102 		for i in $autolibs
103 		do
104 			if eval "can$i"
105 			then
106 				libsl="-l$i $libsl"
107 				eval "have$i() { true; }"
108 				didnothing=false
109 			else
110 				stillneed="$stillneed $i"
111 			fi
112 		done
113 		# break cycle by setting the last library on the list
114 		# to have no dependencies
115 		if $didnothing
116 		then
117 			j="xxx"
118 			for i in $autolibs
119 			do
120 				j=$i
121 			done
122 			echo "dependency cycle: $autolibs; breaking with $j"
123 			eval "can$j() { true; }"
124 		fi
125 		autolibs="$stillneed"
126 	done
127 	if $verbose
128 	then
129 		echo "liborder $libsl"
130 	fi
131 	libsl="$libsl -l9"
132 
133 	# cycle: lib9 expects p9main, which is defined in libthread.  oops.
134 	if $havethread
135 	then
136 		libsl="$libsl -lthread"
137 	fi
138 
139 	if [ "x$needdraw" = xtrue ]
140 	then
141 		if [ "x$X11" = "x" ]
142 		then
143 			X11=/usr/X11R6
144 		fi
145 		libsl="$libsl -L$X11/lib -lX11"
146 	fi
147 fi
148 
149 extralibs="-lm"
150 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
151 case "$tag" in
152 *OpenBSD*)
153 	ld=gcc
154 	extralibs="$extralibs -lutil -lpthread"
155 	;;
156 *FreeBSD*)
157 	ld=gcc
158 	extralibs="$extralibs -lutil"
159 	case "`uname -r`" in
160 	[5-9].*)
161 		extralibs="$extralibs -lpthread"
162 		;;
163 	esac
164 	;;
165 *BSD*)
166 	ld=gcc
167 	extralibs="$extralibs -lutil"
168 	;;
169 *Linux*)
170 	ld=gcc
171 	extralibs="$extralibs -lutil"
172 	case "`uname -r`" in
173 	2.6.*)
174 		extralibs="$extralibs -lpthread"
175 		;;
176 	esac
177 	;;
178 *Darwin*)
179 	ld=gcc
180 	;;
181 *SunOS*)
182 	ld="${CC9:-cc} -g"
183 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
184 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
185 	for i in "$@"
186 	do
187 		case "$i" in
188 		-L*)
189 			s=`echo $i | sed 's/-L/-R/'`
190 			extralibs="$extralibs $s"
191 			;;
192 		esac
193 	done
194 	;;
195 *)
196 	echo do not know how to link on "$tag" 1>&2
197 	exit 1
198 esac
199 
200 if $verbose
201 then
202 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
203 fi
204 if $ld -L$PLAN9/lib "$@" $libsl $extralibs
205 then
206 	exit 0
207 else
208 	rm -f $target
209 	exit 1
210 fi
211