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 		*.[ao])
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 			# can't trust the libraries about using
62 			# libthread - we might not be linking with
63 			# those object files.
64 			a=`
65 				nm $PLAN9/lib/lib$i.a |
66 				grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
67 				sed 's/.*__p9l_autolib_//' |
68 				sort -u |
69 				grep -v thread
70 			`
71 			okayfn="true"
72 			for j in $a
73 			do
74 				if eval "[ x\$need$j = x ]"
75 				then
76 					autolibs="$autolibs $j"
77 					workq="$workq $j"
78 					eval "need$j=true"
79 				fi
80 				if [ $j != $i ]
81 				then
82 					okayfn="$okayfn && have$j"
83 				fi
84 			done
85 			# echo "can$i: $okayfn"
86 			eval "can$i() { $okayfn; }"
87 		done
88 	done
89 	if $verbose
90 	then
91 		echo "autolibs $autolibs"
92 	fi
93 
94 	for i in $autolibs
95 	do
96 		eval "have$i() { false; }"
97 	done
98 	havethread() { false; }
99 
100 	# now find correct order
101 	libsl=""
102 	while [ "x$autolibs" != x ]
103 	do
104 		stillneed=""
105 		didnothing=true
106 		for i in $autolibs
107 		do
108 			if eval "can$i"
109 			then
110 				libsl="-l$i $libsl"
111 				eval "have$i() { true; }"
112 				didnothing=false
113 			else
114 				stillneed="$stillneed $i"
115 			fi
116 		done
117 		# break cycle by setting the last library on the list
118 		# to have no dependencies
119 		if $didnothing
120 		then
121 			j="xxx"
122 			for i in $autolibs
123 			do
124 				j=$i
125 			done
126 			echo "dependency cycle: $autolibs; breaking with $j"
127 			eval "can$j() { true; }"
128 		fi
129 		autolibs="$stillneed"
130 	done
131 	if $verbose
132 	then
133 		echo "liborder $libsl"
134 	fi
135 	libsl="$libsl -l9"
136 
137 	# cycle: lib9 expects p9main, which is defined in libthread.  oops.
138 	if havethread
139 	then
140 		libsl="$libsl -lthread -l9"
141 	fi
142 
143 	if [ "x$needdraw" = xtrue ]
144 	then
145 		if [ "x$X11" = "x" ]
146 		then
147 			X11=/usr/X11R6
148 		fi
149 		libsl="$libsl -L$X11/lib -lX11"
150 	fi
151 fi
152 
153 extralibs="-lm"
154 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
155 case "$tag" in
156 *OpenBSD*)
157 	ld=gcc
158 	extralibs="$extralibs -lutil -lpthread"
159 	;;
160 *FreeBSD*)
161 	ld=gcc
162 	extralibs="$extralibs -lutil"
163 	case "`uname -r`" in
164 	[5-9].*)
165 		extralibs="$extralibs -lpthread"
166 		;;
167 	esac
168 	;;
169 *BSD*)
170 	ld=gcc
171 	extralibs="$extralibs -lutil"
172 	;;
173 *Linux*)
174 	ld=gcc
175 	extralibs="$extralibs -lutil"
176 	case "`uname -r`" in
177 	2.6.*)
178 		extralibs="$extralibs -lpthread"
179 		;;
180 	esac
181 	;;
182 *Darwin*)
183 	ld=gcc
184 	;;
185 *SunOS*)
186 	ld="${CC9:-cc} -g"
187 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
188 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
189 	for i in "$@"
190 	do
191 		case "$i" in
192 		-L*)
193 			s=`echo $i | sed 's/-L/-R/'`
194 			extralibs="$extralibs $s"
195 			;;
196 		esac
197 	done
198 	;;
199 *)
200 	echo do not know how to link on "$tag" 1>&2
201 	exit 1
202 esac
203 
204 if $verbose
205 then
206 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
207 fi
208 if $ld -L$PLAN9/lib "$@" $libsl $extralibs
209 then
210 	exit 0
211 else
212 	rm -f $target
213 	exit 1
214 fi
215