1 #!/bin/sh
2 
3 test -f $PLAN9/config && . $PLAN9/config
4 libsl=""
5 
6 doautolib=true
7 verbose=false
8 
9 if [ "x$1" = "x-l" ]
10 then
11 	shift
12 	doautolib=false
13 elif [ "x$1" = "x-v" ]
14 then
15 	shift
16 	verbose=true
17 fi
18 
19 target=a.out
20 if [ "x$1" = "x-o" ]
21 then
22 	target=$2
23 fi
24 
25 if $doautolib
26 then
27 	ofiles=""
28 	for i
29 	do
30 		case "$i" in
31 		*.[ao])
32 			ofiles="$ofiles $i"
33 			;;
34 		esac
35 	done
36 	
37 	# echo "ofiles $ofiles"
38 	autolibs=""
39 	if [ "x$ofiles" != "x" ]
40 	then
41 		a=`
42 			nm $ofiles |
43 			grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
44 			sed 's/.*__p9l_autolib_//' |
45 			sort -u
46 		`
47 		for i in $a
48 		do
49 			autolibs="$autolibs $i"
50 			eval "need$i=true"
51 		done
52 	fi
53 
54 	# fetch dependencies out of libraries
55 	workq="$autolibs"
56 	while [ "x$workq" != "x" ]
57 	do
58 		w="$workq"
59 		workq=""
60 		for i in $w
61 		do
62 			# can't trust the libraries about using
63 			# libthread - we might not be linking with
64 			# those object files.
65 			a=`
66 				nm $PLAN9/lib/lib$i.a |
67 				grep '__p9l_autolib_[a-zA-Z0-9+-]*$' |
68 				sed 's/.*__p9l_autolib_//' |
69 				sort -u |
70 				grep -v thread
71 			`
72 			okayfn="true"
73 			for j in $a
74 			do
75 				if eval "[ x\$need$j = x ]"
76 				then
77 					autolibs="$autolibs $j"
78 					workq="$workq $j"
79 					eval "need$j=true"
80 				fi
81 				if [ $j != $i ]
82 				then
83 					okayfn="$okayfn && have$j"
84 				fi
85 			done
86 			# echo "can$i: $okayfn"
87 			eval "can$i() { $okayfn; }"
88 		done
89 	done
90 	if $verbose
91 	then
92 		echo "autolibs $autolibs"
93 	fi
94 
95 	for i in $autolibs
96 	do
97 		eval "have$i() { false; }"
98 	done
99 	havethread() { false; }
100 
101 	# now find correct order
102 	libsl=""
103 	while [ "x$autolibs" != x ]
104 	do
105 		stillneed=""
106 		didnothing=true
107 		for i in $autolibs
108 		do
109 			if eval "can$i"
110 			then
111 				libsl="-l$i $libsl"
112 				eval "have$i() { true; }"
113 				didnothing=false
114 			else
115 				stillneed="$stillneed $i"
116 			fi
117 		done
118 		# break cycle by setting the last library on the list
119 		# to have no dependencies
120 		if $didnothing
121 		then
122 			j="xxx"
123 			for i in $autolibs
124 			do
125 				j=$i
126 			done
127 			echo "dependency cycle: $autolibs; breaking with $j"
128 			eval "can$j() { true; }"
129 		fi
130 		autolibs="$stillneed"
131 	done
132 	if $verbose
133 	then
134 		echo "liborder $libsl"
135 	fi
136 	libsl="$libsl -l9"
137 
138 	# cycle: lib9 expects p9main, which is defined in libthread.  oops.
139 	if havethread
140 	then
141 		libsl="$libsl -lthread -l9"
142 	fi
143 
144 	if [ "x$needdraw" = xtrue ]
145 	then
146 		if [ "x$X11" = "x" ]
147 		then
148 			X11=/usr/X11R6
149 		fi
150 		libsl="$libsl -L$X11/lib -lX11"
151 	fi
152 fi
153 
154 extralibs="-lm"
155 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
156 case "$tag" in
157 *OpenBSD*)
158 	ld=gcc
159 	extralibs="$extralibs -lutil -lpthread"
160 	;;
161 *FreeBSD*)
162 	ld=gcc
163 	extralibs="$extralibs -lutil"
164 	case "`uname -r`" in
165 	[5-9].*)
166 		extralibs="$extralibs -lpthread"
167 		;;
168 	esac
169 	;;
170 *BSD*)
171 	ld=gcc
172 	extralibs="$extralibs -lutil"
173 	;;
174 *Linux*)
175 	ld=gcc
176 	extralibs="$extralibs -lutil"
177 	case "${SYSVERSION:-`uname -r`}" in
178 	2.6.*)
179 		extralibs="$extralibs -lpthread"
180 		;;
181 	esac
182 	;;
183 *Darwin*)
184 	ld=gcc
185 	;;
186 *SunOS*)
187 	ld="${CC9:-cc} -g"
188 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
189 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
190 	for i in "$libsl $@"
191 	do
192 		case "$i" in
193 		-L*)
194 			s=`echo $i | sed 's/-L/-R/'`
195 			extralibs="$extralibs $s"
196 			;;
197 		esac
198 	done
199 	;;
200 *)
201 	echo do not know how to link on "$tag" 1>&2
202 	exit 1
203 esac
204 
205 case "$ld" in
206 gcc)
207 	for i in "$libsl $@"
208 	do
209 		case "$i" in
210 		-L*)
211 			s=`echo $i | sed 's/-L/-Wl,-rpath,/'`
212 			extralibs="$extralibs $s"
213 			;;
214 		esac
215 	done
216 	;;
217 esac
218 
219 if $verbose
220 then
221 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
222 fi
223 if $ld -L$PLAN9/lib "$@" $libsl $extralibs
224 then
225 	exit 0
226 else
227 	rm -f $target
228 	exit 1
229 fi
230