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$X11" = "x" ]
147 		then
148 			X11=/usr/X11R6
149 		fi
150 		# x86_64 seems to put its 64-bit libraries in lib64.
151 		if [ "${OBJTYPE:-`uname -m`}" = "x86_64" ]
152 		then
153 			libsl="$libsl -L$X11/lib64"
154 		fi
155 		libsl="$libsl -L$X11/lib -lX11"
156 	fi
157 fi
158 
159 extralibs="-lm"
160 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
161 case "$tag" in
162 *OpenBSD*)
163 	ld=gcc
164 	userpath=true
165 	extralibs="$extralibs -lutil -lpthread"
166 	;;
167 *FreeBSD*)
168 	ld=gcc
169 	userpath=true
170 	extralibs="$extralibs -lutil"
171 	case "`uname -r`" in
172 	5.2.*)
173 		extralibs="$extralibs -lkse"
174 		;;
175 	[5-9].*)
176 		extralibs="$extralibs -lpthread"
177 		;;
178 	esac
179 	;;
180 *BSD*)
181 	ld=gcc
182 	userpath=true
183 	extralibs="$extralibs -lutil"
184 	;;
185 *Linux*)
186 	ld=gcc
187 	userpath=true
188 	extralibs="$extralibs -lutil"
189 	case "${SYSVERSION:-`uname -r`}" in
190 	2.6.*)
191 		extralibs="$extralibs -lpthread"
192 		;;
193 	esac
194 	;;
195 *Darwin*)
196 	ld=gcc
197 	;;
198 *SunOS*)
199 	ld="${CC9:-cc} -g"
200 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
201 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
202 	for i in "$libsl $@"
203 	do
204 		case "$i" in
205 		-L*)
206 			s=`echo $i | sed 's/-L/-R/'`
207 			extralibs="$extralibs $s"
208 			;;
209 		esac
210 	done
211 	case "${SYSVERSION:-`uname -r`}" in
212 	5.[67])
213 		echo do not know how to link right thread library on "$tag" 1>&2
214 		;;
215 	5.8)
216 		# Some trickery is needed to force use of
217 		# alternate thread lib from /usr/lib/lwp
218 		# Likely, this only works with sun cc,
219 		# for other compiler/loader we would need other flags.
220 		ld="$ld -i"
221 		extralibs="$extralibs /usr/lib/lwp/libthread.so -R/usr/lib/lwp:/usr/lib"
222 		;;
223 	esac
224 	;;
225 *)
226 	echo do not know how to link on "$tag" 1>&2
227 	exit 1
228 esac
229 
230 case "$userpath" in
231 true)
232 	for i in "$libsl $@"
233 	do
234 		case "$i" in
235 		-L*)
236 			s=`echo $i | sed 's/-L/-Wl,-rpath,/'`
237 			extralibs="$extralibs $s"
238 			;;
239 		esac
240 	done
241 	;;
242 esac
243 
244 if $verbose
245 then
246 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
247 fi
248 if $ld -L$PLAN9/lib "$@" $libsl $extralibs
249 then
250 	exit 0
251 else
252 	rm -f $target
253 	exit 1
254 fi
255