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 2>/dev/null |
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 	havesec() { false; }
101 
102 	# now find correct order
103 	libsl=""
104 	while [ "x$autolibs" != x ]
105 	do
106 		stillneed=""
107 		didnothing=true
108 		for i in $autolibs
109 		do
110 			if eval "can$i"
111 			then
112 				libsl="-l$i $libsl"
113 				eval "have$i() { true; }"
114 				didnothing=false
115 			else
116 				stillneed="$stillneed $i"
117 			fi
118 		done
119 		# break cycle by setting the last library on the list
120 		# to have no dependencies
121 		if $didnothing
122 		then
123 			j="xxx"
124 			for i in $autolibs
125 			do
126 				j=$i
127 			done
128 			echo "dependency cycle: $autolibs; breaking with $j"
129 			eval "can$j() { true; }"
130 		fi
131 		autolibs="$stillneed"
132 	done
133 	if $verbose
134 	then
135 		echo "liborder $libsl"
136 	fi
137 	libsl="$libsl -l9"
138 
139 	# cycle: lib9 expects p9main, which is defined in libthread.  oops.
140 	if havethread
141 	then
142 		libsl="$libsl -lthread -l9"
143 	fi
144 
145 	# cycle: lib9 netcrypt uses libsec
146 	if havesec
147 	then
148 		libsl="$libsl -lsec -l9"
149 	fi
150 
151 	if [ "x$needdraw" = xtrue ]
152 	then
153 		if [ "x$X11" = "x" ]
154 		then
155 			X11=/usr/X11R6
156 		fi
157 		# x86_64 seems to put its 64-bit libraries in lib64.
158 		if [ "${OBJTYPE:-`uname -m`}" = "x86_64" ]
159 		then
160 			libsl="$libsl -L$X11/lib64"
161 		fi
162 		libsl="$libsl -L$X11/lib -lX11"
163 	fi
164 fi
165 
166 extralibs="-lm"
167 tag="${SYSNAME:-`uname`}-${OBJTYPE:-`uname -m`}"
168 case "$tag" in
169 *OpenBSD*)
170 	ld=gcc
171 	userpath=true
172 	extralibs="$extralibs -lutil"
173 	;;
174 *FreeBSD*)
175 	ld=gcc
176 	userpath=true
177 	extralibs="$extralibs -lutil"
178 	case "`uname -r`" in
179 	5.2.*)
180 		extralibs="$extralibs -lkse"
181 		;;
182 	[5-9].*)
183 		extralibs="$extralibs -lpthread"
184 		;;
185 	esac
186 	;;
187 *BSD*)
188 	ld=gcc
189 	userpath=true
190 	extralibs="$extralibs -lutil"
191 	;;
192 *Linux*)
193 	ld=gcc
194 	userpath=true
195 	extralibs="$extralibs -lutil"
196 	case "${SYSVERSION:-`uname -r`}" in
197 	2.6.*)
198 		extralibs="$extralibs -lpthread"
199 		;;
200 	esac
201 	;;
202 *Darwin*)
203 	ld=gcc
204 	;;
205 *SunOS*)
206 	ld="${CC9:-cc} -g"
207 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
208 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
209 	for i in "$libsl $@"
210 	do
211 		case "$i" in
212 		-L*)
213 			s=`echo $i | sed 's/-L/-R/'`
214 			extralibs="$extralibs $s"
215 			;;
216 		esac
217 	done
218 	case "${SYSVERSION:-`uname -r`}" in
219 	5.[67])
220 		echo do not know how to link right thread library on "$tag" 1>&2
221 		;;
222 	5.8)
223 		# Some trickery is needed to force use of
224 		# alternate thread lib from /usr/lib/lwp
225 		# Likely, this only works with sun cc,
226 		# for other compiler/loader we would need other flags.
227 		ld="$ld -i"
228 		extralibs="$extralibs /usr/lib/lwp/libthread.so -R/usr/lib/lwp:/usr/lib"
229 		;;
230 	esac
231 	;;
232 *)
233 	echo do not know how to link on "$tag" 1>&2
234 	exit 1
235 esac
236 
237 case "$userpath" in
238 true)
239 	for i in "$libsl $@"
240 	do
241 		case "$i" in
242 		-L*)
243 			s=`echo $i | sed 's/-L/-Wl,-rpath,/'`
244 			extralibs="$extralibs $s"
245 			;;
246 		esac
247 	done
248 	;;
249 esac
250 
251 if $verbose
252 then
253 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
254 fi
255 
256 xtmp=/tmp/9l.$$.$USER.out
257 xxout() {
258 	egrep -v ': In function `' $xtmp
259 	rm -f $xtmp
260 }
261 
262 if $ld -L$PLAN9/lib "$@" $libsl $extralibs >$xtmp 2>&1
263 then
264 	xxout
265 	exit 0
266 else
267 	xxout
268 	rm -f $target
269 	exit 1
270 fi
271