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 *FreeBSD*)
170 	ld=gcc
171 	userpath=true
172 	extralibs="$extralibs -lutil"
173 	case "`uname -r`" in
174 	5.2.*)
175 		extralibs="$extralibs -lkse"
176 		;;
177 	[5-9].*)
178 		extralibs="$extralibs -lpthread"
179 		;;
180 	esac
181 	;;
182 *BSD*)
183 	ld=gcc
184 	userpath=true
185 	extralibs="$extralibs -lutil"
186 	;;
187 *Linux*)
188 	ld=gcc
189 	userpath=true
190 	extralibs="$extralibs -lutil"
191 	case "${SYSVERSION:-`uname -r`}" in
192 	2.6.*)
193 		extralibs="$extralibs -lpthread"
194 		;;
195 	esac
196 	;;
197 *Darwin*)
198 	ld=gcc
199 	;;
200 *SunOS*)
201 	ld="${CC9:-cc} -g"
202 	extralibs="$extralibs -lrt -lpthread -lsocket -lnsl"
203 	# Record paths to shared libraries to avoid needing LD_LIBRARY_PATH 
204 	for i in "$libsl $@"
205 	do
206 		case "$i" in
207 		-L*)
208 			s=`echo $i | sed 's/-L/-R/'`
209 			extralibs="$extralibs $s"
210 			;;
211 		esac
212 	done
213 	case "${SYSVERSION:-`uname -r`}" in
214 	5.[67])
215 		echo do not know how to link right thread library on "$tag" 1>&2
216 		;;
217 	5.8)
218 		# Some trickery is needed to force use of
219 		# alternate thread lib from /usr/lib/lwp
220 		# Likely, this only works with sun cc,
221 		# for other compiler/loader we would need other flags.
222 		ld="$ld -i"
223 		extralibs="$extralibs /usr/lib/lwp/libthread.so -R/usr/lib/lwp:/usr/lib"
224 		;;
225 	esac
226 	;;
227 *)
228 	echo do not know how to link on "$tag" 1>&2
229 	exit 1
230 esac
231 
232 case "$userpath" in
233 true)
234 	for i in "$libsl $@"
235 	do
236 		case "$i" in
237 		-L*)
238 			s=`echo $i | sed 's/-L/-Wl,-rpath,/'`
239 			extralibs="$extralibs $s"
240 			;;
241 		esac
242 	done
243 	;;
244 esac
245 
246 if $verbose
247 then
248 	echo $ld -L$PLAN9/lib "$@" $libsl $extralibs
249 fi
250 
251 xtmp=/tmp/9l.$$.$USER.out
252 xxout() {
253 	egrep -v ': In function `' $xtmp
254 	rm -f $xtmp
255 }
256 
257 if $ld -L$PLAN9/lib "$@" $libsl $extralibs >$xtmp 2>&1
258 then
259 	xxout
260 	exit 0
261 else
262 	xxout
263 	rm -f $target
264 	exit 1
265 fi
266