undefined reference when linking against libresolv - c++

Question

I have a project that is a library that links against libresolv,
It works fine on recent distros: Ubuntu 10.x Fedora 13, Mandriva
2010.1 but on Centos 5.x I get the following errors
glibc installed is: glibc-2.5-18.el5_1.1
g++ -DHAVE_CONFIG_H -I. -I./include -I/usr/include/postgresql -O3
-ansi -Wall -Wno-deprecated -D_FORTIFY_SOURCE=0 -MT testUpLog.o -MD
-MP -MF .deps/testUpLog.Tpo -c -o testUpLog.o testUpLog.cc
mv -f .deps/testUpLog.Tpo .deps/testUpLog.Po
/bin/sh ./libtool --tag=CXX --mode=link g++ -O3 -ansi -Wall
-Wno-deprecated -D_FORTIFY_SOURCE=0 -L/usr/lib64 -L/lib64
-L/usr/lib64/mysql -o testUpLog testUpLog.o libUpTools.la -lpq
-lmysqlclient -lssl -lpthread
libtool: link: g++ -O3 -ansi -Wall -Wno-deprecated -D_FORTIFY_SOURCE=0
-o .libs/testUpLog testUpLog.o -L/usr/lib64 -L/lib64
-L/usr/lib64/mysql ./.libs/libUpTools.so -lpq -lmysqlclient -lssl
-lpthread
./.libs/libUpTools.so: undefined reference to `__ns_name_uncompress'
./.libs/libUpTools.so: undefined reference to `__ns_initparse'
./.libs/libUpTools.so: undefined reference to `__ns_parserr'
collect2: ld returned 1 exit status
make[1]: *** [testUpLog] Error 1
make[1]: Leaving directory `/tmp/UpTools-8.5.3'
make: *** [check-am] Error 2
library.la file contains:
dlname='libUpTools.so.0'
library_names='libUpTools.so.0.0.0 libUpTools.so.0 libUpTools.so'
old_library='libUpTools.a'
inherited_linker_flags=''
dependency_libs=' -L/usr/lib64 -L/lib64 -L/usr/lib64/mysql -lpq
-lmysqlclient -lssl -lpthread'
weak_library_names=''
current=0
age=0
revision=0
installed=no
shouldnotlink=no
dlopen=''
dlpreopen=''
libdir='/usr/lib'
You can read configure.ac on
http://pastebin.com/hs5q21Rq
Thanks in advance

Answer 1

If libUpTools uses functions lib libresolv, you need to say so:
libUpTools_la_LIBADD = -lresolv (of course -lresolv may be replaced by variables determined by configure etc.)
That way, -lresolv will end up in the .la file and also in the .so file (if you chose to build it) that you can run ldd on for verification.