libtool chooses the wrong library version to link against

[Andreas Metzler]

Hello,

this is about <http://bugs.debian.org/453035>.

when I am building gnutls on a system with a different version of
gnutls already installed, libtool links the library libgnutls-extra
against /usr/lib/libgnutls.so instead of against the correct new
version DESTDIR/usr/lib/libgnutls.so.

The actual breakage does not happen at build time but at
install time - ../lib/libgnutls.la is translated into -lgnutls:
-----------------------------
libtool: install: warning: relinking `libgnutls-extra.la'
(cd /tmp/GNUTLS/gnutls25-2.1.6/libextra; /bin/bash ../libtool  --tag=CC 
--mode=relink cc -std=gnu99 -g -Wall -O2 -D_REENTRANT -D_THREAD_SAFE -pipe -g 
-Wall -O2 -D_REENTRANT -D_THREAD_SAFE -Wno-pointer-sign -no-undefined 
-L/usr/lib -lopencdk -L/usr/lib -lgcrypt -L/usr/lib -lgpg-error -L/usr/lib 
-lnsl -L/usr/lib -lz -version-info 25:1:0 -llzo2 
-Wl,--version-script=./libgnutls-extra.vers -o libgnutls-extra.la -rpath 
/usr/lib gnutls_extra.lo gnutls_openpgp.lo gnutls_ia.lo 
openpgp/libgnutls_openpgp.la ../lgl/liblgnu.la ../lib/libgnutls.la 
-inst-prefix-dir /tmp/GNUTLS/gnutls25-2.1.6/debian/tmp/)
cc -std=gnu99 -shared  .libs/gnutls_extra.o .libs/gnutls_openpgp.o 
.libs/gnutls_ia.o -Wl,--whole-archive openpgp/.libs/libgnutls_openpgp.a 
../lgl/.libs/liblgnu.a -Wl,--no-whole-archive  -L/usr/lib 
-L/tmp/GNUTLS/gnutls25-2.1.6/debian/tmp//usr/lib -lopencdk -lnsl -lz -llzo2 
-lgcrypt -lgpg-error -lgnutls  -Wl,--version-script=./libgnutls-extra.vers 
-Wl,-soname -Wl,libgnutls-extra.so.25 -o .libs/libgnutls-extra.so.25.0.1
-----------------------------

I think I can remember similar issues with software packages that
shipped a library and a binary linking against this library. (Although
I cannot find the correct reference on google.) This is a different
issue as it is about two depending libraries.

I /think/ the automake is correct:
gnutls25-2.1.6/libextra/Makefile.am

lib_LTLIBRARIES = libgnutls-extra.la
[...]
libgnutls_extra_la_LIBADD += ../lgl/liblgnu.la ../lib/libgnutls.la

This is libtool VERSION="1.5.22 Debian 1.5.22-4", btw. If you think
this is a Debian specific issue I will gladly take it there.

cu andreas
-- 
`What a good friend you are to him, Dr. Maturin. His other friends are
so grateful to you.'
`I sew his ears on from time to time, sure'