Relinking problem

[Nick Hudson]

The problem I mentioned a week or so ago with relinking is caused by the 
following situation:

$ mkdir tmp
$ cd tmp
$ mkdir inst
$ touch dummy.c
$
$ libtool --mode=compile cc -o dummy.o -c dummy.c
mkdir .libs
 cc -c dummy.c  -fPIC -DPIC -o .libs/dummy.o
 cc -c dummy.c -o dummy.o >/dev/null 2>&1
$
$ 
$ libtool --mode=link cc -o libl1.la dummy.lo -rpath $(pwd)/inst/
cc -shared  .libs/dummy.o   -Wl,-soname -Wl,libl1.so.0 -o .libs/libl1.so.0.0
(cd .libs && rm -f libl1.so.0 && ln -s libl1.so.0.0 libl1.so.0)
(cd .libs && rm -f libl1.so && ln -s libl1.so.0.0 libl1.so)
(cd .libs && rm -f libl1.so && ln -s libl1.so.0.0 libl1.so)
ar cru .libs/libl1.a  dummy.o
ranlib .libs/libl1.a
creating libl1.la
(cd .libs && rm -f libl1.la && ln -s ../libl1.la libl1.la)
$
$ # XXX Note trailing '/'
$ libtool --mode=link cc -o libl2.la dummy.lo libl1.la -rpath $(pwd)/inst/
cc -shared  .libs/dummy.o  -Wl,--rpath -Wl,/home/nick/tmp/.libs -Wl,--rpath 
-Wl,/home/nick/tmp/inst/ ./.libs/libl1.so  -Wl,-soname -Wl,libl2.so.0 -o 
.libs/libl2.so.0.0
(cd .libs && rm -f libl2.so.0 && ln -s libl2.so.0.0 libl2.so.0)
(cd .libs && rm -f libl2.so && ln -s libl2.so.0.0 libl2.so)
(cd .libs && rm -f libl2.so && ln -s libl2.so.0.0 libl2.so)
ar cru .libs/libl2.a  dummy.o
ranlib .libs/libl2.a
creating libl2.la
(cd .libs && rm -f libl2.la && ln -s ../libl2.la libl2.la)
$
$
$
$ libtool --mode=install install libl1.la  $(pwd)/inst
install .libs/libl1.so.0.0 /home/nick/tmp/inst/libl1.so.0.0
(cd /home/nick/tmp/inst && rm -f libl1.so.0 && ln -s libl1.so.0.0 libl1.so.0)
(cd /home/nick/tmp/inst && rm -f libl1.so && ln -s libl1.so.0.0 libl1.so)
(cd /home/nick/tmp/inst && rm -f libl1.so && ln -s libl1.so.0.0 libl1.so)
install .libs/libl1.lai /home/nick/tmp/inst/libl1.la
install .libs/libl1.a /home/nick/tmp/inst/libl1.a
ranlib /home/nick/tmp/inst/libl1.a
chmod 644 /home/nick/tmp/inst/libl1.a
libtool: install: warning: remember to run `libtool --finish 
/home/nick/tmp/inst/'
$
$ # XXX note no trailing '/'
$ libtool --mode=install install libl2.la  $(pwd)/inst
libtool: install: error: cannot install `libl2.la' to a directory not ending in 
/home/nick/tmp/inst/
$

The pathname passed with the rpath argument has to match the install
pathname. This is easily broken with a trailing '/' mismatch or any non-
canonical pathname.

If anyone has any bright ideas on a solution I'd be grateful. My first
thought was to do the

        absdir=`cd "$dir" && pwd`

dance for both pathnames, but I'm not sure they are guaranteed to exist.

Nick