Re: Inter-library dependencies

[Carlo Wood]

On Sun, Oct 22, 2000 at 10:51:12AM -0600, Wesley W. Terpstra wrote:
> All of what you have just described should already work under the newest 
> libtool.

I'll double check that it doesn't work with 1.3.5, then upgrade
libtool to the latest cvs version and check again.

First for 1.3.5 thus:

> Try getting the version out of cvs and seeing if that solves your
> problems. Also check that you are compiling with commands roughly like:
> 
> libtool c++ -Wall -O2 -g -c cwd.c -o cwd.lo

/bin/sh ./libtool --mode=compile g++ -DHAVE_CONFIG_H -I. -I- -I./include 
-I../libcw/src/libcwd/include -DDEBUG    -g -fno-exceptions -pipe -Wall 
-Woverloaded-virtual -Wundef -Wpointer-arith -Winline -Wwrite-strings -Werror 
-c ../libcw/src/libcwd/type_info.cc
which executes:
g++ -DHAVE_CONFIG_H -I. -I- -I./include -I../libcw/src/libcwd/include -DDEBUG 
-g -fno-exceptions -pipe -Wall -Woverloaded-virtual -Wundef -Wpointer-arith 
-Winline -Wwrite-strings -Werror -Wp,-MD,.deps/type_info.pp -c 
../libcw/src/libcwd/type_info.cc  -fPIC -DPIC -o type_info.lo

That seems correct.

> libtool c++ -Wall -O2 -g -rpath /usr/lib -o libcwd.la cwd.lo -ldl -lbfd

/bin/sh ./libtool --mode=link g++  -g -fno-exceptions -pipe -Wall 
-Woverloaded-virtual -Wundef -Wpointer-arith -Winline -Wwrite-strings -Werror  
-o libcwd.la -rpath /usr/local/lib -version-info 99:4:99 bfd.lo debug.lo 
debugdebugcheckpoint.lo debugmalloc.lo demangle.lo printcw.lo strerrno.lo 
type_info.lo utils/libutils.la -lbfd -liberty -ldl 
which executes:
gcc -shared  bfd.lo debug.lo debugdebugcheckpoint.lo debugmalloc.lo demangle.lo 
printcw.lo strerrno.lo type_info.lo -Wl,--whole-archive utils/.libs/libutils.al 
-Wl,--no-whole-archive  -lbfd -liberty -ldl -lc  -Wl,-soname -Wl,libcwd.so.0 -o 
.libs/libcwd.so.0.99.4

I am afraid that -liberty got linked in:

~/c++/libcw-objdir/.libs>nm libcwd.so.0.99.4 | grep xmalloc
00036a30 T xmalloc
00036a20 T xmalloc_set_program_name

while libiberty.a is a static library, not compiled with -fPIC.
This is bad.  For the rest it looks conceptually like your line.

> libtool c++ -Wall -O2 -g -c cw.c -o cw.lo

/bin/sh ./libtool --mode=compile g++  -I. -I- -I./include 
-I../../../libcw/src/libcw/include    -DDEBUG -g -fno-exceptions -pipe -Wall 
-Woverloaded-virtual -Wundef -Wpointer-arith -Winline -Wwrite-strings -Werror 
-c version.cc
which executes:
g++ -I. -I- -I./include -I../../../libcw/src/libcw/include -DDEBUG -g 
-fno-exceptions -pipe -Wall -Woverloaded-virtual -Wundef -Wpointer-arith 
-Winline -Wwrite-strings -Werror -Wp,-MD,.deps/version.pp -c version.cc  -fPIC 
-DPIC -o version.lo

This is equivalent with the above

> libtool c++ -Wall -O2 -g -rpath /usr/lib -o libcw.la cw.lo libcwd.la

/bin/sh ./libtool --mode=link g++  -DDEBUG -g -fno-exceptions -pipe -Wall 
-Woverloaded-virtual -Wundef -Wpointer-arith -Winline -Wwrite-strings -Werror  
-o libcw.la -rpath /usr/local/lib -version-info 0:0:0 version.lo 
crosslink/libcrosslink.la io/libio.la kernel/libkernel.la llists/libllists.la 
net/libnet.la ../libcwd/libcwd.la 
which executes:
libtool: link: error: cannot link shared libraries into libtool libraries

Duh.  Well, you said that it was supported in 1.4, not 1.3.5.

> c++ -Wall -O2 -g -c mytest.c -o mytest.o
> libtool c++ -Wall -O2 -g -o mytest mytest.o libcwd.la

Surely you mean: libtool c++ -Wall -O2 -g -o mytest mytest.o libcw.la
Note the libcwd.la -> libcw.la

> PS. I've moved my reply from 'libtool-patch' to 'libtool' b/c there is no
> patch under discussion.

Ok.

> Wesley W. Terpstra <address@hidden>
> Javien Canada Inc. - Linux Developer

Thanks, I'll follow up with the results under 1.4-to-be tomorrow.

-- 
Carlo Wood <address@hidden>                        -=- Jesus Loves you -=-