Re: [Discuss-gnuradio] mblock linking error

[Tim Meehan]

Hi Johnathan

I think I am beginning to understand  now.  I am no expert with the gnu linker

when I run

$g++ -g -O2 -Wall -Woverloaded-virtual -o .libs/test_mblock
test_mblock.o  -pthread ./.libs/libmblock-qa.so  .libs/libmblock.so
-Wl,--rpath -Wl,/usr/local/lib

I do not get an error

NOTE the addition of .libs/libmblock.so to the g++ line

Also if I run

$g++ -g -O2 -Wall -Woverloaded-virtual -o .libs/test_mblock
test_mblock.o  -pthread ./.libs/libmblock-qa.so   -Wl

Note here I do not inlude .libs/libmblock.so but I remove the --rpath
-Wl,/usr/local/lib

I guess the `--rpath ....'  steps on whatever RPATH is in libmblock-qa.so


I have included the dumps you requested below.

I am rebuilding with /etc/ld.so.conf mod that Eric requested.

$ grep dependency libmblock-qa.la
dependency_libs='
/home/meehan/workspace/gnuradio/mblock/src/lib/libmblock.la
/home/meehan/workspace/gnuradio/omnithread/libgromnithread.la -lrt
/home/meehan/workspace/gnuradio/pmt/src/lib/libpmt.la
/usr/lib/gcc-lib/i486-linux/3.3.5/../../..//libcppunit.la -ldl '

$ objdump -x .libs/libmblock-qa.so | grep NEEDED
 NEEDED      libmblock.so
 NEEDED      libcppunit-1.10.so.0
 NEEDED      libdl.so.2
 NEEDED      libstdc++.so.5
 NEEDED      libm.so.6
 NEEDED      libc.so.6
 NEEDED      libgcc_s.so.1


$objdump -x .libs/libmblock-qa.so   | grep RPATH
 RPATH       /home/meehan/workspace/gnuradio/mblock/src/lib/.libs:/usr/local/lib

$ grep dependency libmblock.la
dependency_libs='
/home/meehan/workspace/gnuradio/omnithread/libgromnithread.la -lrt
/home/meehan/workspace/gnuradio/pmt/src/lib/libpmt.la  '

$ objdump -x .libs/libmblock.so | grep NEEDED
 NEEDED      libgromnithread.so
 NEEDED      libpmt.so
 NEEDED      libstdc++.so.5
 NEEDED      libm.so.6
 NEEDED      libc.so.6
 NEEDED      libgcc_s.so.1

$ objdump -x .libs/libmblock.so | grep RPATH
 RPATH       
/home/meehan/workspace/gnuradio/omnithread/.libs:/home/meehan/workspace/gnuradio/pmt/src/lib/.libs:/usr/local/lib


On 3/1/07, Johnathan Corgan <address@hidden> wrote:
> Tim Meehan wrote:
>
> > tim /etc/ld.so.conf
> >
> > /usr/X11R6/lib
> > /usr/lib/atlas
> >
> > /usr/lib/libc5-compat
> > /lib/libc5-compat
> > /usr/i486-linuxlibc1/lib
>
> Here is mine:
>
> /usr/local/lib
> /lib/i486-linux-gnu
> /usr/lib/i486-linux-gnu
> /usr/X11R6/lib
>
> I don't recall if the first line is something I added or if it is the
> stock configuration.
>
> > Some more possibly usefull infromation
> >
> > g++ -g -O2 -Wall -Woverloaded-virtual -o .libs/test_mblock
> > test_mblock.o  -pthread ./.libs/libmblock-qa.so -Wl,--rpath
> > -Wl,/usr/local/lib
>
> On my Ubuntu 6.10 system:
>
> g++ -g -O2 -Wall -Woverloaded-virtual -pthread -o .libs/test_mblock
> test_mblock.o  ./.libs/libmblock-qa.so
>
> This is the key difference, as I think was worked out by Bob McGwier
> some weeks ago--your libtool has the '-Wl,--rpath -Wl,/usr/local/lib'
> arguments appended, mine does not. I have 1.5.22-4.
>
> On my system, in the build tree, this results in:
>
> $ grep dependency libmblock-qa.la
>
> dependency_libs='
> /home/jcorgan/gnuradio/trunk/mblock/src/lib/libmblock.la
> /home/jcorgan/gnuradio/trunk/omnithread/libgromnithread.la -lrt
> /home/jcorgan/gnuradio/trunk/pmt/src/lib/libpmt.la
> /usr/lib/gcc/i486-linux-gnu/4.1.2/../../..//libcppunit.la -ldl '
>
> $ objdump -x libmblock-qa.so | grep NEEDED
>
>   NEEDED      libmblock.so
>   NEEDED      libcppunit-1.10.so.2
>   NEEDED      libdl.so.2
>   NEEDED      libstdc++.so.6
>   NEEDED      libm.so.6
>   NEEDED      libc.so.6
>   NEEDED      libgcc_s.so.1
>
> $ objdump -x libmblock-qa.so | grep RPATH
>
>   RPATH       /home/jcorgan/gnuradio/trunk/mblock/src/lib/.libs
>
> $ grep dependency libmblock.la
>
> dependency_libs='
> /home/jcorgan/gnuradio/trunk/omnithread/libgromnithread.la -lrt
> /home/jcorgan/gnuradio/trunk/pmt/src/lib/libpmt.la  '
>
> $ objdump -x libmblock.so | grep NEEDED
>
>   NEEDED      libgromnithread.so
>   NEEDED      libpmt.so
>   NEEDED      libstdc++.so.6
>   NEEDED      libm.so.6
>   NEEDED      libc.so.6
>   NEEDED      libgcc_s.so.1
>
> $ objdump -x libmblock.so | grep RPATH
>
>   RPATH
> /home/jcorgan/gnuradio/trunk/omnithread/.libs:/home/jcorgan/gnuradio/trunk/pmt/src/lib/.libs
>
>
> So the net of all this is that in the correctly completed build, both
> the .la files and the .so files have all the information needed to
> resolve all the interlibrary dependencies from within the build tree.
>
> Can you compare the above to what you see in your tree?
>
> --
> Johnathan Corgan
> Corgan Enterprises LLC
> http://corganenterprises.com