undefined reference to symbol 'pthread_rwlock_wrlock@@GLIBC_2.2.5'

[Duy Huynh]

hi there,

caffe was working fine for me on ubuntu 12.04.  i did an upgrade to ubuntu 14.04 today.  i just tried to 'make all' to rebuild the code, and got this error.  does anyone know how to fix this issue?

thanks!
dh

/usr/bin/g++-4.6 .build_release/examples/mnist/convert_mnist_data.o .build_release/lib/libcaffe.a -o .build_release/examples/mnist/convert_mnist_data.bin -fPIC -DNDEBUG -O2 -I/usr/include/python2.7 -I/usr/lib/python2.7/dist-packages/numpy/core/include -I/usr/local/include -I.build_release/src -I./src -I./include -I/usr/local/cuda/include -Wall -Wno-sign-compare -L/usr/lib -L/usr/local/lib -L/usr/lib -L/usr/local/cuda/lib64 -L/usr/local/cuda/lib -lcudart -lcublas -lcurand -lpthread -lglog -lgflags -lprotobuf -lleveldb -lsnappy -llmdb -lboost_system -lhdf5_hl -lhdf5 -lopencv_core -lopencv_highgui -lopencv_imgproc -lboost_thread -lcblas -latlas

/usr/bin/ld: /usr/local/lib/libgflags.a(gflags.cc.o): undefined reference to symbol 'pthread_rwlock_wrlock@@GLIBC_2.2.5'

/lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from command line

collect2: ld returned 1 exit status

make: *** [.build_release/examples/mnist/convert_mnist_data.bin] Error 1

[Cliff Woolley]

Just rebuild your libgflags with your new Ubuntu version's gcc (and glibc, by extension), and the error should go away.

--
You received this message because you are subscribed to the Google Groups "Caffe Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email to caffe-users...@googlegroups.com.
To post to this group, send email to caffe...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/caffe-users/5734d038-30da-43f2-bb78-8fe628500561%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Bernardino Romera Paredes]

Hi, I have the same problem after doing an update. I have rebuilt the libflags but still got the same error.
Thanks.

[Duy Huynh]

hey bernrdio, i finally got it working.  i just removed all the built files and did a fresh build again. 

[Bernardino Romera Paredes]

I did that as well, but it does not work for me, I still got the same error.

[kv]

Hi,
I encountered the same problem, and I referred to this http://stackoverflow.com/questions/19901934/strange-linking-error-dso-missing-from-command-line.
Just change the order of -lpthread and work.

[Bernardino Romera Paredes]

That works, thanks!

[andy nu]

Hi Bernardino,

I'm experiencing this error too, but I'm afraid I'm not following how to apply the suggestion from stack overflow to the caffe/Makefile. Could you share what you changed?

Thanks

[Bernardino Romera Paredes]

Hi Andy,

What I did was to edit the Makefile to change the order of LIBRARIES (line 168), so that pthread now appears at the end rather than at the beginning:

LIBRARIES += glog gflags protobuf leveldb snappy \
    lmdb \
    boost_system \
    hdf5_hl hdf5 \
    opencv_core opencv_highgui opencv_imgproc \
    pthread

Hope it works for you.

[andy nu]

Wonderful!  That worked. Thank you for the details.