make runtest fails: symbol lookup error

[Jeff chen]

I am struggling to install caffe. Everything went well, until "make runtest". It seems other tests are OK, until:

[ RUN      ] ConcatLayerTest/0.TestNum

[       OK ] ConcatLayerTest/0.TestNum (0 ms)

[----------] 4 tests from ConcatLayerTest/0 (2 ms total)

[----------] 4 tests from ImageDataLayerTest/1, where TypeParam = caffe::DoubleCPU

[ RUN      ] ImageDataLayerTest/1.TestRead

.build_release/test/test_all.testbin: symbol lookup error: .build_release/test/test_all.testbin: undefined symbol: _ZN6google10LogMessage6streamEv

make: *** [runtest] Error 127

The error is probably related to glog and gflags library. I tried to ignore this error and compiled matlab interface. When I call the interface, similar error happens again:

Invalid MEX-file '/home/jeff/Downloads/caffe-rc2/matlab/caffe/caffe.mexa64':

/home/jeff/Downloads/caffe-rc2/matlab/caffe/caffe.mexa64: undefined symbol:

_ZN6google4base21CheckOpMessageBuilder7ForVar2Ev

Error in matcaffe_init (line 19)

if caffe('is_initialized') == 0

My system is Linux mint 17.1. I intially install glogs and gflags using package manager. Later I also tried to reinstall glogs and gflags from source without solving the above problems.

Thanks.

[Jeff chen]

It turns out there are other versions of glog and gflags in my system. I adjusted the LD_LIBRARY_PATH and the problem is resolved. A helpful command is "ldd -d -r your_program" that will lists the paths of the libraries called by your program.

[JP]

You need to include the directory of your library for glog, gflags and protobuf. For me the libraries were in `/usr/local/lib` and after exporting the `LD_LIBRARY_PATH`:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib:/usr/local/cuda/lib64

I could run make all, test, runtest without any problems :)