Caffe: OpenMP Linking Error

[sohamm17]

I'm using GCC 4.8.5
I've the following error when using make all:

[ 90%] Linking CXX executable upgrade_net_proto_text
//usr/lib/x86_64-linux-gnu/libsoxr.so.0: undefined reference to `GOMP_parallel@GOMP_4.0'
collect2: error: ld returned 1 exit status
tools/CMakeFiles/upgrade_net_proto_text.dir/build.make:131: recipe for target 'tools/upgrade_net_proto_text' failed
make[2]: *** [tools/upgrade_net_proto_text] Error 1

Is it an intel problem because I have an intel processor. However, I've not installed related to intel's openmp. I found the following intel post about gcc 4.9

[artBoffin]

Same issue here, using cmake following default instructions:

[ 81%] Linking CXX shared library ../../lib/libcaffe-nv.so
[ 81%] Built target caffe
Scanning dependencies of target test_net
[ 81%] Building CXX object tools/CMakeFiles/test_net.dir/test_net.cpp.o
[ 82%] Linking CXX executable test_net
[ 82%] Built target test_net
Scanning dependencies of target net_speed_benchmark
[ 83%] Building CXX object tools/CMakeFiles/net_speed_benchmark.dir/net_speed_benchmark.cpp.o
[ 83%] Linking CXX executable net_speed_benchmark
[ 83%] Built target net_speed_benchmark
Scanning dependencies of target finetune_net
[ 83%] Building CXX object tools/CMakeFiles/finetune_net.dir/finetune_net.cpp.o
[ 85%] Linking CXX executable finetune_net
[ 85%] Built target finetune_net
Scanning dependencies of target upgrade_net_proto_text
[ 85%] Building CXX object tools/CMakeFiles/upgrade_net_proto_text.dir/upgrade_net_proto_text.cpp.o
[ 86%] Linking CXX executable upgrade_net_proto_text
//usr/lib/x86_64-linux-gnu/libsoxr.so.0: undefined reference to `GOMP_parallel@GOMP_4.0'
collect2: error: ld returned 1 exit status
tools/CMakeFiles/upgrade_net_proto_text.dir/build.make:134: recipe for target 'tools/upgrade_net_proto_text' failed
make[2]: * [tools/upgrade_net_proto_text] Error 1
CMakeFiles/Makefile2:549: recipe for target 'tools/CMakeFiles/upgrade_net_proto_text.dir/all' failed
make[1]: [tools/CMakeFiles/upgrade_net_proto_text.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: ** [all] Error 2

[shelhamer]

Try the Makefile build instead—CMake can pull in weird dependencies.

[fbadaud]

hello , I faced exactly the same issue as artBoffin today and by adding -fopenmp to the line 50 for CMAKE_CXX_FLAGS of the CMakeLists.txt and then use the Cmake .. and make all , I finally succeeded in compiling (still without reference to anaconda installation).I hope it will help next user.

[juiceboxjoe]

@fbadaud

adding -fopenmp to the line 50 for CMAKE_CXX_FLAGS of the CMakeLists.txt and then use the Cmake .. and make all.

Worked like a charm!