nccl2 needs libnccl_static.a but not found for ppc build

[pseudotensor]

http://mr-0xc1:8080/blue/organizations/jenkins/h2o4gpu-ppc64le-cuda9/detail/PR-665/3/pipeline

Scanning dependencies of target gpuxgboost

[ 95%] Linking CXX static library libgpuxgboost.a

[ 95%] Built target gpuxgboost

Scanning dependencies of target runxgboost

[ 97%] Building CXX object CMakeFiles/runxgboost.dir/src/cli_main.cc.o

[ 98%] Linking CXX executable ../xgboost

/usr/bin/ld: skipping incompatible /usr/lib/gcc/ppc64le-redhat-linux/4.8.5/../../../libnccl_static.a when searching for -lnccl_static

/usr/bin/ld: skipping incompatible /lib/libnccl_static.a when searching for -lnccl_static

/usr/bin/ld: skipping incompatible /usr/lib/libnccl_static.a when searching for -lnccl_static

/usr/bin/ld: cannot find -lnccl_static

collect2: error: ld returned 1 exit status

make[4]: *** [../xgboost] Error 1

make[3]: *** [CMakeFiles/runxgboost.dir/all] Error 2

make[2]: *** [all] Error 2

make[1]: *** [libxgboostp2nccl] Error 2

make: *** [xgboost] Error 2

script returned exit code 2

[pseudotensor]

non-ppc builds build, but I don't have that library either in /usr/local/cuda

x86 does have: libnccl.so.2 -> libnccl.so.2.2.13

So maybe it's trying to fall back to nccl as static because it can't find the shared library either.

Maybe the cuda installed for building the ppc is the wrong one?

[pseudotensor]

ah, ok, the docker downloads nccl2 for x86. I'll fix.