Update PKG_CONFIG_PATH for dpdk setup on Ubuntu

[abhinavg97]

Present: The location of PKG_CONFIG_PATH does not reflect the correct location of pkgconfig upon dpdk installation

proposed: correct path as installed by dpdk

[anujkaliaiitd]

Thanks. This varies by system. We could have both, or use find to locate the .pc file.

[abhinavg97]

Using find is a better alternative I think. I included that in the latest commit.

[anujkaliaiitd]

Thanks, can we just do:

export PKG_CONFIG_PATH="${PWD}/build/install/usr/local/lib/x86_64-linux-gnu/pkgconfig:${PWD}/build/install/usr/local/lib/pkgconfig"

[sarsanaee]

Sorry quick question, does this work for ARM too?

[abhinavg97]

From what I see, for arm, the path is $PWD/build/install/usr/local/lib/aarch64-linux-gnu/pkgconfig. I think users can check the path from the find command in that case. @sarsanaee

[sarsanaee]

@abhinavg97

I am trying to build machnet following the INTERNAL documentation, and it does not build on ubuntu 22.04 and DPDK 23.10 LTS. It actually builds, but it does not RUN. It cannot find the right libraries, and it must have gotten wrong on these commits somehow.

Would you please advise?

Thanks, Alireza

[abhinavg97]

Hi @sarsanaee Could you verify the pkg config path with this command? find *path_to_dpdk* -name "*.pc"

[sarsanaee]

hi @abhinavg97

this is paths (output)

dpdk-stable-23.11.1/build/meson-uninstalled/libdpdk-uninstalled.pc dpdk-stable-23.11.1/build/meson-uninstalled/libdpdk-libs-uninstalled.pc dpdk-stable-23.11.1/build/meson-private/libdpdk.pc dpdk-stable-23.11.1/build/meson-private/libdpdk-libs.pc dpdk-stable-23.11.1/build/install/usr/local/lib/x86_64-linux-gnu/pkgconfig/libdpdk.pc dpdk-stable-23.11.1/build/install/usr/local/lib/x86_64-linux-gnu/pkgconfig/libdpdk-libs.pc

[sarsanaee]

@abhinavg97

This is basically what I am facing:

sudo GLOG_logtostderr=1 ./src/apps/machnet/machnet --config_json ~/machnet/src/apps/machnet/config.json

./src/apps/machnet/machnet: error while loading shared libraries: librte_kvargs.so.24: cannot open shared object file: No such file or directory

[abhinavg97]

Just to confirm, did you run sudo ldconfig after building dpdk?

[sarsanaee]

@abhinavg97

Yes I did.

Are you assuming that dpdk should be installed globally by any chance?

Furthermore, the error that I am facing indicates that the binary is looking for some dynamic library. In fact, it must not be looking for dpdk's dynamic libraries, as all libs should have been linked statically.