[dpdk-users] DPDK library link issue with __attribute__((constructor))

Hui Liu onlyflyer at gmail.com
Mon Mar 5 10:15:31 CET 2018

I tried to put all the library into the command, but it still doesn't work.
That's wired...

x86_64-poky-linux-gcc -m64 -march=core2 -mtune=core2 -msse3 -mfpmath=sse
-Wl,--hash-style=gnu -Wl,--no-as-needed -o l2_ut_dpdk l2_ut_dpdk.c -Wall
-Werror -g -lrte_mempool_stack -lrte_pmd_i40e -lrte_pmd_ark -lrte_ethdev
-lrte_pmd_null -lrte_pmd_null_crypto -lrte_lpm -lrte_pmd_ena -lrte_kvargs
-lrte_cmdline -lrte_pmd_tap -lrte_pmd_sw_event -lrte_latencystats
-lrte_bitratestats -lrte_efd -lrte_sched -lrte_pmd_kni -lrte_pmd_qede
-lrte_hash -lrte_pmd_enic -lrte_pdump -lrte_pmd_lio -lrte_acl
-lrte_pmd_af_packet -lrte_eventdev -lrte_port -lrte_ip_frag -lrte_pmd_bond
-lrte_pmd_sfc_efx -lrte_pmd_e1000 -lrte_mbuf -lrte_pmd_virtio -lrte_metrics
-lrte_cryptodev -lrte_reorder -lrte_pmd_ring -lrte_eal -lrte_distributor
-lrte_vhost -lrte_pmd_bnxt -lrte_timer -lrte_pmd_avp
-lrte_pmd_crypto_scheduler -lrte_pmd_thunderx_nicvf
-lrte_pmd_skeleton_event -lrte_pmd_nfp -lrte_jobstats -lrte_net
-lrte_mempool -lrte_pmd_ixgbe -lrte_mempool_ring -lrte_pipeline
-lrte_pmd_octeontx_ssovf -lrte_pmd_vhost -lrte_meter -lrte_pmd_cxgbe
-lrte_kni -lrte_pmd_vmxnet3_uio -lrte_ring -lrte_pmd_fm10k -lrte_table
-lrte_cfgfile -lpthread -ldl

On Sun, Mar 4, 2018 at 9:08 PM, Hui Liu <onlyflyer at gmail.com> wrote:

> Hi Guys,
> I am using DPDK with the yocto build system.
> I found some static library is not linked because of the linker's
> as-needed decision.
> Some .a file use __attribute__((constructor)) to register their APIs,
> we only know if we use these APIs at runtime, but linker make the decision
> early and then discarded them.
> I tried a lot to link the library I need:
> 1, use -Wl, --no-as-needed, for example:
> gcc a.c *-Wl, --no-as-needed* -ldl -ldpdk
> 2, Put the library explicitly to the linker like this:
> gcc a.c -Wl, --no-as-needed -ldl -ldpdk *-lrte_mempool*
> At last, I still didn't find my library in the elf file.
> Is there anything else I can try to link these library?
> --
> Thanks & Best Regards
> Liu Hui
> --

Thanks & Best Regards
Liu Hui

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