Hi Keith, Thanks a lot, that resolved my issue.
The key is to use --whole-archive instead of --no-as-needed. --no-as-needed doesn't work. Thanks, Hui On Mon, Mar 5, 2018 at 5:28 AM, Wiles, Keith <keith.wi...@intel.com> wrote: > > > > On Mar 5, 2018, at 3:15 AM, Hui Liu <onlyfl...@gmail.com> wrote: > > > > 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 > > --sysroot=/home/hliu/atomos/build-temp/build/tmp/work/ > core2-64-poky-linux/unittest/0.0-r0/recipe-sysroot > > -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 > > One way with the above is to use —whole-archive … —no-whole-archive around > the archives you want to force include. The other way to is include the .o > files as part of the link line instead of the .a file. The problem with > —whole-archive is it pulls in the complete archive and increases footprint. > Using the .o method is normally used here and they include these .o files > in the application Makefile. > > > > > > On Sun, Mar 4, 2018 at 9:08 PM, Hui Liu <onlyfl...@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 > > -- > > Regards, > Keith > > -- Thanks & Best Regards Liu Hui --