From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: [PATCH] mk: fix static link with glibc < 2.17
Date: Fri, 22 Jul 2016 17:05:28 +0200
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Cc: "Gu, YongjieX" <yongjiex.gu@intel.com>, dev@dpdk.org
To: "Azarewicz, PiotrX T" <piotrx.t.azarewicz@intel.com>
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2016-07-22 14:47, Azarewicz, PiotrX T:
> > > I was trying rc3 + fix and latest (today) dpdk version. The same fail
> > message:
> > >
> > > /x86_64-native-linuxapp-gcc/lib/librte_eal.a(eal_timer.o): In function
> > `get_tsc_freq':
> > > eal_timer.c:(.text+0x128): undefined reference to `clock_gettime'
> > > eal_timer.c:(.text+0x166): undefined reference to `clock_gettime'
> > > /x86_64-native-linuxapp-gcc/lib/librte_eal.a(eal_alarm.o): In function
> > `eal_alarm_callback':
> > > eal_alarm.c:(.text+0xda): undefined reference to `clock_gettime'
> > > /x86_64-native-linuxapp-gcc/lib/librte_eal.a(eal_alarm.o): In function
> > `rte_eal_alarm_set':
> > > eal_alarm.c:(.text+0x211): undefined reference to `clock_gettime'
> > 
> > Interesting.
> > Could check the command line in verbose mode to see where is -lrt please?
> 
> Here you are.
> -lrt is in separate line:
> 
> gcc -o test -m64 -pthread  -march=native -DRTE_MACHINE_CPUFLAG_SSE -DRTE_MACHINE_CPUFLAG_SSE2
[...]
> test_cryptodev_aes.o test_cryptodev_perf.o test_cryptodev.o test_kvargs.o -Wl,
> -lrt 
> -Wl,-lm -L/home/ptazarex/dpdk_master/x86_64-native-linuxapp-gcc/lib -Wl,-lrte_kni -Wl,-lrte_pipeline -Wl,-lrte_table -Wl,-lrte_port -Wl,-lrte_pdump -Wl,-lrte_distributor -Wl,-lrte_reorder -Wl,-lrte_ip_frag -Wl,-lrte_meter -Wl,-lrte_sched -Wl,-lrte_lpm -Wl,--whole-archive -Wl,-lrte_acl -Wl,--no-whole-archive -Wl,-lrte_jobstats -Wl,-lrte_power -Wl,--whole-archive -Wl,-lrte_timer -Wl,-lrte_hash -Wl,-lrte_vhost -Wl,-lrte_kvargs -Wl,-lrte_mbuf -Wl,-lethdev -Wl,-lrte_cryptodev -Wl,-lrte_mempool -Wl,-lrte_ring -Wl,-lrte_eal -Wl,-lrte_cmdline -Wl,-lrte_cfgfile -Wl,-lrte_pmd_bond -
[...]

The problem is that -lrt appears before -lrte_eal.
The question is: where does it come from?
It is even before _LDLIBS-y += -L$(RTE_SDK_BIN)/lib... mystery