Home/ Questions/Steps to fix the error “error adding symbols: dso missing from command line”
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Mackenzie Walsh
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Asked: 2022-05-17T14:34:11+00:00 In:

Steps to fix the error “error adding symbols: dso missing from command line”

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I’m building a new program, but when I run it, an error pops up. The error displayed is as follows:

gcc -Wstrict-prototypes -Wall -Wno-sign-compare -Wpointer-arith
  -Wdeclaration-after-statement -Wformat-security -Wswitch-enum -Wunused-parameter -Wstrict-aliasing -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -Wno-override-init -g -O2 -export-dynamic ***-lpthread*** -o utilities/ovs-dpctl utilities/ovs-dpctl.o lib/libopenvswitch.a
  /home/jyyoo/src/dpdk/build/lib/librte_eal.a
  /home/jyyoo/src/dpdk/build/lib/libethdev.a
  /home/jyyoo/src/dpdk/build/lib/librte_cmdline.a
  /home/jyyoo/src/dpdk/build/lib/librte_hash.a
  /home/jyyoo/src/dpdk/build/lib/librte_lpm.a
  /home/jyyoo/src/dpdk/build/lib/librte_mbuf.a
  /home/jyyoo/src/dpdk/build/lib/librte_ring.a
  /home/jyyoo/src/dpdk/build/lib/librte_mempool.a
  /home/jyyoo/src/dpdk/build/lib/librte_malloc.a -lrt -lm 
  /usr/bin/ld: /home/jyyoo/src/dpdk/build/lib/librte_eal.a(eal.o): undefined reference
  to symbol 'pthread_create@@GLIBC_2.2.5'
  /lib/x86_64-linux-gnu/libpthread.so.0: error adding symbols: DSO missing from 
  command line

I have tried several workarounds, but they still do not get the desired results. If you have come across this situation and have a solution for the “error adding symbols: dso missing from command line” problem, pls let me know. Here is what I do:

$ readelf -s /lib/x86_64-linux-gnu/libpthread.so.0 | grep pthread_create
  199: 0000000000008220 2814 FUNC GLOBAL DEFAULT 13 pthread_create@@GLIBC_2.2.5
  173: 0000000000008220 2814 FUNC LOCAL DEFAULT 13 __pthread_create_2_1
  462: 0000000000008220 2814 FUNC GLOBAL DEFAULT 13 pthread_create@@GLIBC_2.2

Thanks!

error adding symbols
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2 Answers

  1. Best Answer
    Expert

    The cause: I think the cause of this error is that you don’t mention the library on the command line before the object files being compiled.

    The solution: After the object files are compiled, you should mention the library on the command line:

    gcc -Wstrict-prototypes -Wall -Wno-sign-compare -Wpointer-arith -Wdeclaration-after-statement -Wformat-security -Wswitch-enum -Wunused-parameter -Wstrict-aliasing -Wbad-function-cast -Wcast-align -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-field-initializers -Wno-override-init \
    -g -O2 -export-dynamic -o utilities/ovs-dpctl utilities/ovs-dpctl.o \
    lib/libopenvswitch.a \
    /home/jyyoo/src/dpdk/build/lib/librte_eal.a /home/jyyoo/src/dpdk/build/lib/libethdev.a /home/jyyoo/src/dpdk/build/lib/librte_cmdline.a /home/jyyoo/src/dpdk/build/lib/librte_hash.a /home/jyyoo/src/dpdk/build/lib/librte_lpm.a /home/jyyoo/src/dpdk/build/lib/librte_mbuf.a /home/jyyoo/src/dpdk/build/lib/librte_ring.a /home/jyyoo/src/dpdk/build/lib/librte_mempool.a /home/jyyoo/src/dpdk/build/lib/librte_malloc.a \
    -lrt -lm -lpthread

    Explanation: The sequence of modules affects the linkage. Symbols are requested first, then linked in from a library with them. As a result, you must identify modules that use libraries first, followed by libraries. As an example:

    gcc x.o y.o z.o -la -lb -lc
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  2. Distribution / compiler version is what determines the error message

    Ubuntu Saucy 

    /usr/bin/ld: /mnt/root/ffmpeg-2.1.1//libavformat/libavformat.a(http.o): undefined reference to symbol 'inflateInit2_'
/lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line

    Ubuntu Raring: (more information) 

    /usr/bin/ld: note: 'uncompress' is defined in DSO /lib/x86_64-linux-gnu/libz.so.1 so try adding it to the linker command line

    Solution It is possible that you are missing a library during your compilation steps. In my case, I added “-lz” to makefile/GCC flags.

    Background A dynamic shared object (or shared library) is DSO.

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