C++ is a programming language that none of the programmers is unaware of. It is used to design or develop computer programs, operating systems, browsers, different games, etc. C++ gained popularity in a quick time after its launch. Different elements on a website can also be designed with C++, and that’s the reason even beginners are practicing learning it. When working, you may experience “error adding symbols: dso missing from command line”, which can halt the program you are working on.
It is obviously frustrating. But, no need to feel that. We are here to give you top-notch ideas and solutions to remove the error. Have a look at how the error occurs
How the error pops up
When you create a program, you get an error warning. Have a look at the program code
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 lineYou may have tried symbols that may look like this
$ 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_2.2This also results in the error warning. You must be wondering how to fix it. Have a look at the solutions to handle the exception
How to Fix the Error “error adding symbols: dso missing from command line”
The command line error shows up when you miss mentioning the library before compiling the object files.
Solution 1 – Add the library in the command line
The solution to fix the error in the simpler war, you need to make sure to add the library on your command line after compiling the object files. Take a look at the code
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 -lpthreadThe linkage relies on the module’s order. Firstly, symbols are requested and later linked in from a library. Modules have to be specified that use the library before and after. It must be like the following
gcc x.o y.o z.o -la -lb -lcSolution 2 – For Ubuntu
To solve the error for Ubuntu, follow the below code
For Ubuntu Raring
/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 lineFor 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 lineConclusion
We have highlighted the solutions to fix the error “error adding symbols: dso missing from command line”. These solutions can remove the error and let you code the program the way you want. I wish you luck!
Reference Source: https://www3.risc.jku.at/education/courses/ws2003/intropar/origin-new/MproCplrDbx_TG/sgi_html/ch03.html
https://zhangboyi.gitlab.io/post/2020-09-14-resolve-dso-missing-from-command-line-error/