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Thread: Using bzip2 in a C program on Ubuntu

  1. #1
    Join Date
    Feb 2019
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    4

    Question Using bzip2 in a C program on Ubuntu

    Hi, I have done "sudo apt-get install libbz2-dev" so that my #include <bzlib.h> in my C file works.

    But now, it doesn't compile because it cannot find reference, even though I used the -lbz2 flag too as mentioned in this post:

    Code:
    niranjhana@niranjhana-XPS-13-9360:~$ gcc -lbz2 main.c
    /tmp/ccy3Z1M5.o: In function `main':
    main.c: (.text+0x13): undefined reference to `BZ2_bzlibVersion'
    main.c: (.text+0x8e): undefined reference to `BZ2_bzBuffToBuffCompress'
    collect2: error: ld returned 1 exit status
    How can I get it to work? What's missing here?
    Last edited by slickymaster; December 12th, 2019 at 04:19 PM. Reason: code tags and font

  2. #2
    Join Date
    Jan 2010
    Location
    Wheeling WV USA
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    1,595
    Distro
    Xubuntu 18.04 Bionic Beaver

    Re: Using bzip2 in a C program on Ubuntu

    do the standard bz2 commands work on that system? i'm guessing that they need the same libraries. but i don't even know if those are the correct names to reference as i have never used bz2 in C, before. i'd look to see what these libs have in them and see how close my coding is.

    the bzip2 command works for me and my system has these installed:
    Code:
    lt2a/forums /home/forums 1> dpkg -l|fgrep bz
    ii  aptdaemon                    1.1.1+bzr982-0ubunt all                 transaction based package management service
    ii  aptdaemon-data               1.1.1+bzr982-0ubunt all                 data files for clients
    ii  bzip2                        1.0.6-8.1ubuntu0.2  amd64               high-quality block-sorting file compressor - utilities
    ii  libbz2-1.0:amd64             1.0.6-8.1ubuntu0.2  amd64               high-quality block-sorting file compressor library - runtime
    ii  libzbar0:amd64               0.10+doc-10.1build2 amd64               bar code scanner and decoder (library)
    ii  libzephyr4:amd64             3.1.2-1build2       amd64               Project Athena's notification service - non-Kerberos librarie
    ii  libzmq5:amd64                4.2.5-1ubuntu0.2    amd64               lightweight messaging kernel (shared library)
    ii  libzstd1:amd64               1.3.3+dfsg-2ubuntu1 amd64               fast lossless compression algorithm
    ii  libzvbi-common               0.2.35-13           all                 Vertical Blanking Interval decoder (VBI) - common files
    ii  libzvbi0:amd64               0.2.35-13           amd64               Vertical Blanking Interval decoder (VBI) - runtime files
    ii  pike8.0-bzip2                8.0.498-1build1     amd64               Bzip2 module for Pike
    ii  python3-aptdaemon            1.1.1+bzr982-0ubunt all                 Python 3 module for the server and client of aptdaemon
    ii  python3-aptdaemon.gtk3widget 1.1.1+bzr982-0ubunt all                 Python 3 GTK+ 3 widgets to run an aptdaemon client
    lt2a/forums /home/forums 2>
    You can't have my Windows 95 until you pry it from my cold dead 1 GB IDE hard drive.

  3. #3
    Join Date
    Aug 2010
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    Lancs, United Kingdom
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    1,530
    Distro
    Ubuntu Mate 16.04 Xenial Xerus

    Re: Using bzip2 in a C program on Ubuntu

    Code:
    gcc main.c -lbz2
    Some time ago, gcc was changed to require libraries to occur after the code that used them. Once upon a time it didn't matter.
    Last edited by slickymaster; December 12th, 2019 at 04:20 PM. Reason: Normal font

  4. #4
    Join Date
    Feb 2019
    Beans
    4

    Re: Using bzip2 in a C program on Ubuntu

    This worked, thanks!

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