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Thread: Why GCC uses minimum glibc version in OpenSuse?

  1. #1

    Question Why GCC uses minimum glibc version in OpenSuse?

    I'm using opensuse as my main workstation.

    When i build my projects and deploy them on opensuse usually there isn't any problem for some dependencies like glibc.
    I can easily create appimage without including glibc and it runs on other distros even old versions.

    It is very interesting for me, when i check my built files with some tools like "objdump" , i sea that the compiler used the lowest level of glibc.

    For example for now my glibc version is 2.31 and in the binany only these sumbols are exist:

    Code:
    DYNAMIC SYMBOL TABLE: 
    0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 printf 
    0000000000000000      DF *UND*  0000000000000000  GLIBC_2.2.5 __libc_start_main 
    0000000000000000  w   D  *UND*  0000000000000000  Base        __gmon_start__
    

    It uses "GLIBC_2.2.5" for printf

    That's great



    But when i build on other distros the result is not like this.

    For example same code on fedora (with glibc 2.35 or 2.34) uses "GLIBC_2.34" for printf.

    I tested in some other distros and versions, and other version of gcc.
    Even i downloaded gcc from opensuse repos and ran on other distros.

    My question is why does this happen?

    Does he use a special config?

    Or did I get something wrong?

  2. #2
    Join Date
    Sep 2012
    Posts
    8,256

    Default Re: Why GCC uses minimum glibc version in OpenSuse?

    The version comes from glibc itself.
    Code:
    bor@tw:/tmp> objdump -T /usr/lib64/libc.so.6 | grep -w printf
    000000000007347e g    DF .text    00000000000000ce  GLIBC_2.2.5 printf
    bor@tw:/tmp> rpm -q glibc
    glibc-2.35-5.1.x86_64
    bor@tw:/tmp>
    This is also the version in glibc upstream sources. I do not know how Fedora builds their glibc, try asking there.

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