understanding ldd verbose: what are the multiple versions?

Question

When I run ldd in verbose mode, I get output like that below. What does it mean when multiple versions are listed? Does that mean that any of those versions workable, or that it needs all those versions?

    ldd -v lbrycrd-linux\ \(4\)/lbrycrdd 
        linux-vdso.so.1 (0x00007ffd167cf000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007eff77399000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007eff77191000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007eff76df3000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007eff76bdb000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007eff767ea000)
        /lib64/ld-linux-x86-64.so.2 (0x00007eff79f90000)

        Version information:
        lbrycrd-linux (4)/lbrycrdd:
            ld-linux-x86-64.so.2 (GLIBC_2.3) => /lib64/ld-linux-x86-64.so.2
            librt.so.1 (GLIBC_2.2.5) => /lib/x86_64-linux-gnu/librt.so.1
            libm.so.6 (GLIBC_2.27) => /lib/x86_64-linux-gnu/libm.so.6
            libm.so.6 (GLIBC_2.2.5) => /lib/x86_64-linux-gnu/libm.so.6
            libgcc_s.so.1 (GCC_3.3) => /lib/x86_64-linux-gnu/libgcc_s.so.1
            libgcc_s.so.1 (GCC_3.0) => /lib/x86_64-linux-gnu/libgcc_s.so.1
            libgcc_s.so.1 (GCC_4.2.0) => /lib/x86_64-linux-gnu/libgcc_s.so.1
            libpthread.so.0 (GLIBC_2.3.4) => /lib/x86_64-linux-gnu/libpthread.so.0
            libpthread.so.0 (GLIBC_2.3.3) => /lib/x86_64-linux-gnu/libpthread.so.0
            libpthread.so.0 (GLIBC_2.2.5) => /lib/x86_64-linux-gnu/libpthread.so.0
            ...

score 0 · Accepted Answer · answered Mar 08 '19 at 05:09

What does it mean when multiple versions are listed?

It means that your binary references symbols with these versions. See also this and this answer.

Does that mean that any of those versions workable, or that it needs all those versions?

The latter. Or rather, it needs a library that provides all of these symbols, which generally means GLIBC_2.27 or later for GLIBC, and GCC_4.2.0 or later for libgcc.

understanding ldd verbose: what are the multiple versions?

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