Finding which glibc we are using.

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  1. Making sure which gcc executable we are using.

  2. gcc -print-file-name=libc.so to show the glibc’s path.

    # gcc-10 -print-file-name=libc.so
/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/libc.so

  3. The libc.so is almost certainly a linker script, cat it to find out the actual path of the shared library.

    /* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf64-x86-64)
GROUP ( /lib/x86_64-linux-gnu/libc.so.6 /usr/lib/x86_64-linux-gnu/libc_nonshared.a  AS_NEEDED ( /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2 ) )

  4. Execute the shared library file and check the version it prints.

    GNU C Library (Ubuntu GLIBC 2.31-0ubuntu9.17) stable release version 2.31.
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 9.4.0.
libc ABIs: UNIQUE IFUNC ABSOLUTE
For bug reporting instructions, please see:
<https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.