https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82857
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> --- The dwz man shows: ... -M NAME --multifile-name NAME Specify the name of the common file that should be put into the .gnu_debugaltlink section alongside with its build ID. By default dwz puts there the argument of the -m option. ... The debugaltlink looks like: ... $ objdump -s a.out.debug Contents of section .gnu_debugaltlink: 0000 636f6d6d 6f6e2e64 65627567 00583730 common.debug.X70 0010 8a56187b b2abdbbd 93929f3f f623059e .V.{.......?.#.. 0020 2f / ... and given that this is the buildid of common.debug: ... $ file common.debug common.debug: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), BuildID[sha1]=5837308a56187bb2abdbbd93929f3ff623059e2f, with debug_info, not stripped ... indeed .gnu_debugaltlink looks like the zero-terminated "common.debug" string followed by the buildid.