https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69513
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
This means the DIE in question was created too late or figured unreachable.
case dw_val_class_die_ref:
if (AT_ref_external (a))
...
else
{
gcc_assert (AT_ref (a)->die_offset);
dw2_asm_output_data (DWARF_OFFSET_SIZE, AT_ref (a)->die_offset,
"%s", name);
both 'die' and AT_ref (a) would be interesting to look at.
