[Bug backends/23902] varlocs dwarf_cfi_addrframe: unknown error

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23902

--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Kurt Roeckx from comment #4)
> The varlocs test is calling dwarf_errmsg (-1)

OK, that will show the last libdw error set on the current thread.
In which case we might actually have a candidate for why it was set.
The only place DWARF_E_UNKNOWN_ERROR is set (returned) is:

libdw/cfi.c (cie_cache_initial_state):

  /* Fetch the ABI's default CFI program.  */
  if (likely (cache->ebl != (void *) -1l)
      && unlikely (ebl_abi_cfi (cache->ebl, &abi_info) < 0))
    return DWARF_E_UNKNOWN_ERROR;

That would explain the issue on alpha at least because that doesn't have a
backend hook for abi_cfi. I suspect your mips and hppa backends also don't have
that hooked.

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