[Bug libdw/30047] libdw unable to handle DW_TAG_unspecified_type

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30047

Mark Wielaard <mark at klomp dot org> changed:

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                 CC|                            |mark at klomp dot org

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
This is slightly tricky, because I think we technically do the right thing
here.

dwfl_module_return_value_location returns that cannot handle DWARF type
description error, which is technically correct, since it is an
unspecified_type.

dwfl_module_return_value_location can return an error (< 0) which means either
bad DWARF or unknown/unhandled type, it can return zero, which means the
function has no return value, or it return the number of DWARF expression
operations (> 0) that describe how to get the value returned by the function.

Sadly we don't have an easy way to distinguish between bad DWARF/type and
cannot handle type.

I think we can change the testcase though, to check for the special case of
DW_TAG_unspecified_type.

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