[Bug symtab/25771] Inter-cu DW_AT_abstract_origin results in wrong file

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25771

--- Comment #2 from Simon Marchi <simark at simark dot ca> ---
Let me rephrase the problem to make sure I understand.  We have a compile unit
(let's call it Importer) importing (with DW_TAG_imported_unit) another compile
unit (let's call it Importee).  This means that Importer knows about Importee,
but Importee does not know about Importer.

Importee defines a variable (let's call it BaseVar), with a DW_AT_decl_file. 
That number necessarily refers to its own file table.  Importer defines a
variable (let's call it ChildVar) that extends (with DW_AT_abstract_origin)
BaseVar.  ChildVar inherits the DW_AT_decl_file attribute from BaseVar.  The
value of the attribute necessarily refers to Importee's file table.

>From what I understand, GDB currently uses the DW_AT_decl_file value defined by
Importee to look up the file name in Importer's file table.  If that's the
case, I'd say GDB is at fault.

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