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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/101905] Missed debug information for global register
 variable
Date: Mon, 16 Aug 2021 09:03:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101905

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2021-08-16
           Keywords|                            |wrong-debug
      Known to fail|                            |12.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We get

 <1><2d>: Abbrev Number: 2 (DW_TAG_variable)
    <2e>   DW_AT_name        : (indirect string, offset: 0x39): regVar
    <32>   DW_AT_decl_file   : 1
    <33>   DW_AT_decl_line   : 1
    <34>   DW_AT_decl_column : 16
    <35>   DW_AT_type        : <0x39>
    <39>   DW_AT_external    : 1

that's obviously a bit off.  Not sure if there's a good DWARF representation
for global reg vars.=