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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/27464] New: CU referenced from PU (--odr-mode=link
 case) (bis)
Date: Wed, 24 Feb 2021 17:37:21 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27464

            Bug ID: 27464
           Summary: CU referenced from PU (--odr-mode=3Dlink case) (bis)
           Product: dwz
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: vries at gcc dot gnu.org
                CC: dwz at sourceware dot org
  Target Milestone: ---

Using the same assert as in PR25424, and using the tentative patch series, =
we
run into:
...
$ dwz cc1.dwz-processed -o 1 -lnone --odr=20
dwz: /home/vries/dwz/dwz.git/dwz.c:12601: write_die: Assertion `IMPLIES
(cu->cu_kind =3D=3D CU_PU, die_cu (refd)->cu_kind =3D=3D CU_PU)' failed.
Aborted (core dumped)
...

This is related to the duplicate chain:
...
 28dd83f O b500801d 621b6872  pointer_type (type: 28dd72f die_struct
structure_type)
 2903769 O b500801d 621b6872  pointer_type (type: 28dd72f die_struct
structure_type)
...
which are both in the same CU:
...
 <0><28d281f>: Abbrev Number: 200 (DW_TAG_compile_unit)

 <1><28dd72f>: Abbrev Number: 35 (DW_TAG_structure_type)
    <28dd730>   DW_AT_name        : (indirect string, offset: 0x1b2ca6):
die_struct
    <28dd734>   DW_AT_byte_size   : 80
    <28dd735>   DW_AT_decl_file   : 87
    <28dd736>   DW_AT_decl_line   : 3069
    <28dd738>   DW_AT_decl_column : 63
    <28dd739>   DW_AT_sibling     : <0x28dd83b>
 <1><28dd83f>: Abbrev Number: 9 (DW_TAG_pointer_type)
    <28dd840>   DW_AT_byte_size   : 8
    <28dd841>   DW_AT_type        : <0x28dd72f>

 <1><2903769>: Abbrev Number: 9 (DW_TAG_pointer_type)
    <290376a>   DW_AT_byte_size   : 8
    <290376b>   DW_AT_type        : <0x28dd72f>

 <0><2911617>: Abbrev Number: 177 (DW_TAG_compile_unit)
...

The dup chain is forced to a partial unit, but the die_struct DIE is not,
because it's not part of a duplicate chain, and it's not marked as a single=
ton.

--=20
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