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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/29694] [gdb, gdb-index] FAIL:
 gdb.cp/stub-array-size.exp: print sizeof(a)/sizeof(a[0])
Date: Fri, 21 Oct 2022 16:13:27 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29694

--- Comment #7 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D2afd002ac6ac=
b01763d643686345cc0c6ad564bd

commit 2afd002ac6acb01763d643686345cc0c6ad564bd
Author: Tom Tromey <tromey@adacore.com>
Date:   Mon Oct 17 12:21:10 2022 -0600

    Fix incorrect .gdb_index with new DWARF scanner

    PR symtab/29694 points out a regression caused by the new DWARF
    scanner when the cc-with-gdb-index target board is used.

    What happens here is that an older version of gdb will make an index
    describing the "A" type as:

    [737] A: 1 [global, type]

    whereas the new gdb says:

    [1008] A: 0 [global, type]

    Here the old one is correct because the A in CU 0 is just a
    declaration without a size:

     <1><45>: Abbrev Number: 10 (DW_TAG_structure_type)
        <46>   DW_AT_name        : A
        <48>   DW_AT_declaration : 1
        <48>   DW_AT_sibling     : <0x6d>

    This patch fixes the problem by introducing the idea of a "type
    declaration".  I think gdb still needs to recurse into these types,
    searching for methods, but by marking the type itself as a
    declaration, gdb can skip this type during lookups and when writing
    the index.

    Regression tested on x86-64 using the cc-with-gdb-index board.

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D29694

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