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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/30656] [gdb/symtab] optimized out static handled
 inconsistently
Date: Thu, 20 Jul 2023 06:48:28 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30656

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> I wrote a dwarf assembly test-case simulating an optimized-out static
> variable:

Also reproduced with a plain C test-case:
...
$ cat whole-program.c
static int aaa;

int
main (void)
{
  return 0;
}
$ gcc-12 whole-program.c -g -flto -O2
$ nm a.out | grep aaa
$
...

Corresponding DIE:
...
 <1><104>: Abbrev Number: 2 (DW_TAG_variable)
    <105>   DW_AT_name        : aaa
    <109>   DW_AT_decl_file   : 1
    <10a>   DW_AT_decl_line   : 1
    <10b>   DW_AT_decl_column : 12
    <10c>   DW_AT_type        : <0x110>
...

Difference in behaviour:
....
$ gdb -q -batch ./a.out -ex "print aaa"
No symbol "aaa" in current context.
$ gdb -q -batch -readnow ./a.out -ex "print aaa"
$1 =3D <optimized out>
...

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