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From: "drepper.fsp at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug macros/29725] New: Dwarf 5 C macros not handled
Date: Wed, 26 Oct 2022 09:59:04 +0000
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X-Bugzilla-Component: macros
X-Bugzilla-Version: 12.1
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29725

            Bug ID: 29725
           Summary: Dwarf 5 C macros not handled
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: macros
          Assignee: unassigned at sourceware dot org
          Reporter: drepper.fsp at gmail dot com
  Target Milestone: ---

See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107414 for the gcc
maintainer's analysis.  Jakub thinks this is a gdb issue.

Copied from the gcc bug:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=
~~~~~~~Take
this code:

union node {
  struct {
    int a;
  } l;
} x;

#define memory l.a

int main()
{
  return x.memory;
}

When compiled with -gdwarf-4 -g3 and run in gdb, it is possible to use

Breakpoint 1, main () at u.c:11
11        return x.memory;
(gdb) p x.memory
$1 =3D 0

When instead -gdwarf-5 -g3 is used 'memory' is not known to be a macro and =
one
gets

Breakpoint 1, main () at u.c:11
11        return x.memory;
(gdb) p x.memory
There is no member named memory.

Shouldn't the Dwarf 5 data be a superset of what Dwarf 4 provides?

This is not new in the trunk/13 version.  12.1 fails as well and likely pri=
or
versions, too.

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