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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/31295] Slow symbol lookup due to missing
 DW_AT_const_value attribute
Date: Fri, 26 Jan 2024 05:22:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31295

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vries at gcc dot gnu.org

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
I build the gdb-14.1-release tag.  Then I tried constructing a 2-CU example=
 out
of comment 0.  But I don't manage to reproduce the described behaviour, I s=
ee
only one CU being expanded.  I tried compiling with both gcc-12 and clang
15.0.7:
...
$ cat test.h
#include <cstddef>

class wxString
{
public:
  static const size_t npos;
};
$ cat test.cpp
#include "test.h"

const size_t wxString::npos =3D (size_t) -1;

extern int foo (void);

int
main (void)
{
  return foo ();
}
$ cat test-2.cpp
#include "test.h"

extern int foo (void);

int
foo (void)
{
  return wxString::npos + 1;
}
$ g++-12 test.cpp test-2.cpp -g
$ gdb -q -batch a.out -ex "set trace-commands on" -ex "maint info symtab" -=
ex
"ptype wxString" -ex "maint info symtab"
+maint info symtab
+ptype wxString
type =3D class wxString {
  public:
    static const size_t npos;
}
+maint info symtab
{ objfile /data/vries/gdb/a.out ((struct objfile *) 0x48beb90)
  { ((struct compunit_symtab *) 0x48b62a0)
    debugformat DWARF 4
    producer GNU C++17 12.3.0 -mtune=3Dgeneric -march=3Dx86-64 -g
    name test.cpp
    dirname /home/vries/gdb
    blockvector ((struct blockvector *) 0x48f82a0)
    user ((struct compunit_symtab *) (null))
        { symtab test.cpp ((struct symtab *) 0x48b6320)
          fullname (null)
          linetable ((struct linetable *) 0x48f82d0)
        }
        { symtab /usr/include/c++/12/x86_64-suse-linux/bits/c++config.h
((struct symtab *) 0x48b6360)
          fullname (null)
          linetable ((struct linetable *) 0x0)
        }
        { symtab /usr/lib64/gcc/x86_64-suse-linux/12/include/stddef.h ((str=
uct
symtab *) 0x48b63a0)
          fullname (null)
          linetable ((struct linetable *) 0x0)
        }
        { symtab /usr/include/c++/12/cstddef ((struct symtab *) 0x48b63e0)
          fullname (null)
          linetable ((struct linetable *) 0x0)
        }
        { symtab test.h ((struct symtab *) 0x48b6420)
          fullname (null)
          linetable ((struct linetable *) 0x0)
        }
  }
}
...

--=20
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