[Bug symtab/31295] Slow symbol lookup due to missing DW_AT_const_value attribute

["dmitry.neverov at jetbrains dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31295

--- Comment #3 from Dmitry Neverov <dmitry.neverov at jetbrains dot com> ---
Sorry, I didn't describe it properly, the setup is more
complicated. The wxString should be in shared library.

$ cat str.h
#ifndef STR_H
#define STR_H
#include <cstdlib>

class wxString
{
public:
    static const size_t npos;
    char *data;
    size_t len;
};

#endif //STR_H

$ cat str.cpp
#include "str.h"

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

$ cat util.h
#ifndef UTIL_H
#define UTIL_H

int f();

#endif //UTIL_H

$ cat util.cpp
#include "util.h"
#include "str.h"

int f() {
  wxString s = {};
  return s.len == wxString::npos ? 1 : 0;
}

$ cat main.cpp
#include <iostream>
#include "str.h"
#include "util.h"

int main() {
  wxString str = {};
  std::cout << wxString::npos << std::endl;
  std::cout << f();
  return 0;
}

$ g++ -g -fPIC -c str.cpp
$ g++ -shared -o libstr.so str.o
$ g++ -g -c util.cpp
$ g++ -g -I. -L. -o main main.cpp util.o -lstr
$ gdb -q --batch main -ex "set trace-commands on" -ex "set logging enabled on"
-ex "b main.cpp:7" -ex "run" -ex "maint info symtab" -ex "print str" -ex "maint
info symtab"

The last command shows that "print str" at main.cpp:7 loads
util.cpp.

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