[Bug gdb/16343] New: GDB can't display static class members of a dynamically linked library

["be.gentner at googlemail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16343

            Bug ID: 16343
           Summary: GDB can't display static class members of a
                    dynamically linked library
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: critical
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: be.gentner at googlemail dot com

GDB can't display contents/adresses of static class members which are compiled
into shared libraries and used from an executable as a dynamically linked
library.

Below an example which demonstrates the problem. The StaticData::x is a pointer
and after the assignment of the int variable it still holds the adress 0x0. GDB
can't dereference the pointer.

There are no problems if getters/setters are used for accessing static class
members or if the static class members aren't linked dynamically in a library.

program.cpp:

#include <iostream>
#include "static.h"

int main(int argc, char* argv[])
{
  int i = 15;
  StaticData::x = &i;
  std::cout << *StaticData::x;
  return 0;
}

static.h

class StaticData
{
public:
    static int * x;
};

static.cpp

#include "static.h"

int * StaticData::x = 0;


GCC compile options:
// Build shared library
g++ -shared -fPIC -o liblib.so static.cpp -g

g++ -o program program.cpp -L./ -llib -Wl,-rpath,... -g

Program output:
15

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