[Bug c++/16866] New: Gdb does not show actual STL types on AIX 5.2/5.3

["krzysztof.treyderowski at lhsystems dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16866

            Bug ID: 16866
           Summary: Gdb does not show actual STL types on AIX 5.2/5.3
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: krzysztof.treyderowski at lhsystems dot com

GDB compiled with python enabled feature. Version 7.7 compiled with gcc 4.4.5
(on 4.7.2 same result).

Compilation unit:
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main() {
        string str = "some string";

        cout << "str = " << str << endl;

        vector<double> vect;
        vect.push_back(1.0);
        vect.push_back(5.5);
        vect.push_back(10.5);

        cout << "ending ..." << endl;

        return 0;
}
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Compiled with -g or -ggdb3 (same result for both settings).

Result of debugging:

~/GDB/bin/bin/gdb ./main
GNU gdb (GDB) 7.7
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "powerpc-ibm-aix5.2.0.0".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./main..
(gdb) break 19
Breakpoint 1 at 0x10000690: file main.cc, line 19.
(gdb) run
Starting program: /u/U297980/main
str = some string
ending ...

Breakpoint 1, main () at main.cc:19
19              return 0;
(gdb) print str
$1 = {static npos = <error reading variable: No global symbol "_ZNSs4nposE".>0,
_M_dataplus = {<allocator> = {<new_allocator> = {<No data fields>}, <No data
fields>}, _M_p = 0x20000e44 "some string"}}
(gdb) print vect
$2 = {<_Vector_base> = {_M_impl = {<allocator> = {<new_allocator> = {<No data
fields>}, <No data fields>}, _M_start = 0x20000e88, _M_finish = 0x20000ea0,
      _M_end_of_storage = 0x20000ea8}}, <No data fields>}
(gdb)

In comparison with debugging on Debian Linux (GCC 4.7.2, GDB 7.4.1-debian):
(gdb) print str
$1 = {static npos = <optimized out>, _M_dataplus = {<std::allocator<char>> =
{<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p
= 0x804c014 "some string"}}
(gdb) print vect
$2 = {<std::_Vector_base<double, std::allocator<double> >> = {_M_impl =
{<std::allocator<double>> = {<__gnu_cxx::new_allocator<double>> = {<No data
fields>}, <No data fields>}, _M_start = 0x804c050,
      _M_finish = 0x804c068, _M_end_of_storage = 0x804c070}}, <No data fields>}

Difference: allocator exact type is different.

Main reason why I'm filing this bug is that on AIX5.2/5.3, gdb with
python-enabled pretty printers does not work. I suspect, that these pretty
printers  do not work because of above problem.

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