Subj : Linker problems in Builder C++ 6
To   : borland.public.cpp.borlandcpp
From : mauro russo
Date : Thu Sep 15 2005 11:29 am

I'm using Borland C++ 6 and i already downloaded and installed
the update 4.
I have a code that produces linker warnings like:
[Linker Warning] Public symbol 'bool _STL::operator <(const
_STL::basic_string<char, _STL::char_traits<char>, _STL::allocator<char> >&,
const _STL::basic_string<char, _STL::char_traits<char>,
_STL::allocator<char> >&)' defined in both module C:\MODULI_SW\SB_9A\UNIPROG
1.1 BUILDER 6\BASE_UNIPROG.OBJ and C:\MODULI_SW\SB_9A\UNIPROG 1.1 BUILDER
6\CORE.OBJ

I could see, by debugging, as soon as the program starts [by pressing, only
one time, F7 ('TraceInto')]
that some of implementations of that operator< is wrong.
I mean i saw the CPU window and i saw this situation (by [manual]copy and
paste from CPU window):

_STL::less<_STL::basic_string<char, _STL::char_traits<char>,
_STL::allocator<char> > >::operator ()(const _STL::basic_string<char,
_STL::char_traits<char>, _STL::allocator<char> >&, const
_STL::basic_string<char, _STL::char_tr:
00443438 55                            push ebp
00443439 8BEC                      move ebp,esp
0044343B FF7510                  push dword ptr [ebp+0x10]
0044343E FF750C                  push dword ptr [ebp+0x0c]
00443441 E80A28FCFF         call _STL::list<_STL::pair<Tporta *,bool>,
_STL::allocator<_STL::pair<Tporta *,bool> > >::list<_STL::pair<Tporta *,
bool>, _STL::allocato<_STL::pair<Tporta *,bool> > >()
00443446 83C408                   add esp,0x08
stl/_function_base.h.73:
00443449 5D                           pop ebp
0044344A C3                          ret
0044344B 90                           nop
......
and
[adress where it jumps with the call of 00443441]
_STL::list<_STL::pair<Tporta *,bool>, _STL::allocator<_STL::pair<Tporta
*,bool> > >::list<_STL::pair<Tporta *, bool>,
_STL::allocator<_STL::pair<Tporta *,bool> > >()
00405C50 55                           push ebp
00405C51 8BEC                     mov ebp,esp
....other instructions whitout jumps....
00405C6C E863EEFFFF        call _STL::_String_base<char,
_STL::allocator<char> >::_String_base<char, _STL::allocator<char> >(const
_STL::allocator<char> &)
......


For others implementations [different CPU addresses], i could see it's all
right, whitout list<pair<Tporta*,bool> >::allocator call.
But it's weard that in the wrong implementation it looks that the
implementation in 00405C50 address is correct because it calls
methods of _STL::_String_base class!
So, is it an IDE error in the show or a link error?
I think the second, because the wrong implementation generates updating of
const objects and that get's an exception later in the running.

Some advice or quesiont ot better understand the condition?

Very thanks for help.

.