Issues with two versions of libstdC++.so Post: 302889060

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Top Forums Programming Issues with two versions of libstdC++.so Post 302889060 by Praveen_218 on Tuesday 18th of February 2014 01:55:21 PM

02-18-2014

Registered User

Issues with two versions of libstdC++.so

I'm facing an issue in which my program is using a custom library (say, libxyz.so) which is compiled using libstdc++.so.5 and the system I'm using this library to create an executable from my program, has libstdc++so.6 as well as libstdc++.so.5; both available under /usr/lib directory.

There are multiple compilers available with the system (i.e gcc, g++34 and g++ version 4.*, IBM xlc).

When I compile my program, the resultant binary has to link libxyz.so (which has libstdc++.so.5 already) and based on further symbols need, it has to use libstdc++.so, but it by default links with libstdc++.so.6 and these two versions of libstdc++ gets its way into my executable.

This clearly shows up the cross links when done ldd on my executable. The program crashes when run. Because some classes are not compatible in libstdc++.so between versions 5 and 6.

Being C++ program, still I compiled and linked with gcc itself which is by default linking only with libstdc++.so.5 but had to use -fno-use-cxa_exception_ptr as flag to suppress the undefined reference issue on exception handling code. This made my binary having uniform links with libstdc++.so.5 through out and the program runs well. But this is just a work around and not an acceptable solution.

Is there a way, in which we can make g++ (or even g++34) to link explicitly with a particular library version overriding the default behavior to link with the latest version?

In that case I would prefer to link with libstdc++.so.5 through out.

Thanks a lot in advance for your suggestions / insight and for your precious time of course.

Regards,
PraveenK

---------- Post updated at 12:25 AM ---------- Previous update was at 12:05 AM ----------

It would also be great, if you suggest on editing the gcc/g++ compile specs. However that again is not a very open option if this is not an user account specific changes. Although I have the root access but would not be allowed to make system configuration changes.

Last edited by Praveen_218; 02-18-2014 at 02:50 PM.. Reason: Typo errors.

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__gnu_cxx::__mt_alloc

__gnu_cxx::__mt_alloc< _Tp, _Poolp >(3) 		     Library Functions Manual			   __gnu_cxx::__mt_alloc< _Tp, _Poolp >(3)

NAME

       __gnu_cxx::__mt_alloc< _Tp, _Poolp > -

SYNOPSIS

       Inherits __gnu_cxx::__mt_alloc_base< _Tp >.

   Public Types
       typedef _Poolp __policy_type
       typedef _Poolp::pool_type __pool_type
       typedef const _Tp * const_pointer
       typedef const _Tp & const_reference
       typedef ptrdiff_t difference_type
       typedef _Tp * pointer
       typedef std::true_type propagate_on_container_move_assignment
       typedef _Tp & reference
       typedef size_t size_type
       typedef _Tp value_type

   Public Member Functions
       __mt_alloc (const __mt_alloc &) noexcept
       template<typename _Tp1 , typename _Poolp1 > __mt_alloc (const __mt_alloc< _Tp1, _Poolp1 > &) noexcept
       const __pool_base::_Tune _M_get_options ()
       void _M_set_options (__pool_base::_Tune __t)
       pointer address (reference __x) const noexcept
       const_pointer address (const_reference __x) const noexcept
       pointer allocate (size_type __n, const void *=0)
       template<typename _Up , typename... _Args> void construct (_Up *__p, _Args &&...__args)
       void deallocate (pointer __p, size_type __n)
       template<typename _Up > void destroy (_Up *__p)
       size_type max_size () const noexcept

Detailed Description
   template<typename _Tp, typename _Poolp = __common_pool_policy<__pool,  true >>class __gnu_cxx::__mt_alloc< _Tp, _Poolp >
       This is a fixed size (power of 2) allocator which - when compiled with thread support - will maintain one freelist per size per thread plus
       a global one. Steps are taken to limit the per thread freelist sizes (by returning excess back to the global list).

       Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt12ch32.html.

       Definition at line 639 of file mt_allocator.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Jun 10 2014			   __gnu_cxx::__mt_alloc< _Tp, _Poolp >(3)