[Bug libstdc++/51673] New: undefined references / libstdc++-7.dll

["pluto at agmk dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51673

             Bug #: 51673
           Summary: undefined references / libstdc++-7.dll
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pluto@agmk.net


Created attachment 26182
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26182
testcase with libstdc++-6/7.dll

with gcc crosscompiler configured for target x86_64-pc-mingw32 with
--enable-symvers=gnu-versioned-namespace --enable-libstdcxx-allocator=mt
i'm getting linker errors on trivial testcase.


/home/users/pluto/tmp/ccsZppkB.o:t.cpp:(.text$_ZN9__gnu_cxx3__710__mt_allocIiNS0_20__common_pool_policyINS0_6__poolELb1EEEE8allocateEyPKv[__gnu_cxx::__7::__mt_alloc<int,
__gnu_cxx::__7::__common_pool_policy<__gnu_cxx::__7::__pool, true>
>::allocate(unsigned long long, void const*)]+0x63): undefined reference to
`operator new(unsigned long long)'
/home/users/pluto/tmp/ccsZppkB.o:t.cpp:(.text$_ZN9__gnu_cxx3__710__mt_allocIiNS0_20__common_pool_policyINS0_6__poolELb1EEEE8allocateEyPKv[__gnu_cxx::__7::__mt_alloc<int,
__gnu_cxx::__7::__common_pool_policy<__gnu_cxx::__7::__pool, true>
>::allocate(unsigned long long, void const*)]+0x142): undefined reference to
`__gnu_cxx::__7::__pool<true>::_M_reserve_block(unsigned long long, unsigned
long long)'
/home/users/pluto/tmp/ccsZppkB.o:t.cpp:(.text$_ZN9__gnu_cxx3__710__mt_allocIiNS0_20__common_pool_policyINS0_6__poolELb1EEEE10deallocateEPiy[__gnu_cxx::__7::__mt_alloc<int,
__gnu_cxx::__7::__common_pool_policy<__gnu_cxx::__7::__pool, true>
>::deallocate(int*, unsigned long long)]+0x6d): undefined reference to
`__gnu_cxx::__7::__pool<true>::_M_reclaim_block(char*, unsigned long long)'


afaics the libstdc++7.dll doesn't export e.g. _Znwy* symbols
while libstdc++-6.dll looks fine in this area:

$ 86_64-pc-mingw32-objdump -p libstdc++-6.dll|grep _Znw

        [3472] _Znwy
        [3473] _ZnwyRKSt9nothrow_t