[Bug c++/51121] New: Duplicate destructors

[db4 at mm dot st]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51121

             Bug #: 51121
           Summary: Duplicate destructors
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: db4@mm.st


g++ generates bad assembly for this code:

-------------------------------
#include <decimal/decimal>
#include <map>
#include <string>

using std::decimal::decimal32;

int
main( int, char ** )
{
    std::multimap< decimal32, std::pair< std::string, decimal32 > >  m;

    decimal32 d1;
    std::string str;
    decimal32 d2;

    m.insert( std::make_pair( d1, std::make_pair( str, d2 )));

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

Specifically, it says

$ g++ -c multimap_decimal.cpp
/tmp/cc2sQism.s: Assembler messages:
/tmp/cc2sQism.s:1690: Error: symbol `_ZNSt4pairIDfS_ISsDfEED2Ev' is already
defined

That symbol is the destructor for std::pair< decimal32, std::pair< std::string,
decimal32 > >.  It seems that g++ is instatiating a destructor for that type
and  with the first decimal32 replaced with const decimal32 and giving both the
same mangled name.  So it works if I change the m.insert() line to

    std::pair< const decimal32, std::pair< std::string, decimal32 > >
        p( d1, std::make_pair( str, d2 ));
    m.insert( p );

.ii file attached.

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.6.1/lto-wrapper
Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.1-9ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin
--enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=i686-linux-gnu
--host=i686-linux-gnu --target=i686-linux-gnu
Thread model: posix
gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)