[Bug c++/33930] New: [4.3 regression] ambiguous overload in std::stack::push() when using --std=cxx0x

["a dot chavasse at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

g++43 -v:

Using built-in specs.Target: x86_64-unknown-linux-gnuConfigured with:
../gcc/configure --program-suffix=43 --disable-multilib
--enable-languages=c,c++Thread model: posixgcc version 4.3.0 20071028
(experimental) (GCC)

(it was built from svn trunk, revision 129693)

Not sure whether it really counts as a regression since it happens only in
c++0x experimental mode, but it does prevent code that normally compiles to
fail to do so when enabling c++0x mode, like the following snippet:

==========================
#include <stack>

void foo()
{
  std::stack< const int* > somestack;
  int* someptr = 0;
  somestack.push( someptr );
}
==========================
It fails to build with --std=cxx0x with the following error:

rvalref-overload-stdstack.cpp: In function 'void foo()':
rvalref-overload-stdstack.cpp:7: error: call of overloaded 'push(int*&)' is
ambiguous
/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../include/c++/4.3.0/bits/stl_stack.h:188:
note: candidates are: void std::stack<_Tp, _Sequence>::push(const typename
_Sequence::value_type&) [with
_Tp = const int*, _Sequence = std::deque<const int*, std::allocator<const int*>
>]
/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.3.0/../../../../include/c++/4.3.0/bits/stl_stack.h:193:
note:                 void std::stack<_Tp, _Sequence>::push(typename
_Sequence::value_type&&) [with _Tp =
 const int*, _Sequence = std::deque<const int*, std::allocator<const int*> >]


Here is a c++0x only test case not involving any headers that triggers the same
error with similar overloads:

==========================
typedef const int* type;

void foo( const type& ggg ) {}
void foo( type&& ggg ) {}

void bar( int* someptr )
{
  foo( someptr );
}
==========================


-- 
           Summary: [4.3 regression] ambiguous overload in
                    std::stack::push() when using --std=cxx0x
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: a dot chavasse at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33930