[PATCH] Fix vector::_Temporary_value::_M_ptr

[Jonathan Wakely]

The pointer argument to allocator_traits::construct and
allocator_traits::destroy should be a raw pointer, not the allocator's
pointer type. _Temporary_value::_M_ptr was returning the wrong type.

        * include/bits/stl_vector.h (vector::_Temporary_value::_M_ptr):
        Return raw pointer not allocator's pointer type.
        (vector::_Temporary_value::_M_val): Use _M_ptr.

Tested x86_64-lixnu, committed to trunk.


commit 5368f71250324a046e5f026fef33a3e12176c243
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Mon Sep 3 15:01:32 2018 +0100

    Fix vector::_Temporary_value::_M_ptr
    
    The pointer argument to allocator_traits::construct and
    allocator_traits::destroy should be a raw pointer, not the allocator's
    pointer type. _Temporary_value::_M_ptr was returning the wrong type.
    
            * include/bits/stl_vector.h (vector::_Temporary_value::_M_ptr):
            Return raw pointer not allocator's pointer type.
            (vector::_Temporary_value::_M_val): Use _M_ptr.

diff --git a/libstdc++-v3/include/bits/stl_vector.h 
b/libstdc++-v3/include/bits/stl_vector.h
index 6bb75b7f8fd..47856473107 100644
--- a/libstdc++-v3/include/bits/stl_vector.h
+++ b/libstdc++-v3/include/bits/stl_vector.h
@@ -1667,11 +1667,11 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
        { _Alloc_traits::destroy(_M_this->_M_impl, _M_ptr()); }
 
        value_type&
-       _M_val() { return *reinterpret_cast<_Tp*>(&__buf); }
+       _M_val() { return *_M_ptr(); }
 
       private:
-       pointer
-       _M_ptr() { return pointer_traits<pointer>::pointer_to(_M_val()); }
+       _Tp*
+       _M_ptr() { return reinterpret_cast<_Tp*>(&__buf); }
 
        vector* _M_this;
        typename aligned_storage<sizeof(_Tp), alignof(_Tp)>::type __buf;