This constructor needs to cast a pointer to uninitialized
memory to a pointer to object type in order to call
allocator_traits::construct(). This cast is not allowed when CFI cast
checks are enabled.
I did this instead of marking __addr() as _LIBCPP_NO_CFI so that we
don't lose CFI checks on get() or the dtor.
Differential Revision: https://reviews.llvm.org/D50743
llvm-svn: 339797
_Tp & get() { return *__addr(); }
template<class... _Args>
- __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc)
- { _Traits::construct(__a, __addr(), _VSTD::forward<_Args>(__args)...); }
+ _LIBCPP_NO_CFI
+ __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) {
+ _Traits::construct(__a, reinterpret_cast<_Tp*>(addressof(__v)),
+ _VSTD::forward<_Args>(__args)...);
+ }
~__temp_value() { _Traits::destroy(__a, __addr()); }
};