https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110542
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The GCC error is fixed by this change:
--- a/libstdc++-v3/include/bits/vector.tcc
+++ b/libstdc++-v3/include/bits/vector.tcc
@@ -701,6 +701,10 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
pointer __old_start = this->_M_impl._M_start;
pointer __old_finish = this->_M_impl._M_finish;
+ _Tp val;
+ if (__old_start != __old_finish)
+ val = std::move(*__old_start);
+
const size_type __len =
_M_check_len(__n, "vector::_M_default_append");
pointer __new_start(this->_M_allocate(__len));
Which makes no sense whatsoever, as it's just a redundant read from
*__old_start, which cannot change whether or not that pointer has already been
deallocated when read from again later!
So I think this part is a GCC bug.
