https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110807
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this is the same warning that causes libstdc++ testsuite failures when
testing with --target_board=unix/-D_GLIBCXX_DEBUG
FAIL: 23_containers/vector/bool/swap.cc (test for excess errors)
I thought I'd already reported that, but I can't find it.
The library allocates space for N elements then copies n elements:
vector(const vector& __x)
: _Base(_Bit_alloc_traits::_S_select_on_copy(__x._M_get_Bit_allocator()))
{
_M_initialize(__x.size());
_M_copy_aligned(__x.begin(), __x.end(), begin());
}
We probably have the usual problem that GCC thinks allocating memory might
alter __x because it's a global, and so in theory (but never in practice) the
program could replace operator new with something insane that modifies the
global.
I tried changing the constructor to:
const_iterator __xbegin = __x.begin(), __xend = __x.end();
_M_initialize(__x.size());
_M_copy_aligned(__xbegin, __xend, begin());
That fixes the library test FAILs, but not the case in this bug report.
