https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109642
--- Comment #14 from Marek Polacek <mpolacek at gcc dot gnu.org> --- (In reply to Miro Palmu from comment #11) > I'm not sure if this is useful information but, using span with a view in a > ranged-based for loop triggers false positive -Wdangling-referene on gcc > 14.0.1 20240117 but not on gcc 13.2. > > // On godbold: https://godbolt.org/z/x9jKh4MoW > #include <ranges> > #include <vector> > #include <span> > > int main() { > const auto vec = std::vector{ 1, 2, 3 }; > const auto s = std::span<decltype(vec)::value_type const>{vec}; > > // -Wwaring=dangling-reference on gcc 14.0.1 20240117 but not on gcc 13.2 > for ([[maybe_unused]] auto _ : s | std::views::take(2)) { } > > // No warning > for ([[maybe_unused]] auto _ : vec | std::views::take(2)) { } > > // No warning > const auto s_view = s | std::views::take(2); > for ([[maybe_unused]] auto _ : s_view) { } > } This should be fixed now. I'm going to expand Wdangling-reference17.C with this test though. Thanks.
