On:
gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0

With entt checkout:
Using v3.14.0

Compiler Error:
/entt/entity/sparse_set.hpp: In member function ‘auto entt::basic_sparse_set<Entity, >::policy_to_head() const’:
/entt/src/entt/entity/sparse_set.hpp:168:50: error: type qualifiers ignored on cast result type [-Werror=ignored-qualifiers]
168 | return static_cast<size_type>(max_size * static_cast<decltype(max_size)>(mode != deletion_policy::swap_only));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~