[Bug c++/124394] New: [reflection] same extern "C" functions in different namespaces

[leni536 at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124394

            Bug ID: 124394
           Summary: [reflection] same extern "C" functions in different
                    namespaces
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: leni536 at gmail dot com
  Target Milestone: ---

version: g++
(Compiler-Explorer-Build-gcc-e0d9c5a23fff9002b6f971ee868bd05d7fa1e6ef-binutils-2.44)
16.0.1 20260306 (experimental)
flags: -std=c++26 -O3 -freflection

Consider:

#include <meta>

extern "C" {
    namespace N1 {
        void f();
    }
    namespace N2 {
        void f();
    }
}
using N1::f;
using N2::f;

static_assert(^^N1::f == ^^N2::f); // error: static assertion failed

https://godbolt.org/z/4qoxoo4de

I expect the static assertion to pass, as the compared reflections represent
the same function.

https://eel.is/c++draft/expr.eq#6.4