https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96540
--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> ---
It seems that the problem is in the declaration of the following variables in
value_range.h:
template <unsigned X> friend void gt_ggc_mx (int_range<X> *);
template <unsigned X> friend void gt_pch_nx (int_range<X> *);
template <unsigned X> friend void gt_pch_nx (int_range<X> *,
gt_pointer_operator, void *);
// ?? hash-traits.h has its own extern for these, which is causing
// them to never be picked up by the templates. For now, define
// elsewhere.
//template<unsigned X> friend void gt_ggc_mx (int_range<X> *&);
//template<unsigned X> friend void gt_pch_nx (int_range<X> *&);
This declaration is commented out, but above it is set, which looks suspicious.
If I comment out the three declarations for friend void gt_ggc_mx, then the
code seems to compile.
