[Bug libstdc++/78702] [libstdc++] class __shim in locale::facet is private

["redi at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78702

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to AK from comment #0)
> In file: include/bits/locale_classes.h
> 371   class locale::facet
> 372   {
> ...
> 465     class __shim;
> 466
> 467     const facet* _M_sso_shim(const id*) const;
> 468     const facet* _M_cow_shim(const id*) const;
> 
> However in file: src/c++11/cxx11-shim_facets.cc
> numpunct_shim derives from facet::__shim which results in compilation error.

No it doesn't.

If you're using some non-default options or a non-GCC compiler to build
libstdc++ then it would be helpful to say so. Because that file builds fine
(probably due to one of GCC's bugs related to access checking in templates). 


> 227   namespace // unnamed
> 228   {
> 229     template<typename _CharT>
> 230       struct numpunct_shim : std::numpunct<_CharT>, facet::__shim
> 231       {
> 232         typedef typename numpunct<_CharT>::__cache_type __cache_type;
> 233
> 234         // f must point to a type derived from numpunct<C>[abi:other]
> 235         numpunct_shim(const facet* f, __cache_type* c = new __cache_type)
> 236         : std::numpunct<_CharT>(c), __shim(f), _M_cache(c)
> 237         {
> 238           __numpunct_fill_cache(other_abi{}, f, c);
> 239         }
> 
> 
> What could be a possible fix here?

We can build that file with -fno-access-control if needed.