[Bug bootstrap/96568] New: Cross compiler for epiphany and arm-none cannot be built

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96568

            Bug ID: 96568
           Summary: Cross compiler for epiphany and arm-none cannot be
                    built
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---

I see the following issue:

[  269s] ../../../../../libstdc++-v3/src/c++17/fs_ops.cc: In function
'std::filesystem::path std::filesystem::read_symlink(const
std::filesystem::path&, std::error_code&)':
[  269s] ../../../../../libstdc++-v3/src/c++17/fs_ops.cc:1178:9: error:
'::lstat' has not been declared; did you mean
'std::filesystem::__gnu_posix::lstat'?
[  269s]  1178 |   if (::lstat(p.c_str(), &st))
[  269s]       |         ^~~~~
[  269s]       |         std::filesystem::__gnu_posix::lstat
[  269s] In file included from
../../../../../libstdc++-v3/src/c++17/fs_ops.cc:58,
[  269s]                  from
../../../../../libstdc++-v3/src/c++17/cow-fs_ops.cc:26:
[  269s]
../../../../../libstdc++-v3/src/c++17/../filesystem/ops-common.h:131:14: note:
'std::filesystem::__gnu_posix::lstat' declared here
[  269s]   131 |   inline int lstat(const char* path, stat_type* buffer)
[  269s]       |              ^~~~~
[  270s] ../../../../../libstdc++-v3/src/c++17/fs_ops.cc: In function
'std::filesystem::__cxx11::path std::filesystem::read_symlink(const
std::filesystem::__cxx11::path&, std::error_code&)':
[  270s] ../../../../../libstdc++-v3/src/c++17/fs_ops.cc:1178:9: error:
'::lstat' has not been declared; did you mean
'std::filesystem::__gnu_posix::lstat'?
[  270s]  1178 |   if (::lstat(p.c_str(), &st))
[  270s]       |         ^~~~~
[  270s]       |         std::filesystem::__gnu_posix::lstat
[  270s] In file included from
../../../../../libstdc++-v3/src/c++17/fs_ops.cc:58:
[  270s]
../../../../../libstdc++-v3/src/c++17/../filesystem/ops-common.h:131:14: note:
'std::filesystem::__gnu_posix::lstat' declared here
[  270s]   131 |   inline int lstat(const char* path, stat_type* buffer)
[  270s]       |              ^~~~~