[Bug libstdc++/85818] [8/9 Regression] undefined reference to `std::experimental::filesystem::v1::__cxx11::path::preferred_separator'

[sudi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85818

sudi at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sudi at gcc dot gnu.org

--- Comment #4 from sudi at gcc dot gnu.org ---
I have observed the following failures on baremetals aarch64-none-elf,
aarch64_be-none-elf and arm-none-eabi nightly tests for both trunk and gcc-8
branch.

FAIL: experimental/filesystem/path/preferred_separator.cc (test for excess
errors)

with

compilation terminated.

compiler exited with status 1
output is:
/build/src/gcc/libstdc++-v3/testsuite/experimental/filesystem/path/preferred_separator.cc:21:
fatal error: experimental/filesystem: No such file or directory

compilation terminated.