[Bug libstdc++/86245] _GLIBCXX_LONG_DOUBLE_COMPAT GLIBCXX_3.4.21 issues

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86245

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
__gnu_cxx_ldbl128 inline namespace is not something that is necessarily to be
used by all the "g" mangled long doubles, many *LDBL_* symvers symbols are just
next to the "e" mangled ones (which are aliases to the "d" mangled ones double
in many cases).