[Bug fortran/100917] Bind(c): errors handling long double real

[sandra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100917

--- Comment #8 from sandra at gcc dot gnu.org ---
There is a workaround for this included in commit

93b6b2f614eb692d1d8126ec6cb946984a9d01d7

that doesn't fully solve the problem:  when "long double" and "float128" are
different types with the same storage size (as on x86_64), it assumes that size
maps onto the standard type "long double" instead of the GNU extension type.

Tobias is presently rewriting the front-end code to build CFI descriptors
directly instead of calling a library function, so as part of that change it
should be possible to properly capture the kind of the type as well as its
size.