[Bug debug/120738] New: ctf: use CTF_FP_LDOUBLE encoding for 128-bit floats

[bruce.mcculloch at oracle dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120738

            Bug ID: 120738
           Summary: ctf: use CTF_FP_LDOUBLE encoding for 128-bit floats
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bruce.mcculloch at oracle dot com
  Target Milestone: ---

Currently, gen_ctf_base_type will obtain the bit_size of a given DWARF DIE
based
on the system GCC is compiling for. For DIEs with a DW_ATE_float encoding, this
is used to determine whether to classify a given DIE as a single, double, or
long double. However, on some systems, a long double will not have a bit_size
of 128 (usually it will be 80). This means that a __float128 (_Float128) type
will not be classified as a long double, and will actually be dropped entirely.