[Bug c++/85688] New: Unhelpful fix-it hint for __float128 when using -mno-float128

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85688

            Bug ID: 85688
           Summary: Unhelpful fix-it hint for __float128 when using
                    -mno-float128
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

g++ -c -x c++ - -mno-float128 <<< 'void f() { __float128 f = 0.0; }'
<stdin>: In function ‘void f()’:
<stdin>:1:12: error: ‘__float128’ was not declared in this scope
<stdin>:1:12: note: suggested alternative: ‘__ieee128’

It might be better to say that __float128 support has been disabled by the
-mno-float128 option, or is not supported for this target and set of options.