[Bug tree-optimization/86571] New: AIX NaNQ and NaNS output format conflicts with __builtin_sprintf

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86571

            Bug ID: 86571
           Summary: AIX NaNQ and NaNS output format conflicts with
                    __builtin_sprintf
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org
                CC: msebor at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc-ibm-aix*

AIX sprintf generates NaNQ and NaNS, probably as extensions defined by IBM XL
Fortran. The recent __builtin_sprintf optimization assumes a 3 character output
of "nan" or "NAN".  NAN(S) and NAN(Q) optionally may be allowed. IBM libc is
unlikely to change because customers depend on the current extension.