https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70813
John David Anglin <danglin at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2020-02-09 CC| |danglin at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #2 from John David Anglin <danglin at gcc dot gnu.org> --- I observe the same warning. Whether the '0' flag is ignored or not in this situation is an issue for mpfr since r13457. HP-UX treats this situation differently from glibc. HP-UX ignores the flag and glibc doesn't.