https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82529
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2017-10-14 CC| |ebotcazou at gcc dot gnu.org Summary|Warning on unreferenced |Missing warning on |"with" is not produced |with_clause for predefined | |unit Ever confirmed|0 |1 Severity|normal |enhancement --- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- It's because Ada.Unchecked_Conversion is a predefined unit.