https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81811
Eric Gallager <egallager at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization --- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> --- (In reply to Martin Sebor from comment #3) > (In reply to Richard Biener from comment #2) > > Wonder whether the memcpy case is because we fold the memcpy away as both > > memcpy and strcpy are marked RET1 (returns arg1). > > The memcpy is eliminated in DSE and turned into a plain 'return a' statement > that the find_explicit_erroneous_behavior() in tree-ssa-isolate-paths.c > that implements the warning knows how to handle. > > DSE doesn't handle strcpy or strncpy so the calls are not eliminated and > because find_explicit_erroneous_behavior() doesn't handle calls, the 'return > strcpy(a, s)' statement isn't detected. > > This suggests an opportunity to improve not just the warning but also DSE. so, sounds like a missed-optimization too, then