https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119376
--- Comment #19 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Andi Kleen from comment #18) > Yes the multiple passes are a problem. They also do redundant work I believe. > But it would be easier to just check opt_tailcalls I think instead of adding > a new variable. I went with a new flag because opt_tailcalls can be cleared during the pass. > >Plus, given that tail_calls pass uses a dbg_cnt and isn't done for -O0 or > >-Og, > >having musttail pass depend on just !flag_optimize_sibling_calls isn't > >correct. > > So it should be a per function flag? > > dbg_cnts are hard to handle with globals. I went with disabling cfun->has_musttail after it is handled and possibly diagnosed. Another option would be add a new PROP_* flag for that, but given that nothing uses has_musttail after the musttail pass, I think just clearing it is easier. Anyway, working now on the local vars and warnings for that.
