>> This is something Chris requested, IIRC. I'm not sure I remember the >> motivation beyond that. > > Two reasons: > > 1) -O1 doesn't actually mean anything. It is the optimization level least > understood by both the GCC folks and us. Recently (last 5 years?) there has > been a move to try to make this "optimize without messing up debug info", but > this is a new movement.
Another thing that is making -O1 better defined is asan. It is the optimization level that makes asan fast but still provides useful backtraces :-) > 2) Users who specify -O generally don't know it maps onto -O1. They almost > certainly don't want whatever -O1 provides. In my experience, most are > coming from Sun, HP or other compilers, where -O was a generally useful flag. > > 3) There are some benchmarks that pass -O (because of #2), which is > ridiculous, but reflects some reality that people use -O. I don't recall > what these benchmarks were. > > These are reasons that I suggested the change. I really don't like -O1 :-) I haven't seen -O being used in wild, so I OK with keeping it mapping to -O2. > -Chris Thanks, Rafael _______________________________________________ cfe-commits mailing list [email protected] http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
