Command line flag deprecated warning could be annoying for -Werror users
In 7.10 we deprecated the poorly named
-this-package-key. However, I was working with GHC's validate script and I noticed that this behavior actually might be pretty annoying, because it causes GHC to fail on
-Werror, and there doesn't seem to be any way of turning off this behavior.
So maybe we should add a -fno-warn flag which controls flag warnings. But old GHCs wouldn't accept that flag, so it doesn't make it any more convenient for people to keep their old build scripts running while squelching the warning. Or we could drop the deprecation warning for now and start bleating about it next release.
Setting priority high because whatever we decide to do, we need to decide it before 7.10 release.