RE: Confusing warnings from GHC HEAD

It's a bit of a moveable feast. With -fno-spec-constr-count you allow GHC to specialise as much as it pleases, which is good for perf (maybe) but can lead to major code size expansion. S From: Johan Tibell [mailto:johan.tibell@gmail.com] Sent: 31 August 2010 10:16 To: Simon Peyton-Jones Cc: Bryan O'Sullivan; glasgow-haskell-users@haskell.org Subject: Re: Confusing warnings from GHC HEAD On Tue, Aug 31, 2010 at 11:06 AM, Simon Peyton-Jones mailto:simonpj@microsoft.com> wrote: I can't reproduce this. With the enclosed module and HEAD, I get the warning; but when I add -fspec-constr-count=5, the warning goes away and I get the specialised rules. Is this the right fix in general? I try to keep my code warning free but I don't want to bump the count unless it's always a win. If it's not always a win perhaps it should be a warning that's on by default? -- Johan