Re: Should GHC default to -O1 ?

On 9 November 2011 13:53, Greg Weber wrote:

How much does using ghc without cabal imply a newer programmer? I don't use cabal when trying out small bits of code (maybe I should be using ghci), but am otherwise always using cabal.

The main reason cabal has always defaulted to -O is because historically it's been assumed that the user is installing something rather than just hacking on their own code. If we can distinguish cleanly in the user interface between the installing and hacking use cases then we could default to -O0 for the hacking case. Duncan

On Wed, Nov 9, 2011 at 3:18 AM, Duncan Coutts wrote:

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On 9 November 2011 00:17, Felipe Almeida Lessa wrote:

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On Tue, Nov 8, 2011 at 3:01 PM, Daniel Fischer wrote:

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On Tuesday 08 November 2011, 17:16:27, Simon Marlow wrote:

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most people know about 1, but I think 2 is probably less well-known. When in the edit-compile-debug cycle it really helps to have -O off, because your compiles will be so much quicker due to both factors 1 & 2.

Of course. So defaulting to -O1 would mean one has to specify -O0 in the .cabal or Makefile resp. on the command line during development, which certainly is an inconvenience.

AFAIK, Cabal already uses -O1 by default.

Indeed, and cabal check / hackage upload complain if you put -O{n} in your .cabal file.

The recommended method during development is to use:

$ cabal configure -O0

Duncan

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