On 19/09/2012 20:01, Ian Lynagh wrote:
On Wed, Sep 19, 2012 at 07:28:23AM +0000, Simon Peyton-Jones wrote:
| > Somehow compiling DynFlags.lhs has started taking a very long time, and
| generates lots of code. I have not had time to investigate, but if anyone
has any
| idea what is happening I'd be happy to know.
|
| I've added some more stuff to it recently. In particular, a large type:
| includes/dist-derivedconstants/header/GHCConstantsHaskellType.hs
It's mostly the Read instance, but partly the Show instance, of the
type. I've attached a simple example with just a Read instance;
compiling with
ghc -O -c W2.hs
takes a while.
Instead of using Read/Show, you could generate some code in
mkDerivedConstants to use ReadP and Outputable, which should be much
smaller and faster.
Cheers,
Simon
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