Talkative Join points warning

[Luke Maurer]

Agreed! Filed this one as bug #13221 yesterday:

https://ghc.haskell.org/trac/ghc/ticket/13221

I'll have a look right now, in case it's an easy fix.

- Luke

On 02/02/2017 03:37 PM, Simon Peyton Jones wrote:
> Better still, figure out why it's happening and stop it happening.  It shouldn't!
>
> S
>
> | -----Original Message-----
> | From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Ben
> | Gamari
> | Sent: 02 February 2017 21:36
> | To: Luke Maurer <maurerl at cs.uoregon.edu>
> | Cc: ghc-devs at haskell.org
> | Subject: Talkative Join points warning
> |
> |
> | Hi Luke,
> |
> | I've noticed that a new WARN in OccurAnal seems to be quite loud.
> | Validations now produce thousands of lines of the form,
> |
> |     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
> |       OccurAnal failed to rediscover join point(s): [$j_shTG]
> |     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
> |       OccurAnal failed to rediscover join point(s): [$w$j_sl22]
> |     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
> |       OccurAnal failed to rediscover join point(s): [$w$j_sl1W]
> |     WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
> |       OccurAnal failed to rediscover join point(s): [$w$j_sl1Q]
> |
> | Do you think we could either quiet the warning down a bit or perhaps
> | disable it by default? It makes it rather difficult to see through the
> | noise.
> |
> | This is actually perhaps another case where Simon Marlow suggestion of
> | introducing a family of -v* flags (e.g. -fvanishing-join-points) might be
> | helpful.
> |
> | Cheers,
> |
> | - Ben
>