Am Montag, 9. Januar 2006 10:56 schrieb Axel Simon:

On Fri, 2006-01-06 at 22:37 +0100, Wolfgang Jeltsch wrote:

...

Hello again,

now that I had installed libsm-dev and libxmu-dev, building a Gears binary worked well. Since the problem didn't seem related to the GHC version, I deinstalled the GHC backports and installed GHC from sarge again which is 6.2.2.

However, with GHC 6.2.2 I got these error messages during compiling Gears.hs:

/tmp/ghc10821.hc: In function `sfcm_ret': /tmp/ghc10821.hc:1098: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `sfcf_ret': /tmp/ghc10821.hc:1216: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `sfc8_ret': /tmp/ghc10821.hc:1334: warning: assignment discards qualifiers from pointer target type /tmp/ghc10821.hc: In function `Main_info_entry': /tmp/ghc10821.hc:1443: warning: assignment discards qualifiers from pointer target type

What does this have to say?

You probably already got an answer. It's to do with const modifiers that ghc cannot produce correctly since FFI declarations do not take const modifiers. There was a discussion about this, but all solutions were too intrusive with respect to the net gain (removing some warnings).

So the warnings are harmless? But why don't they occur with GHC 6.4?

Axel.

Best wishes, Wolfgang