Re: [Haskell-cafe] Time Typeable Instances
On Tue, 2009-10-13 at 08:48 -0500, John Goerzen wrote: Now I'm getting complaints from people using 6.10.4 saying that there are now missing instances of Typeable with time 1.1.2.4. Right, because 1.1.2.4 is an earlier version than 1.1.3 which is the random intermediate snapshot version included in the ghc-6.10.3 extralibs collection and the version where the Typable instances were added. So the problem you're noticing is that some people are using 1.1.2.4 and others are using 1.1.3 or 1.1.4 and these are not related to the version of ghc that they are using, so using the ghc version as a proxy fails. 1) Did the Typeable instances get dropped again from time? No. 2) What exactly should I do so this library compiles on GHC 6.8 and 6.10.x? Depend on the time library and use one of the following techniques: If you're prepared to depend on Cabal-1.6 then you can use the cpp macros that let you do conditional compilation on the version of a package you depend on. You mention that the time only incremented the 4th digit when it added the instances but I don't think that's right. My time-1.1.2.4 has no Typeable instances but 1.1.4 does (and I believe 1.1.3 did too). So you should be able to use this mechanism. Alternatively you can use the flag hack in the .cabal file: flag annoying-time-instances library ... if flag(annoying-time-instances) build-depends: time = 1.1.3 else build-depends: time 1.1.3 cpp-options: -DUSE_OWN_TIME_TYPABLE_INSTANCES so it appears that what's happening here is that GHC 6.10.3 extralibs included time 1.1.3, but then haskell-platform standardized on 1.1.2.4. This is pretty annoying -- that haskell-platform would standardize on a version older than what shipped with a GHC release -- but I guess I can work around it by restricting my build-dep to be time 1.1.3 and re-adding the instances. No, it's the haskell-platform that was and is doing the right thing and it is ghc that subsequently accidentally shipped a random development snapshot. The platform has a commitment to provide API compatible versions of packages within a major series. The first release of the platform used time-1.1.2.4 (along with ghc-6.10.2) and thus it could not include the time-1.1.3 that the subsequent release of ghc-6.10.3 accidentally included. Duncan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Time Typeable Instances
Hi John, I just stumbled on this issue while trying to compile turbinado with the haskell platform / ghc 6.10.4. I got past it by manually editing back in the time definitions, but just wondering if there was an official resolution. Thanks, Warren On Oct 13, 2009, at 6:48 AM, John Goerzen wrote: Hugo Gomes wrote: The Glorious Glasgow Haskell Compilation System, version 6.10.4 with old-time-1.0.0.2 and time-1.1.2.4 This is a standard haskell platform on a windows xp. Cabal install didn't work complaining about missing instances of typeable for posix time and other datatypes, yet, after removing the macros (thus, adding those instances), hdbc and convertible compiled and installed fine. Removing the macros might be a bit overkill, probably finetuning them so that they add only the necessary instances for typeable in ghc 610 might be a better solution. I'm going to CC haskell-cafe on this because I am confused. Hugo, can you confirm what version of convertible you have? Back on May 21, I started a thread [1] on haskell-cafe complaining that GHC 6.10.3 included a newer time that included instances of Typeable for NominalDiffTime and UTCTime. This broke my code, which had manually defined instances for these types, as they were needed. Things got complicated, as only time's minor version number got incremented (x.x.x.Y) [2]. Cabal can't test against that version number. I wanted my code to work with old and new versions of GHC. Since testing against the version of time was impossible, I did the next best thing: tested against the version of GHC. #if __GLASGOW_HASKELL__ = 610 -- instances added in GHC 6.10.3 #else instance Typeable NominalDiffTime where typeOf _ = mkTypeName NominalDiffTime instance Typeable UTCTime where typeOf _ = mkTypeName UTCTime #endif Also, in the .cabal, there is a build-depends on time=1.1.2.4. Now, that would break for GHC 6.10.1 and 6.10.2 users, but will work for 6.10.3 and above, or 6.8 and below. Or so I thought. Now I'm getting complaints from people using 6.10.4 saying that there are now missing instances of Typeable with time 1.1.2.4. 1) Did the Typeable instances get dropped again from time? 2) What exactly should I do so this library compiles on GHC 6.8 and 6.10.x? I'm looking at the darcs repo for time and don't see the instances ever getting dropped. [1] http://osdir.com/ml/haskell-cafe@haskell.org/2009-05/msg00982.html [2] http://osdir.com/ml/haskell-cafe@haskell.org/2009-05/msg00985.html later addendum so it appears that what's happening here is that GHC 6.10.3 extralibs included time 1.1.3, but then haskell-platform standardized on 1.1.2.4. This is pretty annoying -- that haskell-platform would standardize on a version older than what shipped with a GHC release -- but I guess I can work around it by restricting my build-dep to be time 1.1.3 and re-adding the instances. Does this sound right? On Tue, Oct 13, 2009 at 2:51 AM, John Goerzen jgoer...@complete.org mailto:jgoer...@complete.org wrote: Hugo Gomes wrote: Hi, convertible and hdbc packages fail to compile in my standard instalation of the haskell platform. I think this has to do with those if ghc = 610 macros on the typeable instances for some datatypes. I removed them and now they work fine... What version of GHC and time do you have? -- John ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Time Typeable Instances
Hugo Gomes wrote: The Glorious Glasgow Haskell Compilation System, version 6.10.4 with old-time-1.0.0.2 and time-1.1.2.4 This is a standard haskell platform on a windows xp. Cabal install didn't work complaining about missing instances of typeable for posix time and other datatypes, yet, after removing the macros (thus, adding those instances), hdbc and convertible compiled and installed fine. Removing the macros might be a bit overkill, probably finetuning them so that they add only the necessary instances for typeable in ghc 610 might be a better solution. I'm going to CC haskell-cafe on this because I am confused. Hugo, can you confirm what version of convertible you have? Back on May 21, I started a thread [1] on haskell-cafe complaining that GHC 6.10.3 included a newer time that included instances of Typeable for NominalDiffTime and UTCTime. This broke my code, which had manually defined instances for these types, as they were needed. Things got complicated, as only time's minor version number got incremented (x.x.x.Y) [2]. Cabal can't test against that version number. I wanted my code to work with old and new versions of GHC. Since testing against the version of time was impossible, I did the next best thing: tested against the version of GHC. #if __GLASGOW_HASKELL__ = 610 -- instances added in GHC 6.10.3 #else instance Typeable NominalDiffTime where typeOf _ = mkTypeName NominalDiffTime instance Typeable UTCTime where typeOf _ = mkTypeName UTCTime #endif Also, in the .cabal, there is a build-depends on time=1.1.2.4. Now, that would break for GHC 6.10.1 and 6.10.2 users, but will work for 6.10.3 and above, or 6.8 and below. Or so I thought. Now I'm getting complaints from people using 6.10.4 saying that there are now missing instances of Typeable with time 1.1.2.4. 1) Did the Typeable instances get dropped again from time? 2) What exactly should I do so this library compiles on GHC 6.8 and 6.10.x? I'm looking at the darcs repo for time and don't see the instances ever getting dropped. [1] http://osdir.com/ml/haskell-cafe@haskell.org/2009-05/msg00982.html [2] http://osdir.com/ml/haskell-cafe@haskell.org/2009-05/msg00985.html later addendum so it appears that what's happening here is that GHC 6.10.3 extralibs included time 1.1.3, but then haskell-platform standardized on 1.1.2.4. This is pretty annoying -- that haskell-platform would standardize on a version older than what shipped with a GHC release -- but I guess I can work around it by restricting my build-dep to be time 1.1.3 and re-adding the instances. Does this sound right? On Tue, Oct 13, 2009 at 2:51 AM, John Goerzen jgoer...@complete.org mailto:jgoer...@complete.org wrote: Hugo Gomes wrote: Hi, convertible and hdbc packages fail to compile in my standard instalation of the haskell platform. I think this has to do with those if ghc = 610 macros on the typeable instances for some datatypes. I removed them and now they work fine... What version of GHC and time do you have? -- John ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
