#haskell.nix on 2021-01-14

2020-09-01 01:44 angerman changed the topic of #haskell.nix to: https://input-output-hk.github.io/haskell.nix - alternative haskell infrastructure for nix; logs at https://logs.nix.samueldr.com/haskell.nix

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11:02 <Maksar> Hello everyone. I am having troubles with non-haskell dependencies in some haskell packages I'm trying to depend on. Here https://github.com/maksar/hcards/blob/master/hcards.cabal#L13 I am adding odbc library to the cabal file, but haskell.nix complains "The Nixpkgs package set does not contain the package: odbc (system dependency). You may need

11:02 <Maksar> to augment the system package mapping in haskell.nix so that it can be found." despite the https://github.com/input-output-hk/haskell.nix/blob/e6fc81b36e725312d18ff7d7e02629a22c302676/lib/pkgconf-nixpkgs-map.nix#L108 mapping. What am I missing? To reproduce – clone https://github.com/maksar/hcards and hit "nix build" command (nix flakes support

11:02 <Maksar> in needed though).

11:13 <michaelpj> Maksar: I think it might need to be in here too: https://github.com/input-output-hk/haskell.nix/blob/e6fc81b36e725312d18ff7d7e02629a22c302676/lib/system-nixpkgs-map.nix

11:14 <Maksar> ok, thanks. I'll make a clone of haskell.nix repo to confirm. Will raise a PR in case of success.

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11:44 <Maksar> Right, this works. However, compilation of the odbc itself is not successful "cbits/odbc.c:7:10: error: fatal error: 'odbcss.h' file not found". Apparently unixODBC does not provide this header. freetds does. Trying to add both `odbc = [ freetds unixODBC ];`

11:44 <Maksar> Success!

11:45 <Maksar> Should I create such PR? https://github.com/input-output-hk/haskell.nix/compare/master...maksar:odbc?expand=1

11:49 <michaelpj> Maksar: yes please! maybe include a note about why we need freetds

11:50 <michaelpj> although, whose `cbits` file is that?

11:50 <michaelpj> yours?

11:50 <michaelpj> I wonder if the cabal file there is underspecified and it should also say it needs freedts?

11:55 <michaelpj> hmm, looks like the package helps says you should install it globally

11:55 <michaelpj> weird, not sure why that wouldn't be in the cabal file

11:56 <michaelpj> so maybe it's the wrong thing to do to add this to the mapping for the `odbc` system thing, but actually it's a bug in the `odbc` haskell package

12:00 <Maksar> sure, here it is https://github.com/input-output-hk/haskell.nix/pull/997

12:02 <Maksar> well, there is a discussion with author of odbc about nix support: https://github.com/fpco/odbc/issues/14 He is not a nix user. Also, I cannot consider myself anywhere close to being a nix expert, so I could not consult him with a solution...

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