Re-compiling wired-in packages

[Joachim Breitner]

Hi,

Am Dienstag, den 25.04.2017, 19:30 +0800 schrieb Shao Cheng:
> > I did just that recently, see
> > https://github.com/nomeata/veggies
> > for how I did it, in particular boot.sh.
> 
> Thank you for your work! I looked at boot.sh, and tried the "ghc
> Setup.hs && ./Cabal" approach. It works for ghc-prim & integer-
> simple, but not base. Since porting gmp to my target platform is
> hard, I chose integer-simple, and "./Cabal build" produces the
> following error message for base:
> 
> Preprocessing library for base-4.10.0.0..
> Building library for base-4.10.0.0..
> [  1 of 238] Compiling GHC.IO[boot]     ( GHC/IO.hs-boot,
> dist/build/GHC/IO.o-boot )
> [  2 of 238] Compiling GHC.Stack.Types  ( GHC/Stack/Types.hs,
> dist/build/GHC/Stack/Types.o )
> 
> GHC/Stack/Types.hs:57:1: error:
>     Bad interface file: /home/shaocheng/hana/lib/x86_64-linux-ghc-
> 8.3.20170423/integer-simple-0.1.1.1-
> FieYyHVQ4yaKr3TU2vSN3a/GHC/Integer.hi
>         Something is amiss; requested module  integer-simple-
> 0.1.1.1:GHC.Integer differs from name found in the interface file
> integer-simple:GHC.Integer (if these names look the same, try again
> with -dppr-debug)
>    |
> 57 | import GHC.Integer ()
>    | ^^^^^^^^^^^^^^^^^^^^^
> 
> The compilation for integer-simple didn't produce error, and it is
> properly registered by ghc-pkg, so I've no idea why there's a bad
> interface file. Do you have any ideas on possible causes? Thanks a
> lot.

In short: ghc (the library) will insist on using integer-gmp resp.
integer-simple as configured at _build time_ of GHC. So if you want to
use integer-simple, you need to build your own GHC with 

INTEGER_LIBRARY=integer-simple

set in mk/build.mk

Also see https://ghc.haskell.org/trac/ghc/ticket/13477

Greetings,
Joachim


-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
  XMPP: nomeata at joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org
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