Re-compiling wired-in packages

[Shao Cheng]

Hi,

> 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.

Greetings,
Shao Cheng
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