ghc-stage1 compiles with bootstrapping ghc package, not the built one

Steps to reproduce: Build GHC using 7.10 as the bootstrapping compiler. Now check which GHC package stage 1 Main.hi was linked against, e.g. using --show-iface:

[ezyang@hs01 ghc-validate2]$ ../ghc-7.10/inplace/bin/ghc-stage2 --show-iface ghc/stage1/build/Main.hi
...
package dependencies: array-0.5.0.1 base-4.8.0.0 binary-0.7.2.3
                      bin-package-db-0.0.0.0 bytestring-0.10.6.0 containers-0.5.6.2
                      deepseq-1.4.0.0 directory-1.2.1.1 filepath-1.3.1.0
                      ghc-7.10.0.20141223 ghc-prim-0.3.1.0 hoopl-3.10.0.2 hpc-0.6.0.2
                      integer-gmp-1.0.0.0 process-1.2.1.0 time-1.5.0.1
                      transformers-0.4.2.0 unix-2.7.1.0

Bad news!

I think I introduced bug when I made GHC a wired in package: consequently when we ask GHC to link against a specific version of the GHC package, this flag is ignored. I don't actually know what the right way to fix this is, but we'll have to figure something out here.

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Build System
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