problems building base package with --make; wired in things are assumed to not be in current package

GHC currently assumes that wired in things are not in the current package. This causes problems when the base package is partially compiled (in particular, GHC.Base is built already) and you try to build the whole thing with --make. Each time it needs something from GHC.Base, GHC looks to see if it has been loaded from another package yet and, upon finding it hasn't, loads it from the current package. This results in it loading it multiple times, giving errors like:

GHC/Foo.hs:6:6:
    Overlapping instances for Eq Bool
      arising from use of `==' at GHC/Foo.hs:6:6-17
    Matching instances:
      instance Eq Bool -- Defined in GHC.Base
      instance Eq Bool -- Defined in GHC.Base
      instance Eq Bool -- Defined in GHC.Base
    In the expression: True == True
    In the definition of `foo': foo = True == True

This is now tested by base01 in the testsuite.

Trac metadata

Trac field	Value
Version	6.4.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Operating system	Multiple
Architecture	Multiple