Merge _stub.o files back in to the .o file

GHC sometimes generates _stub.o files. When it does, ghci doesn't work with compiled files (it forgets to include the _stub.o in the files to link against), and it complicates many building rules (including those inside GHC's makefile).

It would be far better if the _stub.o files were merged back in with the original. This is actually reasonably easy:

b <- doesFileExist stub
when b $ do
    let tmp = res <.> "tmp.o"
    mv obj tmp
    exec ["ld","-r","-o",obj,tmp,stub]
    rm stub
    rm tmp

While being mainly a feature request, this enhancement also fixes a bug with GHCi loading files with _stub's, so includes a bug fix for free.

Trac metadata

Trac field	Value
Version	6.10.4
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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