ghc -odir is incompatible with .hs-boot files for hierarchical modules

Steps to reproduce

1. Adapt the example of how to compile mutually recursive modules so that the modules involved have hierarchical names:

File S/A.hs:

module S.A where
    import S.B( TB(..) )
    
    newtype TA = MkTA Int
    
    f :: TB -> TA
    f (MkTB x) = MkTA x

File S/A.hs-boot:

module S.A where
    newtype TA = MkTA Int

File S/B.hs:

module S.B where
    import {-# SOURCE #-} S.A( TA(..) )
    
    data TB = MkTB !Int
    
    g :: TA -> TB
    g (MkTA x) = MkTB x

2. Compile as the example suggests, but with -odir:

mkdir out
ghc -odir out -c S/A.hs-boot

Expected behaviour

GHC silently creates the directory out/S and then emits the file A.o-boot in that directory.

Observed behaviour

GHC produces the error message:

touch: cannot touch `out/S/A.o-boot': No such file or directory

Note: this happens with ghc --make as well.

Workaround

Create the directory out/S beforehand.

Trac metadata

Trac field	Value
Version	7.0.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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