ghc -M doesn't handle addDependentFile or #included files

ghc -M doesn't emit dependencies specified by TH's addDependentFile, not does it emit dependencies for #included files.

The former is quite hard to do, because it requires compiling the code: we only have the information about addDependentFile calls after compilation. So in order to fix this, ghc -c would have to drop some information somewhere for the build system to pick up.

In theory we should only have to preprocess files to get the list of #included files, and ghc -M already preprocesses all the files. However, currently #included files are picked up by the lexer during parsing, so fixing this isn't trivial.

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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