If you wanted to go down that route, try using 'ghc --make -v2'
and translate that dependency graph to dot.
Also, if you want to get a quick 'n dirty list of which of your own
files depend on which others, "ghc -M $main.hs" works quite well. I've
had some success in the past shoving this stuff almost directly into
the graph libraries and out to graphviz. Be warned that it fiddles
with any file called Makefile in your working directory...
You can redirect the output of -M, but since it appears that
you cannot combine --make with -fno-code, the incantation
you want is probably something like:
ghc -M -v2 -optdep-f -optdep depend Main.hs
which gives you dependency output in two forms, a module-based
one to stdout (-v2), a file-based one to file depend (-M -f depend):
$ ghc -M -v2 -optdep-f -optdep depend TestGMap.lhs
Glasgow Haskell Compiler, Version 6.9.20080514, for Haskell 98, stage 2 booted
by GHC version 6.6.1
Using package config file: C:\ghc\ghc-6.9.20080514\package.conf
wired-in package ghc-prim mapped to ghc-prim-0.1
wired-in package integer mapped to integer-0.1
wired-in package base mapped to base-3.0
wired-in package rts mapped to rts-1.0
wired-in package haskell98 mapped to haskell98-1.0.1
wired-in package template-haskell mapped to template-haskell-2.2
wired-in package ndp not found.
Created temporary directory: C:\DOCUME~1\cr3\LOCALS~1\Temp\/ghc1564_0
*** Chasing dependencies:
Chasing modules from: TestGMap.lhs
*** Literate pre-processor:
Module dependencies
[NONREC
ModSummary {
ms_hs_date = Tue Jun 24 19:25:08 GMT Daylight Time 2008
ms_mod = main:BinTreeDatatype,
ms_imps = [Data.Generics]
ms_srcimps = []
},
NONREC
ModSummary {
ms_hs_date = Tue Jun 24 19:35:32 GMT Daylight Time 2008
ms_mod = main:GMap,
ms_imps = [Unsafe.Coerce, Data.Generics, BinTreeDatatype]
ms_srcimps = []
},
NONREC
ModSummary {
ms_hs_date = Tue Jun 24 19:24:46 GMT Daylight Time 2008
ms_mod = main:Main,
ms_imps = [GMap, BinTreeDatatype]
ms_srcimps = []
}]
*** Installing new makefile:
*** Deleting temp files:
*** Deleting temp dirs:
$ cat depend
# DO NOT DELETE: Beginning of Haskell dependencies
BinTreeDatatype.o : BinTreeDatatype.hs
GMap.o : GMap.hs
GMap.o : BinTreeDatatype.hi
TestGMap.o : TestGMap.lhs
TestGMap.o : GMap.hi
TestGMap.o : BinTreeDatatype.hi
# DO NOT DELETE: End of Haskell dependencies
Claus
http://www.haskell.org/ghc/docs/latest/html/users_guide/separate-compilation.html#makefile-dependencies
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