#1386: foreign exports not taken into account when calculating -fwarn-unused-
imports
-----------------------+----------------------------------------------------
Reporter: duncan | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.7
Severity: normal | Keywords:
Difficulty: Unknown | Os: Unknown
Testcase: | Architecture: Unknown
-----------------------+----------------------------------------------------
Here we have a program that imports and uses {{{liftM}}} from
{{{Control.Monad}}}, but only as a result of being used in the definition
of a function that is foreign exported.
{{{
module Foo () where
import Control.Monad (liftM)
foo :: IO ()
foo = id `liftM` return ()
foreign export ccall "hs_foo"
foo :: IO ()
}}}
GHC 6.6 and HEAD report:
{{{
foo.hs:3:0:
Warning: Module `Control.Monad' is imported, but nothing from it is
used,
except perhaps instances visible in `Control.Monad'
To suppress this warning, use: import Control.Monad()
}}}
So I suppose all that needs to happen is to add in foreign exports as
roots when building the usage graph.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1386>
GHC <http://www.haskell.org/ghc/>
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