Shared Library has no symbols

[W4RH4WK]

The helloworld example comes with library target which will result in a libHShelloworld_something_.so and I'd like to link this dynamic library later on with a C project.

When I build the example using cabal, the resulting library will be located somewhere inside the dist folder and contains the symbols of the exposed module.

-- src/Lib.hs

{-# LANGUAGE ForeignFunctionInterface #-}

module Lib
    ( someFunc
    ) where

someFunc :: IO ()
someFunc = putStrLn "someFunc"

foreign export ccall
    someFunc :: IO ()

$ cabal build
$ nm dist/build/libHShelloworld-1.0-ghc7.8.4.so
                 ...
                 U rts_unlock
00000000002020b8 d S1dz_srt
000000000000138d T someFunc
                 U stg_bh_upd_frame_info
00000000000013e1 t stginit_export_helloworldzm1zi0_Lib_zdfstableZZC0ZZChelloworldzzm1zzi0ZZCLibZZCsomeFunc
                 ...

But when I do the same with stack I end up with a dynamic library which does not export any symbols.

$ stack build
$ nm .stack-work/dist/x86_64-linux/Cabal-1.22.5.0/build/libHShelloworld-1.0-E7IpCWBehUOItxSp94BHC3-ghc7.10.3.so
nm: .stack-work/dist/x86_64-linux/Cabal-1.22.5.0/build/libHShelloworld-1.0-E7IpCWBehUOItxSp94BHC3-ghc7.10.3.so: no symbols

Is this a bug, or do Ijust need to supply an additional flag?

[W4RH4WK]

Related: haskell/cabal#2782