I guess my example was incomplete. I can make GHC run. Here's a modified version where I do have the ghc-options line. I can build an executable for the second target (myPersonalMain) by commenting the "build-depends: section" for the first target (agent). My .cabal file with (commented lines) is: ------------------------------------------------ name: agent version: 0.1.0.0 build-type: Simple cabal-version: >=1.20 ------------------------------------------------ executable agent main-is: Main.hs hs-source-dirs: ./src -- build-depends: base >=4.6 && <4.7 -- , unordered-containers >= 0.2.3.0 -- , unix >= 2.6.0.1 -- , process >= 1.1.0.2 -- , stm >= 2.4.2 -- Base language which the package is written in. default-language: Haskell2010 ---------------------------------------------- executable myPersonalMain main-is: Mpm.hs hs-source-dirs: ./src ghc-options: -main-is Mpm build-depends: base >=4.4 default-language: Haskell2010 ---------------------------------------------- The contents of Mpm.hs are: module Mpm where main = putStrLn "Hi!" But if I remove the comments in the .cabal file above, I get this: Dis-machine:cabal-tests dimitri$ cabal build myPersonalMain ./agent.cabal has been changed. Re-configuring with most recently used options. If this fails, please run configure manually. Resolving dependencies... Configuring agent-0.1.0.0... cabal: At least the following dependencies are missing: process >=1.1.0.2, stm >=2.4.2, unix >=2.6.0.1, unordered-containers >=0.2.3.0 Is this a bug? Or am I missing something? Cheers, Dimitri On 17/07/15 15:10, Imants Cekusins wrote:
this could shed some light:
http://stackoverflow.com/questions/14238729/producing-multiple-executables-f...
answer #2 was marked as answered
ghc-options: -O2 -threaded -with-rtsopts=-N -main-is FirstExecutable