The development version of cabal has support for building dynamic objects. See:
https://github.com/haskell/cabal/blob/master/Cabal/doc/developing-packages.r...
On 13 January 2017 at 10:59, Dominic Steinitz
I've been trying to get the example in https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ffi-chap.htm... working.
I have a cabal file
name: test-via-c version: 0.1.0.0 homepage: TBD license: MIT author: Dominic Steinitz maintainer: idontgetoutmuch@gmail.com category: System build-type: Simple cabal-version: >=1.10
executable Foo.dylib main-is: Foo.hs other-extensions: ForeignFunctionInterface build-depends: base >=4.7 && <4.10, primitive >=0.6 && <0.7 hs-source-dirs: src default-language: Haskell2010 include-dirs: src ghc-options: -O2 -shared -fPIC -dynamic extra-libraries: HSrts-ghc8.0.1
which installs
/Users/dom/Library/Haskell/ghc-8.0.1/lib/test-via-c-0.1.0.0/bin/Foo.dylib
I then compile the C with
gcc-6 Bar.c /Users/dom/Library/Haskell/ghc-8.0.1/lib/test-via-c-0.1.0.0/bin/Foo.dylib -I/Library/Frameworks/GHC.framework/Versions/8.0.1-x86_64/usr/lib/ghc-8.0.1/include -L/Library/Frameworks/GHC.framework/Versions/8.0.1-x86_64/usr/lib/ghc-8.0.1/rts -lHSrts-ghc8.0.1
Sadly when I try to run the executable I get
~/Dropbox/Private/TestU01-1.2.3/examples/src $ ./a.out dyld: Library not loaded: @rpath/Foo.dylib Referenced from: /Users/dom/Dropbox/Private/TestU01-1.2.3/examples/src/./a.out Reason: image not found Trace/BPT trap: 5
I am guessing the executable is looking for the dynamic library. I copied Foo.dylib to the current directory but still get the same error.
I know this is really an OS X question but I am hoping someone who has done before will be able to help.
Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.wordpress.com
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