Re: [Haskell-cafe] Calling Haskell from C

Thanks very much - I am very ignorant in this area and all help is much appreciated. However, when I do as you suggest I get

$ otool -L a.out a.out: @rpath/Foo.dylib (compatibility version 0.0.0, current version 0.0.0) @rpath/libHSrts-ghc8.0.1.dylib (compatibility version 0.0.0, current version 0.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1226.10.1) /usr/local/lib/gcc/6/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) $ set | grep -i dyld DYLD_FALLBACK_LIBRARY_PATH=/Users/dom/Library/Haskell/ghc-8.0.1/lib/test-via-c-0.1.0.0/bin:/Library/Frameworks/GHC.framework/Versions/8.0.1-x86_64/usr/lib/ghc-8.0.1/rts ~/Dropbox/Private/TestU01-1.2.3/examples/src $ ./a.out dyld: Library not loaded: /usr/local/lib/gcc/5/libgcc_s.1.dylib Referenced from: /Library/Frameworks/GHC.framework/Versions/8.0.1-x86_64/usr/lib/ghc-8.0.1/rts/libHSrts-ghc8.0.1.dylib Reason: image not found Trace/BPT trap: 5

It’s not clear to me why it’s looking for `gcc/5` which is not installed when it looks as though it should be looking for `gcc/6`.

On 13 Jan 2017, at 16:06, Brandon Allbery wrote:

On Fri, Jan 13, 2017 at 8:53 AM, mailto:dominic@steinitz.org> wrote:

...

export DYLD_LIBRARY_PATH=/Users/dom/Library/Haskell/ghc-8.0.1/lib/test-via-c-0.1.0.0/bin:/Library/Frameworks/GHC.framework/Versions/8.0.1-x86_64/usr/lib/ghc-8.0.1/rts

That's a good way to break things. Consider DYLD_FALLBACK_LIBRARY_PATH instead. Also, use otool -l a.out to inspect the RPATH commands embedded in a.out; that will tell you where dyld searches when it sees @rpath/Foo.dylib.

-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com mailto:allbery.b@gmail.com ballbery@sinenomine.net mailto:ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net http://sinenomine.net/ Dominic Steinitz dominic@steinitz.org http://idontgetoutmuch.wordpress.com