[Haskell-cafe] Problems using ghc 7.8.2 with options -staticlib and -threaded on osx

Bob Ippolito bob at redivi.com
Mon Jun 9 19:49:13 UTC 2014

After patching your Xcode project file to use $(PROJECT_DIR) instead
of /Users/frode/dev/haskell/digipostarkiv I was able to build this. I
changed the "libtool command" in my lib/ghc-7.8.2/settings to a shim that
removes -lpthread and then calls /usr/bin/libtool. Not pretty but it
worked, I'm sure there's a better workaround, but I think the real solution
should be to simply special-case OSDarwin in the same way as OSiOS in GHC.

On Mon, Jun 9, 2014 at 12:33 PM, Bob Ippolito <bob at redivi.com> wrote:

> This seems like a bug, you shouldn't need to link to libpthread at all on
> Mac. /usr/lib/libpthread.dylib is just a symlink to libSystem… Not sure how
> to get around the issue without rebuilding GHC, it looks like iOS is
> special cased in the compiler (OSiOS) but not Mac OS X (OSDarwin) [1].
> [1]
> https://github.com/ghc/ghc/blob/master/compiler/main/DriverPipeline.hs#L1869-L1873
> On Mon, Jun 9, 2014 at 11:36 AM, Frode Nerbråten <frode at nerbraten.no>
> wrote:
>> Hi,
>> I'm having trouble building my Haskell library with GHC 7.8.2 and
>> Cabal on OSX 10.9.3 with both -staticlib and -threaded
>> enabled.
>> The library I'm building exports several functions using FFI to be
>> called from ObjectiveC in an Xcode project. This works fine with just
>> -staticlib enabled, but now I realize I need to call into my Haskell
>> library from multiple OS-threads simultaneously. But when I add
>> -threaded to ghc-options I get an error when linking:
>>     error: libtool: can't locate file for: -lpthread
>>     error: libtool: file: -lpthread is not an object file (not allowed
>> in a library)
>> The linker command that fails looks like this (... replaces a bunch of
>> -l and -L options):
>>     libtool -static -o liba.a dist/build/HsCocoa.o ... -lCffi -lpthread
>> In /usr/lib I have a libpthread.dylib that links to libSystem.dylib,
>> but no libpthread.a. I was under the impression that libpthread was
>> included with the system install.
>> Is this supposed to work or am I misunderstanding something basic? :)
>> Any help would be greatly appreciated!
>> The project source is available on github:
>> https://github.com/froden/digipostarkiv
>> (I asked the same question on stackoverflow:
>> http://stackoverflow.com/q/24096257/777411)
>> Best regards,
>> Frode Nerbråten
>> _______________________________________________
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>> Haskell-Cafe at haskell.org
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