[Haskell-cafe] Problems building lambdabot on osx

[Adam Turoff]

I've tried off and on the last couple of days to build Lambdabot on Mac OS X
(before and after the upgrade from 10.6 to 10.7) and I keep running into linker
errors with the 64-bit Haskell Platform (ghc 7.0.3).

First, there's the issue with linking against libiconv, which is solved this
way:

	cabal install --extra-lib-dirs=/usr/lib

That leaves a whole mess of link errors against libHSreadline:

	Linking dist/build/lambdabot/lambdabot ...
	ld: warning: could not create compact unwind for _ffi_call_unix64: does not use RBP or RSP based frame
	Undefined symbols for architecture x86_64:
	  "_rl_insert_completions", referenced from:
	      _readlinezm1zi0zi1zi0_SystemziConsoleziReadline_zdwa5_info in libHSreadline-1.0.1.0.a(Readline.o)
	  "_rl_possible_completions", referenced from:
	      _readlinezm1zi0zi1zi0_SystemziConsoleziReadline_zdwa7_info in libHSreadlin

(full error report at http://hpaste.org/50036 ) 

I did manage to install readline through macports:

	$ port installed readline
	The following ports are currently installed:
	  readline @6.2.000_0 (active)

	$ file /opt/local/lib/libreadline.dylib 
	/opt/local/lib/libreadline.dylib: Mach-O 64-bit dynamically linked shared library x86_64

and I did manage to get readline installed properly by specifying the
include/lib dirs from macports:

	cabal install readline --configure-option=--with-readline-libraries=/opt/local/lib --configure-option=--with-readline-includes=/opt/local/include

and readline does work in ghci:

	$ ghci
	GHCi, version 7.0.3: http://www.haskell.org/ghc/  :? for help
	Prelude> :m + System.Console.Readline
	Prelude System.Console.Readline> readline "testing> "
	testing> exit
	exit
	Just "exit"
	Prelude System.Console.Readline> 

The only issue, which has me stumped, is that lambdabot can't seem to find the
readline dependency.  Adding the --with-readline options when trying to build
lambdabot has no effect.  Neither does adding --extra-lib-dirs=/opt/local/lib
to cabal install.

Anyone have a clue where to start to work around this?  Would switching to ghc
HEAD help here?

Thanks,

-- Adam