Changes to make fptools insfrastructure usable for standalone libraries

[Ross Paterson]

On Sat, May 17, 2003 at 05:21:17PM +0100, Alastair Reid wrote:
>    [...]
>    When using greencard we need to know where the Foreign.GreenCard.gc
>    file was installed.  The best place seems to be in the same place that
>    Foreign.GreenCard.hi is installed.  This requires this definition:
> 
>       GHC_INSTALL_LIBDIR=`$(TOP)/find-ghc-libdir`
> 
>    where find-ghc-libdir is a cunning script from the Hopengl distribution
>   that  figures out where ghc looks for installed packages. (I think there is
>   now a cleaner way of figuring this out but can't remember it.)

How about SimonM's suggestion:
> We've solved this problem several times (GHC, hsc2hs, Happy, Alex,
> Haddock).  The solution I normally use for Unix systems is to have a  
> small script which invokes the main binary passing it a flag which
> indicates the location of its auxiliary files (usually something like
> /usr/local/lib/happy).  You can build a location-independent binary
> package which just fiddles with this script at install time.  On
> Windows, it's rather easier because a binary can get at its own
> filesystem location at runtime.

i.e. putting Foreign/GreenCard.gc and the green-card binary under
$(libdir)/gc-3.00 and making $(bindir)/green-card a small script that
runs the binary with an appropriate -i flag.  That would also avoid an
entanglement with GHC.