ghc 6.0.1 and Mac OS X 10.2.6 build

[Sven Panne]

Alastair Reid wrote:
> Could I recommend that you use or adapt the autoconf test HUGS_TRY_DYNLINK
> (hugs98/src/unic/aclocal.m4 in the same cvs repository that has ghc).

I would recommend against this. :-)

> This test generates a C object file to be loaded then tries to load the object 
> file using one of dlopen, LoadLibrary, NSCreateObjectFileImageFromFile and 
> shl_load then tries looking up both the symbol '_test' and 'test' in the 
> file.  It sets the linker flags to use to build dynamically loadable object 
> files and whether or not to use an underscore when doing the lookup and it 
> works on HPUX, Mac, Win32 and most mainstream unix variants. (Bug reports and 
> improvements are, of course, welcome.)

Tests needing a *target* machine are bad when it comes to cross-compilation,
so we should try to avoid this for GHC. OK, GHC is not really capable of
cross-compilation yet, but we shouldn't make things worse. Regarding the
underscore story: I think I've seen similar tests in other programs (some
version of Guile?), but I can't remember. Could somebody explain in a few
sentences what exactly the "underscore problem" is in GHC(i) and/or the
libraries? Things look a bit muddled in the source code... :-]

Cheers,
    S.