RE: [Caml-list] Specifying a framework to link with using ocamlopt?

[David Allsopp <dra-news@metastack.com>]

Alan Schmitt wrote:
> I'm trying to compile a simple program using glMLite, and I cannot seem
> to find a way to tell ocamlopt to use the OS X framework I specify.
> 
> If I don't say anything, I get (an expected) error:
> 
> [:)][top] % ocamlopt -I +glMLite GL.cmxa Glut.cmxa triangle.ml  -o
> triangle.exe
> ld: library not found for -lGL

I know very little about how OS X works internally (or externally, for that matter!) but presumably -lGL is not the appropriate way to link against this library on OSX given the error? This would imply, as Daniel said, that the .cmxa file has been incorrectly compiled (linker options are stored in the "manifest" of the file).

> If I try to tell the linker where the library is, I still get the same
> error:
> 
> [:(][top] % ocamlopt -cclib "-framework OpenGL" -I +glMLite GL.cmxa
> Glut.cmxa triangle.ml  -o triangle.exe
> ld: library not found for -lGL
> collect2: ld returned 1 exit status
> File "caml_startup", line 1, characters 0-1:
> Error: Error during linking
> 
> In fact, it seems the "-framework" option is simply ignored:

Not necessarily - even if "-framework OpenGL" is working then the linker must still obey "-lGL" (it can't simply ignore it). Try including -verbose in your ocamlopt switches - this will display the calls to all external programs and you'll be able to verify that "-framework OpenGL" is indeed being passed to the linker (it should be, though). 


David