[Caml-list] -custom switch useless??

[Caml-list] -custom switch useless??

[Stefano Zacchiroli]

  I'm building an ocaml package from sources and seems to me that
-custom switch on ocamlc compiler has no effect.
I'm building ocaml findlib and from the Makefile:

ocamlfind: findlib.cma $(OCAMLFIND_OBJECTS)
 $(OCAMLC) -custom -g -o ocamlfind findlib.cma unix.cma \
            $(OCAMLFIND_OBJECTS)

with -custom switch ocamlfind is linked with the interpreter and the
resulting file is a regular ELF executable that contains both the
interpreter and the bytecode.

Well, if I remove the -custom switch nothing changes!  I obtain the same
file and not a #!/usr/bin/ocamlrun executable as I expected, the two
files are identical (diff tested).

If I try the same with a stupid hello_world.ml test:

  let main () = print_string "Hello, world!\n";;
  main ();;

all work as expected (ocamlrun executable without -custom, linked
version with -custom).

Why this difference?

TIA, cheers.

-- 
Stefano "Zack" Zacchiroli <zack@cs.unibo.it> ICQ# 33538863
Home Page: http://www.students.cs.unibo.it/~zacchiro
Undergraduate student of Computer Science @ University of Bologna, Italy
                 - Information wants to be Open -
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Re: [Caml-list] -custom switch useless??

[Alain Frisch]

On Mon, 20 Aug 2001, Stefano Zacchiroli wrote:

>   I'm building an ocaml package from sources and seems to me that
> -custom switch on ocamlc compiler has no effect.

The switch tells the compiler to include a customized version of the
runtime interpreter. Some libraries requires this behaviour; this is the
case for unix.cma, because it comes with a C support library (libunix.a).
These libraries are linked with the -custom switch, and the linker
remembers it when linking your program. So -custom is implicit
in this case.

You can disable the behaviour with the -noautolink switch.
It may be useful if you want to build a custom runtime interpreter
(with unix support for instance) once and for all (-make-runtime),
and use it with -use-runtime for all your programs.


-- 
  Alain  Frisch

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