[Caml-list] Question in Linking C and Ocaml

[Caml-list] Question in Linking C and Ocaml

[Jung Woon Ho]

Hi,
Im trying to link some Ocaml files to my C program. And I'm having 
difficulties in liking them together.
here is what I do....

1)  compile all my Ocaml src code with the following command.
ocamlopt -c -output-obj  <filenames>
2) compile my C file using GCC (obtain object files)
3) compile my C file that calls the OCAML function with ocamlc -c (obtain 
object files)
     ar -rv sched.a mod.a and all the object files produced above. (obtain 
sched.a)
4) ranlib sched.a
5) finally in the main Makefile when I try to link the sched.a (produced 
above) using
g++ -L/usr/include -O3 -DHAVE_CONFIG_H  myfiles.o sched/sched.a -lncurses 
-lm -ldl

Gives me the following errors:

sched/sched.a(modwrap.o)(.text+0x27): In function `fib':
: undefined reference to `caml_named_value'
sched/sched.a(modwrap.o)(.text+0x42): In function `fib':
: undefined reference to `copy_string'
sched/sched.a(modwrap.o)(.text+0x53): In function `fib':
: undefined reference to `callback'
sched/sched.a(modwrap.o)(.text+0x88): In function `format_result':
: undefined reference to `caml_named_value'
sched/sched.a(modwrap.o)(.text+0xab): In function `format_result':
: undefined reference to `callback'
collect2: ld returned 1 exit status

I tried different variations of what I explainded above and I cant get it to 
link together.
Can somebody help me with this?

This is my second day stuck with this problem, any kind of help will be 
greatly apreciated.
thank you very much.

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Re: [Caml-list] Question in Linking C and Ocaml

[Brian Hurt]

On Wed, 2 Jul 2003, Jung Woon Ho wrote:

> Hi,
> Im trying to link some Ocaml files to my C program. And I'm having 
> difficulties in liking them together.
> here is what I do....
> 
> 1)  compile all my Ocaml src code with the following command.
> ocamlopt -c -output-obj  <filenames>

Is there a reason you're producing C code here?  I've had good results 
just doing:

1) Use ocamlopt -c on ocaml files to produce .cm[oi] files (note: no 
-output-obj here).
2) Use gcc -c on C files to produce .o files
3) Use ocamlopt to link .cmo and .o files.

> Gives me the following errors:
> 
> sched/sched.a(modwrap.o)(.text+0x27): In function `fib':
> : undefined reference to `caml_named_value'
> sched/sched.a(modwrap.o)(.text+0x42): In function `fib':
> : undefined reference to `copy_string'

It looks like you might need to link in some Ocaml-specific libraries.  

Brian


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