Re: [Caml-list] Embedding Ocaml in a windows application

[Leonardo Laguna <modlfo@gmail.com>]

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I have given up on compiling the msvc port. I don't know why I'm getting
errors when the '.exe' is not there.

I will try to explain better what I want to do.

I have the following files:

- plug.lib (provided by the software vendor, closed source, compiled with
VC++), in OSX I have plug.a
- my_main.c (the code for the plugin)
- ocaml_stub.c (this code calls 'caml_startup()')
- ocaml_code.ml

in OSX I compile my_main.c, ocaml_stub.c and ocaml_code.ml to obtain '.o'
files. Then I link the .o files with plug.a and libasmrun.a. This works
fine.

In windows I have wodi32, visual studio 2008 and Flexdll. I tried the
following.
- Using cl compile, ocaml_stub.c, my_main.c to obtain '.obj' files
- Using ocamlopt, compile ocaml_code.ml to obtain a '.o' file
- Using flexlink to link the .obj, .o, libasmrun.a, plug.lib, libgcc.a and
libc.a

This gives me an error:

** Cannot resolve symbols for libasmrun.a(floats.o):
 ___strtod

I have tried to create my own strtod function and link it does not pick it.

Anybody knows how can I link my program.

Thanks.

Leonardo





On Fri, May 9, 2014 at 2:13 PM, Adrien Nader <adrien@notk.org> wrote:

> Hi,
>
> On Fri, May 09, 2014, Leonardo Laguna wrote:
> > Hello,
> >
> > I’m trying to make a plugin for a third party application using Ocaml.
>  This
> > plugin is a shared library that is usually written in C, so you take
> your C
> > code and link it with a static library (provided by the software vendor)
> in
> > order to get a shared library that can be loaded by the application.  I
> made a
> > small test in OSX that embeds Ocaml  (as shown in ‘Interoperability with
> C’ of
> > the book ‘Developing applications with Objective Caml’) and works fine.
> > However in windows I’m running into problems.
> >
> > The shared library that the vendor provides is compiler with VC++,
> therefore
> > is not possible to link object files produced by the Cygwin neither MinGW
> > port. For that reason I tried to compile the MSVC port of Ocaml and I
> didn’t
> > succeed.
>
> Depends: if the library is C then you can perfectly mix the two
> compilers. Keep in mind that when you build with GCC on Windows, you're
> still using the Windows libraries like msvcrt.dll or kernel32.dll and
> they've been built using MSVC.
>
> > I followed the instructions in the README.win32. The first problem I had
> was
> > that flexlink was not able to call ‘link’, so I downloaded the flexlink
> code
> > and changed it to call instead ‘link.exe’, this worked. Then flexlink
> could
> > not handle Cygwin paths like ‘/tmp/’or ‘/cygdrive/c/’ . I modified the
> code so
> > it replaces the Cygwin paths to Windows paths. It worked. I continued
> until I
> > got the message that the ‘ml’ command does not exist. The environment is
> set
> > correctly and I can call ‘ml’ from the terminal.
> >
> > Has anyone tried to compile the MSVC port lately?
>
> IIRC even the MSVC port is built from Cygwin and I think it won't mind
> whether there are trailing '.exe' or not.
> But now I'm not sure I understand: what is calling flexlink? Is it your
> build system or the ocaml compiler's?
>
> --
> Adrien Nader
>

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