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Presicions on executable generation from caml: does ocamlopt -outpput-obj generates a main function ?
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Date: -- (:)
From: EL CHAAR Rabih SGAM/AI/SAM <RABIH.ELCHAAR@s...>
Subject: Presicions on executable generation from caml: does ocamlopt -outpput-obj generates a main function ?
Hello everyone,

I want to have some precisions concerning executable generation from an
ml file.

I am a bit accustomed with the ocamlc code generation.

 

The ml is compiled into a .cmo.

A C file is generated, embedding the cmo into a byte array which will be
passed to the function caml_startup

 

The main() function just calls the caml_startup() (or caml_main()).

 

 

My question is relevant to the ocamlopt generator.

When doing a -verbose, we see that there is no C file generated. The
.cmx is translated into assembly .asm, that in turn using ml.exe is
converted it into a .obj.

I don't know if in this case there is a main function which is defined
(inside the resulting .obj).

 

I am trying to build an executable which links to a library needing f2c
libs, libF77 and libI77. The first one needs to have a main function
defined.

 

When compiling with ocamlc, everything works fine, but switching to
ocamlopt yields the error message

 

libF77.lib(main.obj) : error LNK2019: unresolved external symbol _MAIN__
referenced in function _main

 

Thanks in advance for your help.

Any pointers to ocamlopt executable generation are welcome.

 

Rabih

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