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From: Tautrimas Pajarskas <tautrimas@tautrimas.lt>
Date: Tue, 9 Jun 2009 14:36:10 +0300
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Message-ID: <44e1544f0906090436l3eed359dq3740b5129c2cd6ef@mail.gmail.com>
Subject: Compiling C++ in OCaml using Swig to native code
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X-Spam: no; 0.00; ocaml:01 swig:01 ocaml:01 swig:01 bytecode:01 ocamlopt:01 ocamlopt:01 -cclib:01 cmxa:01 allocator:01 cpp:01 cmxa:01 makefile:01 byte:01 variants:01 

Hello,

I'm trying to access C++ code from OCaml using Swig. I successfully
compiled C++ code as a shared library through swig's C++ wrapper but
only in bytecode. Now, if I try the procedures listed in
http://www.linux-nantes.org/~fmonnier/OCaml/ocaml-wrapping-c.php#ref_cplusplus
for ocamlopt, I get an error:

ocamlopt -I . -cclib -lstdc++ md5wrapper.x.cmxa caller.ml -o caller.native
./libmd5wrapper.x.a(md5wrapper_wrap.o): In function
`_wrap_new_md5wrappermd5wrapper':
md5wrapper_wrap.cxx:(.text+0x147a): undefined reference to
`md5wrapper::md5wrapper()'
./libmd5wrapper.x.a(md5wrapper_wrap.o): In function
`_wrap_delete_md5wrappermd5wrapper':
md5wrapper_wrap.cxx:(.text+0x2d20): undefined reference to
`md5wrapper::~md5wrapper()'
./libmd5wrapper.x.a(md5wrapper_wrap.o): In function
`_wrap_md5wrapper_getHashFromStringmd5wrapper':
md5wrapper_wrap.cxx:(.text+0x7742): undefined reference to
`md5wrapper::getHashFromString(std::basic_string<char,
std::char_traits<char>, std::allocator<char> >)'
collect2: ld returned 1 exit status
File "caml_startup", line 1, characters 0-1:
Error: Error during linking
make: *** [caller.native] Error 2

Library consists of two files: md5wrapper.h (main interface), md5.h,
and their appropriate cpp files.
md5wrapper_wrap.cxx is the swig's generated wrapper and
md5wrapper.x.cmxa is the shared library.
caller.ml is the script for using Md5wrapper module (library?).
Here is the Makefile: http://pastebin.com/f5f55f789 (Keep in mind that
caller.byte target compiles perfectly).

I've tried all the variants I could think of. If anybody has any
experience in Swig, please help (:

--
Tautrimas Pajarskas