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Undefined symbols error (Was: ocamlc vs ocamlc.opt?)
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Date: 2007-02-03 (09:13)
From: Robert Roessler <roessler@r...>
Subject: Re: [Caml-list] Undefined symbols error (Was: ocamlc vs ocamlc.opt?)
Nathaniel Gray wrote:
> On 1/31/07, Robert Roessler <roessler@rftp.com> wrote:
>> I just ran into a problem where building a bytecode executable failed
>> with findlib ("ocamlfind ocamlc ...") but the equivalent non-findlib
>> command worked.  Then I saw that I could force the same error message
>> in my non-findlib build by just matching findlib's ocamlc.opt, while I
>> had used ocamlc.
>> The command line is:
>> ocamlc -o bait -I +lablgtk2 -I +lablscintilla -thread threads.cma
>> lablgtk.cma gtkInit.cmo scintilla.cma bait.ml
>> which works fine.  Changing ocamlc to ocamlc.opt yields:
>> Error on dynamically loaded library:
>> /usr/lib/ocaml/stublibs/dlllablscintilla.so: undefined symbol:
>> caml_names_of_builtin_cprim
>> This is on FC6, with a Yum-installed OCaml 3.09.3 package.  Both of
>> the versions of the compiler identify themselves as 3.09.3 with the
>> same standard library location, and both were built on Dec 2 of 2006.
>> So should the versions of ocamlc behave the same excepting performance
>> issues, or ?
> I'm getting this error on a g++ build step:

I am more inclined to believe that there is something weird about the 
ocamlc.opt build or packaging in the FC6 Yum repo, since my problem 
clears up if I keep what I am trying to build constant and just change 
which version of the OCaml compiler I invoke.

> g++ -L/sw/lib/ -o dlllablscintilla.so  ml_scintilla.o
> liblablscintilla.a "/usr/local/godi/lib/ocaml/std-lib"/libcamlrun.a
> "/usr/local/godi/lib/ocaml/std-lib"/lablgtk2/liblablgtk2.a
> -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgdk_pixbuf-2.0 -lm
> -lpangoft2-1.0 -lpango-1.0 -lfreetype.6 -lgobject-2.0 -lgmodule-2.0
> -ldl -lglib-2.0 -lgthread-2.0
> /usr/bin/ld: Undefined symbols:
> _caml_names_of_builtin_cprim
> _caml_builtin_cprim
> It may or may not be a coincidence, but I'm trying to build your
> lablscintilla package.  This is on OS X 10.4 with godi-installed OCaml
> 3.09.3.  FWIW, these symbol references appear to come from
> libcamlrun.a.  They don't appear in libasmrun.

And libcamlrun.a is sitting right there on the command line - or at 
least an instance of this library is... OTOH, are you sure you want to 
build the DLL this way?  I build the static lib with libasmrun, but 
supply the ocamlrun lib to the DLL build.  Check the 
lib$(PACKAGE).$(A) and dll$(PACKAGE).$(SO) targets in the Makefile.

> [n8gray@golux n8gray]$ nm -a
> /usr/local/godi/lib/ocaml/std-lib/libcamlrun.a | grep builtin_cprim
>         U _caml_names_of_builtin_cprim
>         U _caml_builtin_cprim
>         U _caml_names_of_builtin_cprim
> [n8gray@golux n8gray]$ nm -a
> /usr/local/godi/lib/ocaml/std-lib/libasmrun.a | grep builtin_cprim
> Building the native-code version works fine.

So you had to build on the platform I can't test on. ;)  When you get 
something going, I would like to integrate it into my Makefile as the 
"macosx" case.

Robert Roessler