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[Caml-list] A step short of -noautolink?
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Date: -- (:)
From: Jacques Garrigue <garrigue@k...>
Subject: Re: [Caml-list] A step short of -noautolink?
From: Greg Kimberly <lists@gak.com>

> I'm new to caml so apologies if this is too obvious.

This doesn't look obvious at all!

[..]
> So far, so good. Unfortunately, the default build for the examples fails 
> because the examples implicitly include pcre.cma which contains linker 
> directives which cause the /lib/libpcre.so.0 to be linked- which is the 
> wrong version. At this point I can see two possible fixes:
> 
> Upgrade the version of libpcre in /lib - not good in the general case as it 
> might cause compatiblility problems elsewhere
> 
> Use -noautolink in the example makefile to suppress the inclusion of the 
> linker directive -lpcre which has been inherited from pcre.cma
> 
> This is the solution I'm using but it seems non-optimal to throw away all 
> included linker directives just to remove one unwanted dependency. Is there 
> some better way to deal with this issue that I'm overlooking? Is there some 
> way to tell camlc to ignore a particular inherited directive from a .cma?

After some fiddling I think I have a solution to your problem.

You can change the autolink information in a .cma by relinking it,
with the -noautolink option.

If you just want to strip this information you can write:
ocamlc -a -noautolink -o mypcre.cma pcre.cma

But you can also replace it with correct information:
ocamlc -a -noautolink -o mypcre.cma pcre.cma -custom \
  -ccopt -L/usr/local/lib -cclib -lpcre_stubs -cclib -lpcre
(I'm not sure of the library name for pcre stubs)

Note that all this may be irrelevant to dynamically loaded stubs: in
that case details about where to find the C library are inside
dll???.so, and you cannot change them. However, you can change the
load path with LD_LIBRARY_PATH (the system ld.so is at work in this
case, and ocaml knows nothing about it).

Cheers,

Jacques Garrigue

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