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Message-ID: <3C6FF06C.5050703@ece.gatech.edu>
Date: Sun, 17 Feb 2002 13:03:24 -0500
From: Charles Wilson <cwilson AT ece DOT gatech DOT edu>
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To: Stephano Mariani <sk DOT mail AT btinternet DOT com>
CC: cygwin AT cygwin DOT com, libtool AT gnu DOT org
Subject: Re: How do I export only specific symbols? What name should I pass to lt_dlopen?
References: <009f01c1b7b0$b367b590$01000001 AT sknet01>
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Stephano Mariani wrote:

> Hello,
> 
> I am using the current libtool with cygwin 1.3.9 (all packages up to
> date as of this morning):
> libtool             20010531a-1
> libtool-devel       20020202-1
> libtool-devel-src   20020202-1
> libtool-stable      1.4.2-2
> 
> My project has to run on windows (NT/2000/XP) and Linux (2.4.9) and
> Solaris (8).
> 
> Here is the relevant portion of the makefile Makefile.am:
> 
> [snip]
> 
> lib_LTLIBRARIES = libsk.la
> libsk_la_SOURCES = ...
> libsk_la_LDFLAGS = -no-undefined -export-dynamic -version-info 1:0:0
> -module -export-symbols sk.sym
> 


libtool uses '--export-all-symbols' in its link command, which 
apparently overrides your '-export-symbols sk.sym' option.  (BTW, 
-export-dynamic seems to have no effect in cygwin binutils.)

However, including a .def file in the list of objects to be linked will 
override '--export-all-symbols'.  I think.


> [/snip]
> 
> However, when examining the libsk.dll.a on windows, ALL the symbols are
> exported! I have yet to see if the patched libtool even works on Linux
> or Solaris.


It works on Linux, for me.

> 
> How do I specify a .def file for windows targets? The .sym seems to make
> no difference.


You need to figure out how to add the .def file to libsk_la_OBJECTS -- 
I'm not sure how to do that. As far as doing it conditionally (e.g. only 
on windows) -- first things first: figure out how to add it AT 
ALL...then worry about conditionalizing it.

--Chuck


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